A synergistic adjuvant for improving the control effect of red spider mites, a preparation method and application thereof

Abstract

The present application relates to a kind of synergistic adjuvant for improving the prevention and treatment effect of red spider and its preparation method and application, the dosage form of the adjuvant is emulsifiable concentrate, the adjuvant includes the following mass content components: eggshell breaking agent 1.0-50.0%, penetrant 10.0-50.0% and emulsifier 5.0-20.0%, solvent is supplemented to 100.0%;The eggshell breaking agent is the mixture of one or two of ethylenediamine oleate and C13 isopropyl alcohol amide in any ratio;The penetrant is alpha-terpineol;The solvent is the mixture of one or two of 4-isopropyltoluene and ethanol in any ratio.Compared with prior art, the present application can improve the physicochemical properties of pesticide solution, reduce the surface tension of pesticide, improve the penetration and spreading property and leaf retention of pesticide, the eggshell breaking agent has good wax dissolving and dewaxing performance, effectively improves the prevention and treatment effect of pesticide on red spider mite and egg.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide adjuvants, and relates to a synergistic adjuvant for improving the control effect of red spider mites, and a preparation method and application thereof. Background Art

[0002] Citrus spider mites have a varied diet, a wide host range, strong reproductive capacity, rapid development, and a short lifespan, producing multiple generations annually. The widespread use of herbicides has damaged the microecological environment in orchards, limiting the reproduction and predation of their natural enemies. Furthermore, the extensive use of pesticides, such as insecticides, while killing pests, also harms their natural enemies. This creates a shortage of spider mites further down the food chain, leading to outbreaks. Furthermore, the long-term use of a single pesticide has led to increasing resistance in spider mites, further complicating their control.

[0003] Red spider mites are small and secretive, making it difficult to fully cover them when applying pesticides, and they are prone to rebounding after the effect of the pesticide wears off. The red spider's back hair is waterproof, so the pesticide must be in full contact with the spider's body surface after spraying to achieve a good control effect. The mainstream acaricides currently on the market include avermectin, etoxazole, bifenazate, fluazinam, spirocyclopentyl, and pyridaben. In recent years, there have been few new and excellent acaricide varieties. Due to their long-term use, red spiders in many areas have developed resistance to these agents. In addition, the formulations of these agents are basically suspension concentrates. Due to the characteristics of the suspension formulation itself, it is difficult to add more synergistic adjuvants, so the control effect is not fully exerted. The actual utilization rate of the pesticides in the field is low, especially for high-content acaricide suspension products.

[0004] There are numerous varieties of acaricide synergists on the market, but their quality varies greatly, each with its own advantages and disadvantages. While mainstream silicone synergists offer significant effectiveness against red spider mites, poor dosage control can easily result in the surface tension of the solution falling below 25 mN / m. The critical surface tension on the front of citrus leaves is 33.59 mN / m, and on the back of citrus leaves it is 32.78 mN / m. When the surface tension is too low, the agent easily slides off the leaf surface, reducing its utilization and significantly compromising its effectiveness. Sodium dioctyl sulfosuccinate has a significant penetrating synergistic effect, but its practical use is unsafe and can easily cause phytotoxicity. Nonylphenol polyoxyethylene ethers NP-7 and NP-10 have significant synergistic effects against acaricides, but their use is not recommended due to their high environmental reproductive toxicity. Mineral oil and D-limonene are effective acaricides, but as registered pesticides, they cannot be sold and used alone as synergists.

[0005] Patent CN115299461A discloses a composition containing an oil-copper-manganese package and an ethyl ester polyene fish oil adjuvant, and its application. The composition includes the oil-copper-manganese package and the ethyl ester polyene fish oil adjuvant; the oil-copper-manganese package contains mineral oil, copper oxychloride, and mancozeb; the ethyl ester polyene fish oil adjuvant contains an effective active ingredient, which includes ethyl ester polyene fish oil. However, the patent covers a relatively broad range of ethyl ester polyene fish oils, without specifying their specific ingredients. This makes it difficult to determine the raw material procurement source in actual applications, hinders quality control, and makes it difficult to ensure the effectiveness of the application. Furthermore, the ethyl ester polyene fish oil is primarily targeted at mancozeb, copper oxychloride, and mineral oil, and the scope of other agents with synergistic effects is unclear.

