Insecticidal composition for preventing and treating citrus scale insects

Abstract

The invention belongs to the technical field of insecticides, and particularly relates to an insecticidal composition for preventing and treating citrus scale insects, a specific preparation method of the insecticidal composition for preventing and treating citrus scale insects comprises the following steps: selecting raw materials: taking thiamethoxam, afidopyropen, spirotetramat, a solvent, an emulsifier, a penetrant, a synergist, a stabilizer and water; the preparation method comprises the steps that four containers are taken and marked as the first container, the second container, the third container and the fourth container respectively, 28 parts of thiamethoxam and 1 part of afidopyropen are added into the first container respectively, 47 parts of thiamethoxam and 10 parts of afidopyropen are added into the second container respectively, the preparation process is simple, raw materials are cheap and easy to obtain, and therefore the production cost can be greatly reduced; the thiamethoxam, the afidopyropen and the spirotetramat are mutually combined to prepare four insecticides, and the insecticides have a good killing effect on citrus scale insects and can take effect in a short time, so that the maximum insecticidal rate is achieved.

Description

Technical Field

[0001] This invention relates to the field of insecticide technology, specifically to an insecticidal composition for controlling citrus scale insects. Background Technology

[0002] Citrus scale insects are a common and serious pest in citrus production. They belong to the superfamily Scale Superfamily of the order Hemiptera and include many species, such as the red wax scale, cottony cushion scale, arrowhead scale, and chaff scale. They use their piercing-sucking mouthparts to feed on the sap of citrus leaves, branches, and fruits, significantly impacting citrus growth, yield, and quality.

[0003] Adults and nymphs congregate on the surface of leaves, branches, and fruits, sucking sap, causing leaves to yellow, curl, and fall off; branches to grow weakly and dry out; and fruits to develop spots and depressions, resulting in reduced quality and even fruit drop. Some species (such as the cottony cushion scale) secrete large amounts of honeydew, which can induce sooty mold, covering leaves and fruits and affecting photosynthesis and fruit appearance.

[0004] To effectively control citrus scale insects, insecticidal compositions are currently used to kill them. However, existing insecticidal compositions still have the following technical problems when used:

[0005] Existing insecticidal compositions are not very effective against citrus scale insects and cannot eliminate them in a short period of time. Furthermore, the preparation process is complex and the processing cost is high.

[0006] Therefore, an insecticidal composition for controlling citrus scale insects is proposed to address the aforementioned problems. Summary of the Invention

[0007] The purpose of this invention is to provide an insecticidal composition for controlling citrus scale insects, thereby solving the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an insecticidal composition for controlling citrus scale insects, and the specific preparation method of the insecticidal composition for controlling citrus scale insects is as follows:

[0009] Step 1: Select raw materials: Take thiamethoxam, diclofenac, spirotetramat, solvent, emulsifier, penetrant, synergist, stabilizer and water;

[0010] Step 2, Preparation: Take four containers and label them as Container 1, Container 2, Container 3, and Container 4. Add 28 parts of thiamethoxam and 1 part of bipromethrin to Container 1, 47 parts of thiamethoxam and 10 parts of bipromethrin to Container 2, 9 parts of spirotetramat and 1 part of bipromethrin to Container 3, and 33 parts of spirotetramat and 10 parts of bipromethrin to Container 4. Mix the four containers together.

[0011] Solvents were added to four containers in sequence, heated to 40-50°C, and continuously mixed and stirred with a stirring device at a speed of 300-500 r / min for 8-10 minutes. Then emulsifiers, penetrants, synergists and stabilizers were added and mixed for another 10-12 minutes to obtain an oil phase system.

[0012] Step 3, Testing and Adjustment: Pour the sample into a graduated cylinder, dilute with water, and observe whether there is layering or precipitation. If instability occurs, add an appropriate amount of emulsifier to adjust. Determine the actual content of thiamethoxam, bifenthrin, and spirotetramat by liquid chromatography to ensure that it meets the requirements. Finally, obtain an insecticidal composition with a concentration of 10%-15%.