[0006] Patent CN105076130A discloses a composite emulsifier for pesticide emulsifiable concentrates, which is composed of sodium dodecylbenzenesulfonate (500#) and phenethylphenol polyoxyethylene ether (601#), with a weight ratio of 1:(3-4). However, the calcium dodecylbenzenesulfonate (500#) of the patent is an anionic emulsifier, and the phenethylphenol polyoxyethylene ether (601#) is a nonionic emulsifier. Both have only an emulsifying function and are substantially free of wetting and penetrating properties. The patent is inconsistent with the actual physical and chemical properties of the two. Moreover, the patent only describes a composite emulsifier for avermectin emulsifiable concentrate, and does not involve its scope of application and use effect. Summary of the Invention

[0007] The purpose of the present invention is to overcome at least one of the defects of the above-mentioned prior art and provide a synergistic adjuvant and its preparation method and application for improving the control effect of red spider mites. The present invention can improve the physical and chemical properties of the liquid medicine, reduce the surface tension of the agent, and improve the penetration and spreadability of the agent and the leaf retention. The egg shell breaker has good wax dissolving and wax removal properties, effectively improving the control effect of pesticides on red spider mites and eggs.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] One of the technical solutions of the present invention is to provide a synergistic adjuvant for improving the control effect of red spider mites. The adjuvant is in the form of an emulsifiable concentrate. The adjuvant contains the following components by weight: 1.0-50.0% of an eggshell breaker, 10.0-50.0% of a penetrant, and 5.0-20.0% of an emulsifier, with the solvent added to 100.0%.

[0010] As a preferred technical solution, the auxiliary agent comprises the following components by mass: 10.0-30.0% of eggshell breaker, 20.0-40.0% of penetrant and 10.0-20.0% of emulsifier, and the solvent is supplemented to 100.0%.

[0011] Furthermore, the eggshell breaker is one or a mixture of any proportion of ethylenediamine oleate and C13 isopropanolamide.

[0012] As a preferred technical solution, the eggshell breaker is one or a mixture of any proportion of ethylenediamine oleate EDO-86 and C13 isopropyl alcohol amide DF-21.

[0013] As a preferred technical solution, the eggshell breaker is a mixture of ethylenediamine oleate EDO-86 and C13 isopropanolamide DF-21, and the mass ratio of ethylenediamine oleate EDO-86 to C13 isopropanolamide DF-21 is (1:10)-(10:1).

[0014] Furthermore, the penetrant is α-terpineol.

[0015] Furthermore, the emulsifier is one or a mixture of any of the following in any proportions: calcium dodecylbenzenesulfonate, phenethylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether and EO-PO block copolymer.

[0016] As a preferred technical solution, the emulsifier is one or a mixture of any of the following in any proportions: calcium dodecylbenzenesulfonate, phenethylphenol polyoxyethylene ether 601#, 602#, fatty alcohol polyoxyethylene ether AEO-5, AEO-7, AEO-9 and EO-PO block copolymer Ethylan 992, Ethylan NS-500LQ.

[0017] Furthermore, the solvent is one of 4-isopropyltoluene and ethanol or a mixture of the two in any proportion.

[0018] As a preferred technical solution, 4-isopropyltoluene is a necessary fixed component in the solvent, and the mass ratio of the ethanol used to the total amount of the auxiliary agent is 0-10%.

[0019] The present invention provides a synergistic adjuvant for improving the control effect of red spider mites, which has significant synergistic effect and high safety. This is mainly due to:

[0020] (1) The eggshell breaker is a mixture of ethylenediamine oleate EDO-86 and C13 isopropanolamide DF-21. On the one hand, the eggshell breaker can enter the red spider egg through the respiratory pores, fertilization holes, or through the protective layer of the egg shell, dissolving the wax inside the egg and penetrating into the yolk membrane, causing the egg to be poisoned, embryonic development to stop, and death; for adult mites, it can quickly dissolve the waxy hydrophobic layer on the surface of the adult mite, increasing the probability of the agent contacting and entering the adult mite body; on the other hand, the eggshell breaker has excellent wax dissolving and wax removal properties. When the liquid medicine is sprayed on the leaves, it can quickly penetrate the wax layer of the leaves, promote the absorption of the medicine, and improve the utilization rate of the medicine. In addition, in addition to having excellent wax dissolving and wax removal properties, ethylenediamine oleate EDO-86 and C13 isopropanolamide DF-21 also have good wetting, emulsification, and penetration properties.

[0021] (2) α-Terpineol itself has good wetting, penetration and adhesion capabilities. Currently, it is mainly used in agriculture to enhance the killing of fruit and vegetable pathogens. There are no reports on its use in the prevention and control of citrus red spider mites. After testing, the surface tension of a 1% α-terpineol aqueous solution (25°C) is only 33.6 mN / m, which shows that it has an excellent ability to reduce surface tension. The critical surface tension value of the front side of citrus leaves is 33.59 mN / m, and the critical surface tension value of the back side of citrus leaves is 32.78 mN / m. When the surface tension of the liquid medicine is closer to the critical surface tension of the target leaves, its wetting and spreading properties are better, the proportion of liquid medicine rebounding and sliding off the leaves when spraying is lower, and the utilization rate of the medicine is higher. α-Terpineol exists in many natural plants, so it also has good biocompatibility and high safety.

[0022] (3) Field trials have shown that 4-isopropyltoluene has a certain killing effect on citrus red spider mites. A 10% 4-isopropyltoluene emulsifiable concentrate diluted 250 times showed an 85.63% control effect on citrus red spider mites 15 days after application, indicating excellent control efficacy. In the synergistic adjuvant of the present invention, 4-isopropyltoluene not only has its own control effect but also acts as a solvent dilution agent. 4-isopropyltoluene is an aromatic monoterpene that exists in many essential oils in nature. Therefore, it also has good biocompatibility and high safety.

[0023] (4) In addition to the emulsifying properties, the fatty alcohol polyoxyethylene ethers AEO-5, AEO-7, AEO-9 and EO-PO block copolymers Ethylan 992 and Ethylan NS-500LQ selected by the present invention have good wetting and penetration properties, which also play a good auxiliary role in improving the wetting and penetration properties of the agent.

[0024] One of the technical solutions of the present invention is to provide a method for preparing a synergistic adjuvant for improving the control effect of red spider mites, the method comprising the following steps:

[0025] (1) Add the eggshell breaker, penetrant and solvent into the reactor in order according to the formula ratio, start stirring and continue stirring;

[0026] (2) Add the measured emulsifier and continue stirring. After testing and packaging, the synergistic additive is obtained.

[0027] Furthermore, the stirring time in steps (1) and (2) is 10-30 min.

[0028] One of the technical solutions of the present invention is to provide an application of a synergistic adjuvant for improving the control effect of red spider mites. The adjuvant is used to control citrus red spider mites. The adjuvant is added to the spray barrel in a tank mix with a miticide before spraying and mixed evenly.

[0029] Furthermore, the acaricide is selected from one or more of abamectin, etoxazole, bifenazate, fluazinam, spirocyclopent, fenpyrad, pyridaben, hexythiazolin, clofentezine, propargyl, cypermethrin, fenbutatin, tebufenpyrad, spirotetramat, cypermethrin and ethoxyfenpyrad.

[0030] Furthermore, the mass ratio of the adjuvant to the acaricide is (50:1)-(1:50), and the spraying time is 12-24 hours.

[0031] As a preferred technical solution, the mass ratio of the auxiliary agent to the acaricide is (10:1)-(1:20).