[0013] Step 4: Dispensing: Inject the prepared insecticidal composition into packaging bottles and store it away from light.

[0014] Preferably, in step three, the solvent used is xylene, the emulsifier is calcium dodecylbenzenesulfonate, the penetrant is polyether-modified trisiloxane, the synergist is piperonyl butyl ether, and the stabilizer is di-tert-butyl-p-cresol.

[0015] Preferably, the No. 1 container contains 15-20 parts solvent, 8-12 parts emulsifier, 3-5 parts penetrant, 2-3 parts synergist, 1.5-2.5 parts stabilizer, and 50-53 parts water.

[0016] Preferably, the second container contains 161-256 parts solvent, 57-85.5 parts emulsifier, 19-28.5 parts penetrant, 3.8-5.7 parts synergist, 3.8-5.7 parts stabilizer, and 128-220 parts water.

[0017] Preferably, in the No. 3 container, 35-40 parts solvent, 10-14 parts emulsifier, 5-7 parts penetrant, 1-2 parts synergist, 1-2 parts stabilizer and 10-12 parts water need to be added respectively.

[0018] Preferably, in container No. 4, 137-138 parts of solvent, 41-42 parts of emulsifier, 17-18 parts of penetrant, 6-7 parts of synergist, 5-6 parts of stabilizer and 92-93 parts of water need to be added respectively.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The preparation process of this application is simple and the raw materials are cheap and readily available, which can greatly reduce the production cost. This application prepares four insecticides by combining thiamethoxam, bifenthrin, and spirotetramat. These insecticides have a good killing effect on citrus scale insects and can take effect in a short time to achieve the maximum insecticidal rate. Attached Figure Description

[0021] Figure 1 This is a flowchart of the preparation steps of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1 The present invention provides a technical solution:

[0024] An insecticidal composition for controlling citrus scale insects, the specific preparation method of which is as follows:

[0025] Step 1: Select raw materials: Take thiamethoxam, diclofenac, spirotetramat, solvent, emulsifier, penetrant, synergist, stabilizer and water;

[0026] Step 2, Preparation: Take four containers and label them as Container 1, Container 2, Container 3, and Container 4. Add 28 parts of thiamethoxam and 1 part of bipromethrin to Container 1, 47 parts of thiamethoxam and 10 parts of bipromethrin to Container 2, 9 parts of spirotetramat and 1 part of bipromethrin to Container 3, and 33 parts of spirotetramat and 10 parts of bipromethrin to Container 4. Mix the four containers together.

[0027] Solvents were added to four containers in sequence, heated to 40-50°C, and continuously mixed and stirred with a stirring device at a speed of 300-500 r / min for 8-10 minutes. Then emulsifiers, penetrants, synergists and stabilizers were added and mixed for another 10-12 minutes to obtain an oil phase system.

[0028] Step 3, Testing and Adjustment: Pour the sample into a graduated cylinder, dilute with water, and observe whether there is layering or precipitation. If instability occurs, add an appropriate amount of emulsifier to adjust. Determine the actual content of thiamethoxam, bifenthrin, and spirotetramat by liquid chromatography to ensure that it meets the requirements. Finally, obtain an insecticidal composition with a concentration of 10%-15%.

[0029] Step 4: Dispensing: Inject the prepared insecticidal composition into packaging bottles and store it away from light.

[0030] In step three, xylene is selected as the solvent, calcium dodecylbenzenesulfonate is selected as the emulsifier, polyether-modified trisiloxane is selected as the penetrant, piperonyl butyl ether is selected as the synergist, and di-tert-butyl-p-cresol is selected as the stabilizer.

[0031] In container No. 1, 15-20 parts solvent, 8-12 parts emulsifier, 3-5 parts penetrant, 2-3 parts synergist, 1.5-2.5 parts stabilizer and 50-53 parts water need to be added respectively.