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] (1) The present invention can improve the physical and chemical properties of the liquid medicine, reduce the surface tension of the medicine, increase the penetration and spreadability of the medicine and the amount of leaf retention. The egg shell breaker has good wax dissolving and wax removal properties, effectively improving the control effect of the pesticide on red spider mites and eggs;

[0034] (2) The present invention can be used in a tank mix with acaricides, which can significantly improve the control effect of the agents on red spider mites, has good safety, and enriches the selection of varieties of acaricide synergistic adjuvants. DETAILED DESCRIPTION

[0035] The present invention is described in detail below with reference to specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0036] Unless otherwise specified, the equipment used in the following examples are all conventional equipment in the art; the reagents used are all commercially available products or prepared by conventional methods in the art unless otherwise specified. Anything not described in detail in the following examples can be achieved by conventional experimental means in the art.

[0037] In the examples, unless otherwise specified, all percentages are by mass and all contents are expressed in wt.%.

[0038] Example 1:

[0039] The invention discloses a synergistic adjuvant for improving the control effect of red spider mites. The formulation is an emulsifiable concentrate. The components and the mass percentages of the components are as follows: 5.0% of ethylenediamine oleate EDO-86, 5.0% of C13 isopropanolamide DF-21, 40.0% of α-terpineol, 6.2% of calcium dodecylbenzenesulfonate, 2.9% of phenylethylphenol polyoxyethylene ether 601#, and 2.9% of fatty alcohol polyoxyethylene ether AEO-9. 4-isopropyltoluene is added to make up to 100.0%.

[0040] A method for preparing a synergistic adjuvant for improving the control effect of red spider mites, the method specifically comprises the following steps:

[0041] (1) Add the eggshell breaker (ethylenediamine oleate EDO-86 and C13 isopropanolamide DF-21), penetrant (α-terpineol) and solvent (4-isopropyltoluene) into the reactor in sequence according to the formula ratio, start stirring and continue stirring for 10 minutes;

[0042] (2) Add measured emulsifiers (calcium dodecylbenzenesulfonate, phenethylphenol polyoxyethylene ether 601# and fatty alcohol polyoxyethylene ether AEO-9), continue stirring for 20 minutes, and obtain the synergistic additive after testing and packaging.

[0043] Example 2:

[0044] A synergistic adjuvant for improving the control effect of red spider mites and a preparation method thereof are basically the same as Example 1, except that the components and the mass percentages of the components are: 8.0% of ethylenediamine oleate EDO-86, 7.0% of C13 isopropanolamide DF-21, 30.0% of α-terpineol, 7.0% of calcium dodecylbenzenesulfonate, 4.0% of phenethylphenol polyoxyethylene ether 602#, 4.0% of fatty alcohol polyoxyethylene ether AEO-5, and 2.0% of anhydrous ethanol, with 4-isopropyltoluene making up to 100.0%.

[0045] Example 3:

[0046] A synergistic adjuvant for improving the control effect of red spider mites and a preparation method thereof are basically the same as Example 1, except that the components and the mass percentages of the components are: 8.0% of ethylenediamine oleate EDO-86, 14.0% of C13 isopropanolamide DF-2, 20.0% of α-terpineol, 5.0% of calcium dodecylbenzenesulfonate, 5.0% of fatty alcohol polyoxyethylene ether AEO-7, and 4.0% of anhydrous ethanol, and 4-isopropyltoluene is added to 100.0%.

[0047] Comparative Example 1:

[0048] A synergistic adjuvant and its preparation method are substantially the same as those of Example 2, except that ethylenediamine oleate EDO-86 and C13 isopropyl alcohol amide DF-21 are replaced by equal amounts of water.

[0049] Comparative Example 2:

[0050] A synergistic adjuvant and its preparation method are substantially the same as those of Example 2, except that a-terpineol is replaced by equal amounts of water.

[0051] Comparative Example 3:

[0052] A synergistic adjuvant and its preparation method are substantially the same as those of Example 2, except that 4-isopropyl toluene is replaced by equal amounts of xylene.

[0053] Application of a synergistic adjuvant, the synergistic adjuvant prepared in Examples 1 to 3 and Comparative Examples 1 to 3 is added to the spray tank in the form of tank mixing with the pesticide, and after mixing evenly, it is all sprayed within 24 hours.