[0032] The No. 2 container needs to contain 161-256 parts solvent, 57-85.5 parts emulsifier, 19-28.5 parts penetrant, 3.8-5.7 parts synergist, 3.8-5.7 parts stabilizer, and 128-220 parts water.

[0033] In the No. 3 container, 35-40 parts solvent, 10-14 parts emulsifier, 5-7 parts penetrant, 1-2 parts synergist, 1-2 parts stabilizer and 10-12 parts water need to be added respectively.

[0034] In container No. 4, 137-138 parts of solvent, 41-42 parts of emulsifier, 17-18 parts of penetrant, 6-7 parts of synergist, 5-6 parts of stabilizer and 92-93 parts of water need to be added respectively.

[0035] Thiamethoxam is a novel neonicotinoid insecticide that interferes with nerve conduction by acting on acetylcholine receptors in the insect's nervous system, ultimately leading to the insect's death. Its control effect on citrus scale insects is characterized by strong systemic activity, long-lasting effect, and clear applicable stages, as detailed below:

[0036] Thiamethoxam is highly effective against nymphs, but its efficacy against adults is limited. The nymphal stage (especially 1st and 2nd instar) of the citrus scale insect has a thin waxy layer and a highly permeable body wall. Thiamethoxam's systemic properties allow it to be absorbed through citrus leaves and branches and translocated to various parts of the plant. Nymphs are easily poisoned and die after feeding or contact with it, achieving a control efficacy of 70%-85%. However, adults have a thick waxy layer and weak mobility, making it difficult for thiamethoxam to penetrate the waxy shell. Direct contact killing is less effective, and when used alone, its efficacy against adults is usually less than 50%. It needs to be combined with contact insecticides (such as tebufenozide or mineral oil) for enhanced efficacy.

[0037] Systemic translocation kills hidden pests. After being absorbed by citrus, thiamethoxam can be translocated up and down within the plant, effectively killing scale insects (nymphs) hiding in hidden places such as the underside of leaves, crevices in branches, and the stem end of fruit. It is especially suitable for controlling areas that are difficult to cover with conventional sprays.

[0038] With a long-lasting effect, thiamethoxam reduces the number of applications. Thiamethoxam is metabolized slowly in plants, and its effective period can last for 20-30 days, covering the peak hatching period of scale insect nymphs (such as April-May in spring and August-September in autumn), thus reducing the labor costs of frequent applications.

[0039] The key time for pesticide application is during the hatching period of scale insect nymphs (the growth period of spring and autumn shoots), when the insects are less resistant to pesticides and the pesticides are more effective. Application methods include foliar spraying: dilute 1500-2000 times, focusing on spraying branches, the undersides of leaves, and near fruits to ensure the pesticide contacts the insects. Soil drenching: For tall citrus trees, pesticides can be applied to the root zone, allowing absorption and translocation throughout the tree; this is suitable for situations where spraying is difficult to achieve.

[0040] Bifenthrin is a novel type of ionic insecticide that acts on the nicotinic acetylcholine receptors of pests. It has a unique mechanism of action and exhibits strong contact toxicity, good penetration through the waxy layer, and wide applicability across a wide range of insect developmental stages in the control of citrus scale insects. Details are as follows:

[0041] It has a certain control effect on all stages of insect life, especially on nymphs and newly emerged adults. Bifenthrin has strong contact toxicity and can penetrate the waxy layer of scale insects to a certain extent. For 1st and 2nd instar nymphs (with thin waxy layers), the control effect can reach 80%-90%; for 3rd instar nymphs and newly emerged adults whose waxy shells have not yet fully hardened, the control effect is about 60%-70%; even against mature adults with thick waxy shells, it can act by contacting the gaps in the insect's body or the thinnest parts of the waxy shell, reducing the number of eggs laid.

[0042] With good rapid-acting properties, it addresses the shortcomings of systemic insecticides. Compared to systemic insecticides such as thiamethoxam, bifenthrin exhibits a more prominent rapid-acting effect. Reduced insect activity and death can be observed 1-3 days after application, quickly controlling scale insect damage to citrus, such as leaf curling and fruit deformities caused by sap sucking. It also has strong compatibility with other insecticides, making it suitable for synergistic compounding. Bifenthrin's unique mechanism of action means it exhibits no cross-resistance with thiamethoxam, spirotetramat, etc., and it is often used as a compounding ingredient to compensate for the poor efficacy of systemic insecticides against adult insects.

[0043] The best time to apply pesticide is during the peak hatching period of nymphs to the early stage of adulthood, when the waxy layer of the insect body is thinner and the pesticide can easily reach the insect body. If there are many adults, mineral oil (1%-2%) should be added to enhance the penetration of the waxy shell.

[0044] Application method: Mainly foliar spraying, with a dilution ratio of 2000-3000 times. Focus on spraying areas with dense insects, such as branches, the back of leaves, and the stem end of fruits, to ensure that the pesticide solution moistens the insects.

[0045] Spirotetramat is a novel quaternary keto acid insecticide with strong systemic activity, long residual effect, and outstanding control efficacy against all stages of scale insects (especially nymphs and eggs). It plays an important role in the control of citrus scale insects, and its specific effects are as follows:

[0046] Spirotetracycline exhibits excellent systemic conductivity, penetrating the waxy layer to reach the insect body directly. It possesses a unique "bidirectional systemic" property, allowing it to be absorbed by the roots, stems, and leaves of citrus plants and then transported throughout the plant, even through the phloem to hidden areas such as new shoots and fruits. For scale insects covered by a waxy layer, its active ingredient can be ingested by nymphs through plant sap or directly penetrate the young scale shells (1st-2nd instar nymphs) to exert its effect. It achieves 85%-95% control efficacy against nymphs and an egg hatching inhibition rate of over 80%.

[0047] With an exceptionally long-lasting effect, spirotetramat is suitable for long-term control of scale insects. Its slow metabolism within plants results in a duration of 40-60 days, far exceeding that of thiamethoxam (20-30 days) and diclofenac (10-15 days). After application, it can suppress scale insect population growth for an extended period, making it particularly suitable for use during peak nymphal hatching periods (such as April-May in spring and September-October in autumn). A single application can cover 1-2 generations of nymphs, reducing the number of applications required.

[0048] Spirotetramethrin is highly effective against eggs and young nymphs, disrupting the reproductive chain. It not only directly kills nymphs but also inhibits lipid synthesis, affecting egg development and embryo formation, thus reducing adult egg production and hatching rate. For citrus scale insects (such as the arrowhead scale and the red wax scale), its egg-inhibiting effect reduces the next generation's population, controlling the risk of outbreaks at the source.

[0049] Application timing: Focus on applying pesticides during the peak hatching period of citrus scale insect eggs (such as the spring new shoot period and the autumn fruit enlargement period). At this time, the nymphs have a thin waxy layer and are highly active, making them easy to kill with systemic pesticides.

[0050] Application methods: Foliar spraying is the main method, with a dilution ratio of 2000-3000 times. It is necessary to spray evenly on the back of the leaves, the gaps in the branches, and the surface of the fruit to ensure that the pesticide is fully absorbed by the plant. Alternatively, it can be applied by soil irrigation (especially for mature trees with well-developed root systems), allowing the pesticide to be absorbed and transported to the entire plant through the roots.

[0051] Example 1:

[0052] The specific preparation method of this insecticidal composition for controlling citrus scale insects is as follows:

[0053] Step 1: Select raw materials: Take thiamethoxam, dipropionate, solvent, emulsifier, penetrant, synergist, stabilizer and water;

[0054] Step 2, Preparation: Take a container, labeled Container 1, add 28 parts of thiamethoxam and 1 part of dipropionate into the container, and mix and stir the mixture.