[0054] The pesticide is 40% bifenthrin·ethomexazole suspension concentrate (25%+15%), and the field preparation dosage is diluted 8000 times. The adjuvant addition amount is 2:1 in mass ratio with 40% bifenthrin·ethomexazole suspension concentrate, i.e. diluted 4000 times. The blank control group is not treated with pesticide solution, and an equal amount of water is sprayed.

[0055] A synergistic adjuvant is tested for prevention and control, citrus orchards with red spider mites are selected, and pesticide application is carried out during the peak period of red spider mite damage in April and May. Before pesticide application, the insect population base is investigated, and after pesticide application, the investigation is carried out once a day, 3 days and 15 days. Each plot is investigated for 3 trees, and the fixed-point investigation is carried out, 2 leaves are investigated in each direction, the leaves are directly observed with a hand magnifying glass, and the number of live mites on the front and back of the leaves is counted. A total of 30 leaves in each plot are investigated. The mite reduction rate and control effect are calculated, as shown in Table 1.

[0056] Mite reduction rate (%) = (pre-treatment mite number - post-treatment mite number) ÷ pre-treatment mite number × 100

[0057] Control effect (%) = (treatment area mite reduction rate - blank control area mite reduction rate) ÷ (100 - blank control area mite reduction rate) × 100

[0058] Table 1 Test results of Examples 1 to 3 and Comparative Examples 1 to 3

[0059]

[0060] As shown in Table 1, the addition of the adjuvants in this example significantly enhanced the pesticide's effectiveness against red spider mites. Compared to treatments without adjuvants, this example significantly improved the pesticide's effectiveness against citrus red spider mites through the synergistic effect of the specific eggshell breaker, penetrant, and solvent. Furthermore, the adjuvant was safe for citrus trees during the trial, with no pesticide damage observed after application.

[0061] 15 days after application, the control effects of Examples 1 to 3 on citrus red spider mites were all above 95%, which were more significant than those of Comparative Examples 1 to 3, indicating that the eggshell breaker, penetrant and solvent in the present examples had a good synergistic effect.

[0062] A retention test of a synergistic adjuvant was conducted. The adjuvants prepared in Example 2 and Comparative Examples 1 to 3 were tested for surface tension, penetration time, and maximum retention of the liquid on leaves. The adjuvants were diluted with deionized water to form aqueous solutions of different concentrations. The surface tension was measured using a surface tension meter, and the penetration time was measured using a standard canvas sheet. The maximum retention of the liquid was determined as follows:

[0063] Dilute the sample by the appropriate multiple, then use a 5 cm hole punch to punch out fresh cabbage leaves (disks), weigh them (W0, 0.00001 g), hold the leaves vertically with tweezers, and immerse them in the prepared sample solution for 5 seconds. Quickly pull the leaves out of the water, hold them vertically for approximately 5 seconds, and weigh them when no more droplets flow (W1). Calculate the maximum retention, as shown in Table 2.

[0064] Maximum retention (R, mg / cm 2 )=(W1-W0)÷S

[0065] Note: S is the disc blade area.

[0066] The blank control group was deionized water.

[0067] Table 2 Control test results of Example 2 and Comparative Examples 1 to 3

[0068]

[0069] As shown in Table 2, under the synergistic effect of the eggshell breaker, penetrant, and solvent, this embodiment has good wetting and penetrating properties, can significantly reduce the surface tension of the liquid medicine, and increase the amount of liquid medicine retained on the leaves, thereby improving the control effect on red spider mites.

[0070] Example 4:

[0071] A synergistic adjuvant for improving the control effect of red spider mites is basically the same as Example 1, except that the components and the mass percentages of the components are: 13.0% of ethylenediamine oleate EDO-86, 5.0% of C13 isopropanolamide DF-21, 25.0% of α-terpineol, 8.0% of calcium dodecylbenzenesulfonate, 4.0% of fatty alcohol polyoxyethylene ether AEO-9, 4.0% of EO-PO block copolymer Ethylan 992, and 5.0% of anhydrous ethanol, with 4-isopropyltoluene supplemented to 100.0%.

[0072] Example 5:

[0073] A synergistic adjuvant for improving the control effect of red spider mites is basically the same as Example 1, except that the components and the mass percentages of the components are: 15.0% of ethylenediamine oleate EDO-86, 10.0% of C13 isopropanolamide DF-21, 30.0% of α-terpineol, 6.0% of calcium dodecylbenzenesulfonate, 4.0% of fatty alcohol polyoxyethylene ether AEO-5, 3.0% of EO-PO block copolymer Ethylan NS-500LQ, and 8.0% of anhydrous ethanol, with 4-isopropyltoluene added to 100.0%.

[0074] Example 6:

[0075] A synergistic adjuvant for improving the control effect of red spider mites is basically the same as Example 1, except that the components and the mass percentages of the components are: 8.0% of ethylenediamine oleate EDO-86, 12.0% of C13 isopropanolamide DF-21, 20.0% of α-terpineol, 4.0% of calcium dodecylbenzenesulfonate, 8.0% of fatty alcohol polyoxyethylene ether AEO-7, 2.0% of EO-PO block copolymer Ethylan NS-500LQ, and 10.0% of anhydrous ethanol, with 4-isopropyltoluene added to 100.0%.

[0076] Comparative Example 4:

[0077] A synergist and a preparation method thereof are substantially the same as those in Example 5, except that ethylenediamine oleate EDO-86 and C13 isopropanolamide DF-21 are replaced by an equal amount of water.

[0078] Comparative Example 5:

[0079] A synergist and a preparation method thereof are substantially the same as those in Example 5, except that α-terpineol is replaced by an equal amount of water.

[0080] Comparative Example 6:

[0081] A synergist and a preparation method thereof are substantially the same as those in Example 5, except that 4-isopropyltoluene is replaced by an equal amount of trimethylbenzene.

[0082] An application of a synergistic adjuvant is to add the synergistic adjuvant prepared in Examples 4 to 6 and Comparative Examples 4 to 6 and the agent into a spray barrel in a barrel-mixed form, mix them evenly, and spray all of them within 24 hours.

[0083] The agent was a 23% avermectin-etoxazole suspension concentrate (3% + 20%), diluted 2000-fold for field preparation. The adjuvant was added at a 1:1 mass ratio to the 23% avermectin-etoxazole suspension concentrate, resulting in a 2000-fold dilution. A blank control group was not treated with the agent and was sprayed with an equal amount of water.

[0084] The control test of a synergistic adjuvant was the same as that of Examples 1 to 3 and Comparative Examples 1 to 3. The insect population reduction rate and control effect were calculated as shown in Table 3.

[0085] Table 3 Control test results of Examples 4 to 6 and Comparative Examples 4 to 6

[0086]

[0087] As shown in Table 3, the addition of the pesticide in this example significantly enhanced the control efficacy of the pesticide against red spider mites. Compared to treatments without adjuvants, the synergistic effect of the specific eggshell breaker, penetrant, and solvent in this example significantly improved the control efficacy of the pesticide against citrus red spider mites. Furthermore, the pesticide was safe for citrus trees during the trial, with no phytotoxicity observed after application.

[0088] 15 days after application, the control effects of Examples 4 to 6 on citrus red spider mites were all above 95%, which were more significant than those of Comparative Examples 4 to 6, indicating that the eggshell breaker, penetrant and solvent in the present examples had a good synergistic effect.

[0089] A retention test for the synergistic adjuvant was conducted. Surface tension, penetration time, and maximum leaf retention of the adjuvants prepared in Example 5 and Comparative Examples 4 to 6 were tested, similar to those in Example 2 and Comparative Examples 1 to 3. The maximum retention was calculated, as shown in Table 4.

[0090] Table 4 Control test results of Example 5 and Comparative Examples 4 to 6

[0091]

[0092] As shown in Table 4, under the synergistic effect of the eggshell breaker, penetrant, and solvent, this embodiment has good wetting and penetrating properties, can significantly reduce the surface tension of the liquid medicine, and increase the amount of liquid medicine retained on the leaves, thereby improving the control effect on red spider mites.