[0055] Solvents are added to the container in sequence, and the mixture is heated to 40-50°C. The mixture is stirred continuously with a stirring device at a speed of 300-500 r / min for 8-10 minutes. Then, emulsifiers, penetrants, synergists, and stabilizers are added and the mixture is stirred for another 10-12 minutes to obtain the oil phase system.

[0056] Step 3, Testing and Adjustment: Pour the sample into a graduated cylinder, dilute with water, and observe whether there is layering or precipitation. If instability occurs, add an appropriate amount of emulsifier to adjust. Determine the actual content of thiamethoxam and dipropionate by liquid chromatography to ensure that it meets the requirements. Finally, obtain an insecticidal composition with a concentration of 10%-15%.

[0057] Step 4: Dispensing: Inject the prepared insecticidal composition into packaging bottles and store it away from light;

[0058] Experimental results:

[0059]

[0060] Example 2:

[0061] The specific preparation method of this insecticidal composition for controlling citrus scale insects is as follows:

[0062] Step 1: Select raw materials: Take thiamethoxam, dipropionate, solvent, emulsifier, penetrant, synergist, stabilizer and water;

[0063] Step 2, Preparation: Take a container, labeled Container 2, and add 47 parts of thiamethoxam and 10 parts of dipropionate into the container, and mix and stir the mixture.

[0064] Solvents are added to the container in sequence, and the mixture is heated to 40-50°C. The mixture is stirred continuously with a stirring device at a speed of 300-500 r / min for 8-10 minutes. Then, emulsifiers, penetrants, synergists, and stabilizers are added and the mixture is stirred for another 10-12 minutes to obtain the oil phase system.

[0065] Step 3, Testing and Adjustment: Pour the sample into a graduated cylinder, dilute with water, and observe whether there is layering or precipitation. If instability occurs, add an appropriate amount of emulsifier to adjust. Determine the actual content of thiamethoxam and dipropionate by liquid chromatography to ensure that it meets the requirements. Finally, obtain an insecticidal composition with a concentration of 10%-15%.

[0066] Step 4: Dispensing: Inject the prepared insecticidal composition into packaging bottles and store it away from light;

[0067]

[0068] Example 3:

[0069] The specific preparation method of this insecticidal composition for controlling citrus scale insects is as follows:

[0070] Step 1: Select raw materials: spirotetramat, diprotein, solvent, emulsifier, penetrant, synergist, stabilizer, and water;

[0071] Step 2, Preparation: Take a container, labeled Container 3, and add 9 parts of spirotetramat and 1 part of diprotetramat to the inside of Container 3, and mix and stir the container.

[0072] Solvents are added to the container in sequence, and the mixture is heated to 40-50°C. The mixture is stirred continuously with a stirring device at a speed of 300-500 r / min for 8-10 minutes. Then, emulsifiers, penetrants, synergists, and stabilizers are added and the mixture is stirred for another 10-12 minutes to obtain the oil phase system.

[0073] Step 3, Testing and Adjustment: Pour the sample into a graduated cylinder, dilute with water, and observe whether there is layering or precipitation. If instability occurs, add an appropriate amount of emulsifier to adjust. Determine the actual content of bispyribac-methyl and spirotetramat by liquid chromatography to ensure that it meets the requirements. Finally, obtain an insecticidal composition with a concentration of 10%-15%.

[0074] Step 4: Dispensing: Inject the prepared insecticidal composition into packaging bottles and store it away from light;

[0075]

[0076] Example 4:

[0077] The specific preparation method of this insecticidal composition for controlling citrus scale insects is as follows:

[0078] Step 1: Select raw materials: spirotetramat, diprotein, solvent, emulsifier, penetrant, synergist, stabilizer, and water;

[0079] Step 2, Preparation: Take a container, labeled Container 4, and add 33 parts of spirotetramat and 10 parts of diprotetramat to the inside of Container 4, and mix and stir the container.