[0093] Example 7:

[0094] A synergistic adjuvant for improving the control effect of red spider mites is basically the same as Example 1, except that the components and the mass percentages of the components are: ethylenediamine oleate EDO-86 7.0%, C13 isopropanolamide DF-213.0%, α-terpineol 35.0%, calcium dodecylbenzenesulfonate 8.0%, phenethylphenol polyoxyethylene ether 601# 6.0% and EO-PO block copolymer Ethylan NS-500LQ 2.0%, and 4-isopropyltoluene is supplemented to 100.0%.

[0095] Example 8:

[0096] A synergistic adjuvant for improving the control effect of red spider mites is basically the same as Example 1, except that the components and the mass percentages of the components are: 12.0% of ethylenediamine oleate EDO-86, 4.0% of C13 isopropanolamide DF-21, 40.0% of α-terpineol, 8.0% of calcium dodecylbenzenesulfonate, 6.0% of phenethylphenol polyoxyethylene ether 602#, 4.0% of EO-PO block copolymer Ethylan 992, and 6.0% of anhydrous ethanol, with 4-isopropyltoluene added to 100.0%.

[0097] Example 9:

[0098] A synergistic adjuvant for improving the control effect of red spider mites is basically the same as Example 1, except that the components and the mass percentages of the components are: 20.0% of ethylenediamine oleate EDO-86, 10.0% of C13 isopropanolamide DF-21, 20.0% of α-terpineol, 6.0% of calcium dodecylbenzenesulfonate, 4.0% of EO-PO block copolymer Ethylan NS-500LQ and 10.0% of anhydrous ethanol, and 4-isopropyltoluene is added to 100.0%.

[0099] Comparative Example 7:

[0100] A synergist and a preparation method thereof are substantially the same as those in Example 8, except that ethylenediamine oleate EDO-86 and C13 isopropanolamide DF-21 are replaced by an equal amount of water.

[0101] Comparative Example 8:

[0102] A synergistic aid and a preparation method thereof are basically the same as those in Example 8, except that α-terpineol is replaced by an equal amount of water.

[0103] Comparative Example 9:

[0104] A synergistic agent and a preparation method thereof are basically the same as those in Example 8, except that 4-isopropyltoluene is replaced by an equal amount of solvent oil S-200.

[0105] An application of a synergistic adjuvant is to add the synergistic adjuvant prepared in Examples 7 to 9 and Comparative Examples 7 to 9 and the agent into a spray barrel in a barrel-mixed form, mix them evenly, and spray all of them within 24 hours.

[0106] The agent was 500g / L fluazinam suspension concentrate (40%), diluted 1500-fold for field preparation. The mass ratio of adjuvant to 500g / L fluazinam suspension concentrate was 1:2, resulting in a 3000-fold dilution. A blank control group was not treated with the agent and was sprayed with an equal amount of water.

[0107] The control test of a synergistic adjuvant was the same as that of Examples 1 to 3 and Comparative Examples 1 to 3. The insect population reduction rate and control effect were calculated as shown in Table 5.

[0108] Table 5 Control test results of Examples 7 to 9 and Comparative Examples 7 to 9

[0109]

[0110] As shown in Table 5, the addition of the pesticide in this example significantly enhanced the control efficacy of the pesticide against red spider mites. Compared to treatments without adjuvants, the synergistic effect of the specific eggshell breaker, penetrant, and solvent in this example significantly improved the control efficacy of the pesticide against citrus red spider mites. Furthermore, the pesticide was safe for citrus trees during the trial, with no observed phytotoxicity after application.

[0111] 15 days after application, the control effects of Examples 7 to 9 on citrus red spider mites were all above 95%, which were more significant than those of Comparative Examples 7 to 9, indicating that the eggshell breaker, penetrant and solvent in the present examples had a good synergistic effect.

[0112] A retention test for the synergistic adjuvant was conducted. Surface tension, penetration time, and maximum leaf retention of the adjuvants prepared in Example 8 and Comparative Examples 7 to 9 were tested, similar to those in Example 2 and Comparative Examples 1 to 3. The maximum retention was calculated, as shown in Table 6.

[0113] Table 6 Control test results of Example 8 and Comparative Examples 7 to 9

[0114]

[0115] As shown in Table 6, under the synergistic effect of the eggshell breaker, penetrant, and solvent, this embodiment has good wetting and penetrating properties, can significantly reduce the surface tension of the liquid medicine, and increase the amount of liquid medicine retained on the leaves, thereby improving the control effect on red spider mites.

[0116] In summary, this embodiment can improve the physical and chemical properties of the liquid medicine, reduce the surface tension of the medicine, increase the penetration and spread of the medicine and the leaf retention amount. The egg shell breaker has good wax dissolving and wax removal properties, which effectively improves the control effect of pesticides on red spider mites and eggs.

[0117] Examples 1 to 3, Examples 4 to 6, and Examples 7 to 9 illustrate the synergistic effect of different agents (40% bifenazate·etoxazole suspension, 23% avermectin·etoxazole suspension, and 500 g / L fluazinam suspension), indicating that the synergistic adjuvants in this embodiment have a synergistic effect on the agents of this embodiment within the scope of protection.

[0118] This embodiment is used in a tank mix with acaricides (40% bifenazate·etoxazole suspension, 23% avermectin·etoxazole suspension and 500g / L fluazinam suspension), which can significantly improve the control effect of the agent on red spider mites, has good safety, and enriches the selection of acaricide synergistic adjuvants.

[0119] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A synergistic adjuvant for improving the control effect of red spider mites, characterized in that: The adjuvant is in the form of emulsifiable concentrate, and the adjuvant comprises the following components by weight: 1.0-50.0% of an eggshell breaker, 10.0-50.0% of a penetrant, and 5.0-20.0% of an emulsifier, with the solvent added to 100.0%; The eggshell breaker is a mixture of ethylenediamine oleate and C13 isopropanolamide, and the mass ratio of ethylenediamine oleate to C13 isopropanolamide is (1:10)-(10:1); The penetrant is α-terpineol; The solvent is 4-isopropyltoluene, or a mixture of 4-isopropyltoluene and ethanol in any proportion, and 4-isopropyltoluene is a necessary fixed component.

2. A synergistic adjuvant for improving the control effect of red spider mites according to claim 1, characterized in that: The emulsifier is one of calcium dodecylbenzenesulfonate, phenethylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether and EO-PO block copolymer, or a mixture of any of the above in any proportion.

3. A method for preparing a synergistic adjuvant for improving the control effect of red spider mites according to claim 1 or 2, characterized in that: The method comprises the following steps: (1) Add the eggshell breaker, penetrant and solvent into the reactor in sequence and continue stirring; (2) Add emulsifier and continue stirring to obtain auxiliary agent.

4. The method for preparing a synergistic agent for improving the control effect of red spider mites according to claim 3, characterized in that: The stirring time in steps (1) and (2) is 10-30 min.

5. A use of the synergistic adjuvant for improving the control effect of red spider mites as claimed in claim 1 or 2, characterized in that: The adjuvant is used for preventing and controlling citrus red spider mites. The adjuvant is mixed with the acaricide in a tank mix before spraying.

6. The use of a synergistic adjuvant for improving the control effect of red spider mites according to claim 5, characterized in that: The acaricide is selected from one or more of abamectin, etoxazole, bifenazate, fluazinam, spirocyclopent, fenpyrad, pyridaben, hexythiazolin, clofentezine, propargyl, cypermethrin, fenbutatin, tebufenpyrad, spirotetramat, cypermethrin and ethoxyfenpyrad.

7. The use of a synergistic adjuvant for improving the control effect of red spider mites according to claim 5, characterized in that: The mass ratio of the adjuvant to the acaricide is (50:1)-(1:50), and the spraying time is 12-24 hours.

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