[0080] Solvents are added to the container in sequence, and the mixture is heated to 40-50°C. The mixture is stirred continuously with a stirring device at a speed of 300-500 r / min for 8-10 minutes. Then, emulsifiers, penetrants, synergists, and stabilizers are added and the mixture is stirred for another 10-12 minutes to obtain the oil phase system.

[0081] Step 3, Testing and Adjustment: Pour the sample into a graduated cylinder, dilute with water, and observe whether there is layering or precipitation. If instability occurs, add an appropriate amount of emulsifier to adjust. Determine the actual content of bispyribac-methyl and spirotetramat by liquid chromatography to ensure that it meets the requirements. Finally, obtain an insecticidal composition with a concentration of 10%-15%.

[0082] Step 4: Dispensing: Inject the prepared insecticidal composition into packaging bottles and store it away from light.

[0083]

[0084] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0085] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An insecticidal composition for controlling citrus scale insects, characterized in that, The specific preparation method of this insecticidal composition for controlling citrus scale insects is as follows: Step 1: Select raw materials: Take thiamethoxam, diclofenac, spirotetramat, solvent, emulsifier, penetrant, synergist, stabilizer and water; Step 2, Preparation: Take four containers and label them as Container 1, Container 2, Container 3, and Container 4. Add 28 parts of thiamethoxam and 1 part of bipromethrin to Container 1, 47 parts of thiamethoxam and 10 parts of bipromethrin to Container 2, 9 parts of spirotetramat and 1 part of bipromethrin to Container 3, and 33 parts of spirotetramat and 10 parts of bipromethrin to Container 4. Mix the four containers together. Solvents were added to four containers in sequence, heated to 40-50°C, and continuously mixed and stirred with a stirring device at a speed of 300-500 r / min for 8-10 minutes. Then emulsifiers, penetrants, synergists and stabilizers were added and mixed for another 10-12 minutes to obtain an oil phase system. Step 3, Testing and Adjustment: Pour the sample into a graduated cylinder, dilute with water, and observe whether there is layering or precipitation. If instability occurs, add an appropriate amount of emulsifier to adjust. Determine the actual content of thiamethoxam, bifenthrin, and spirotetramat by liquid chromatography to ensure that it meets the requirements. Finally, obtain an insecticidal composition with a concentration of 10%-15%. Step 4: Dispensing: Inject the prepared insecticidal composition into packaging bottles and store it away from light.

2. The insecticidal composition for controlling citrus scale insects according to claim 1, characterized in that: In step three, xylene is selected as the solvent, calcium dodecylbenzenesulfonate is selected as the emulsifier, polyether-modified trisiloxane is selected as the penetrant, piperonyl butyl ether is selected as the synergist, and di-tert-butyl-p-cresol is selected as the stabilizer.

3. The insecticidal composition for controlling citrus scale insects according to claim 1, characterized in that: In container No. 1, 15-20 parts solvent, 8-12 parts emulsifier, 3-5 parts penetrant, 2-3 parts synergist, 1.5-2.5 parts stabilizer and 50-53 parts water need to be added respectively.

4. The insecticidal composition for controlling citrus scale insects according to claim 1, characterized in that: The No. 2 container needs to contain 161-256 parts solvent, 57-85.5 parts emulsifier, 19-28.5 parts penetrant, 3.8-5.7 parts synergist, 3.8-5.7 parts stabilizer, and 128-220 parts water.

5. The insecticidal composition for controlling citrus scale insects according to claim 1, characterized in that: In the No. 3 container, 35-40 parts solvent, 10-14 parts emulsifier, 5-7 parts penetrant, 1-2 parts synergist, 1-2 parts stabilizer and 10-12 parts water need to be added respectively.

6. The insecticidal composition for controlling citrus scale insects according to claim 1, characterized in that: In container No. 4, 137-138 parts of solvent, 41-42 parts of emulsifier, 17-18 parts of penetrant, 6-7 parts of synergist, 5-6 parts of stabilizer and 92-93 parts of water need to be added respectively.

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