A suspension containing spinosad and emamectin benzoate and its use

Abstract

The application belongs to the technical field of insecticides, and particularly relates to a suspension agent containing ethyl spinosad and emamectin benzoate and application thereof. The suspension agent contains the following ingredients in percentage by weight: ethyl spinosad 1-4%, emamectin benzoate 6-10%, synergist 2-6%, wetting dispersant 5-10%, thickening agent 0.1-1%, suspending agent 0.1-1%, defoaming agent 0.1-1%, antifreezing agent 1-5%, preservative 0.05-0.3%, and deionized water 100%. The synergist is composed of silwet 618 and GY-Tmax. The suspension agent prepared by the application has excellent preparation performance, and the addition of the synergist GY-Tmax, silwet 618 or the combination of GY-Tmax and silwet 618 in the suspension agent can significantly improve the field control effect of the suspension agent on crop pests.

Description

Technical Field

[0001] This invention belongs to the field of insecticide technology, specifically a suspension containing ethyl spinosad and abamectin and its application. Background Technology

[0002] Ethyl spinosad is a new spinosad insecticide produced by Dow AgroSciences. Within the spinosyn class of insecticides, ethyl spinosad is a novel and unique active ingredient, a highly effective and broad-spectrum insecticide. It is primarily used to control lepidopteran and tsandroptera larvae, and has good control effects on vegetable pests such as diamondback moth, beet armyworm, leaf miner, thrips, cotton bollworm, and bean pod borer. It is widely used in the rotation of pesticides for resistance management of vegetable pests.

[0003] Emamectin benzoate, also known as abamectin, has three orders of magnitude higher insecticidal activity compared to avermectin. It exhibits extremely high activity against lepidopteran larvae and many other pests, acting as both a stomach poison and a contact insecticide. It is highly effective even at very low doses and does not harm beneficial insects during pest control, thus facilitating integrated pest management. Emamectin benzoate has high biological activity against many pests, especially lepidopterans and dipterans, such as cotton bollworm, tobacco hawk moth, diamondback moth, beet armyworm, fall armyworm, striped armyworm, cabbage looper, cabbage white butterfly, cabbage leafminer, cabbage stem borer, tomato hawk moth, and potato beetle.

[0004] Patent document CN102396474B discloses an insecticidal composition containing ethyl spinosad and a bio-based insecticide, wherein the bio-based insecticide is abamectin, emamectin benzoate, or ivermectin; the weight ratio of ethyl spinosad to the bio-based insecticide is 1:60-60:1; it can be used to control rice stem borers, diamondback moths, beet armyworms, and cotton bollworms. The composition not only expands the application range of insecticides, but also reduces the amount of pesticide used while significantly enhancing efficacy and ensuring optimal control effect, thereby reducing the amount used per acre, thus reducing costs and environmental harm.

[0005] CN102578115A discloses a compound suspension of ethyl spinosad and abamectin. The composition of its raw materials, by weight percentage, is as follows: ethyl spinosad 0.1-20%, abamectin 0.1-35%, dispersant 0.5-4%, wetting agent 0.5-5%, thickener 0.1-4.5%, antifreeze 0.5-5%, preservative 0.1-0.6%, defoamer 0.1-0.8%, and water 42.0-83.0%. The prepared compound suspension has a broad spectrum of insect control, making it difficult for pests to develop resistance. The preparation process is relatively simple, and the production cost is low. It does not require a large amount of organic solvent, thus reducing costs and minimizing the irritation to operators and environmental pollution caused by organic solvents.

[0006] Existing technologies disclose that the combination of ethyl spinosad and abamectin has a significant synergistic effect, and also disclose suspension formulations containing ethyl spinosad and abamectin; however, existing technologies do not have relevant research on synergists for the combination of ethyl spinosad and abamectin, and in actual use, there is still room for improvement in the field control efficacy of the agent against crop pests. Summary of the Invention

[0007] This invention provides a suspension containing ethyl spinosad and emamectin benzoate, and its application. The technical solution of this invention is as follows:

[0008] A suspension containing ethyl spinosad and abamectin, comprising the following components in weight percentage: ethyl spinosad 1-4%, abamectin 6-10%, synergist 2-6%, wetting and dispersing agent 5-10%, thickener 0.1-1%, suspending agent 0.1-1%, defoamer 0.1-1%, antifreeze 1-5%, preservative 0.05-0.3%, and deionized water to make up 100%.

[0009] The synergist described in this invention is composed of silwet 618 and GY-Tmax. Preferably, the mass ratio of silwet 618 to GY-Tmax is 1:1 to 1:7.

[0010] The suspending agent of the present invention comprises the following components in weight percentage: 2% spinosad ethyl, 8% abamectin, 4% synergist, 5-10% wetting and dispersing agent, 0.1-1% thickener, 0.1-1% suspending agent, 0.1-1% defoamer, 1-5% antifreeze, 0.05-0.3% preservative, and deionized water to make up to 100%.

[0011] The suspending agent of the present invention comprises the following components in weight percentage: 2% spinosad ethyl, 8% abamectin, 4% synergist, 2% calcium lignosulfonate, 5% Tersperse 2700, 0.15% xanthan gum, 0.3% magnesium aluminum silicate, 0.3% organobentonite, 3% glycerol, 0.1% sodium benzoate, 0.25% SAG1572, and deionized water to make up to 100%; the mass ratio of the synergist silwet 618 to GY-Tmax is 1:1 to 1:7.

[0012] The suspension agent described in this invention is used for the control of crops such as diamondback moth, beet armyworm, cotton bollworm, leaf miner, thrips, cotton bollworm, bean pod borer, and fall armyworm.

[0013] By adopting the above technical solution, the present invention has the following beneficial effects:

[0014] The 10% ethyl spinosad·emamectin benzoate suspension prepared by this invention has excellent suspension performance, and the prepared suspension is qualified.

[0015] Adding synergists GY-Tmax, silwet 618, or a combination of GY-Tmax and silwet 618 to 10% spinosad·emamectin benzoate suspension concentrate can significantly improve the field control efficacy of the suspension concentrate against crop pests. In particular, the improvement in efficacy is especially significant when the mass ratio of silwet 618 to GY-Tmax is 1:1 to 1:7. Detailed Implementation

[0016] The specific embodiments of the present invention will be further explained below with reference to specific examples.

[0017] Example 1: Preparation of 10% Ethyl Spinosad·Abamectin Suspension

[0018] Experimental materials:

[0019] Technical grade: Ethyl spinosad, abamectin; Wetting and dispersing agents: Calcium lignosulfonate, Tersperse 2700; Synergists: Silwet 618, GY-Tmax; Thickeners: Magnesium aluminum silicate, xanthan gum; Suspension agent: Organobentonite; Antifreeze agent: Glycerol; Preservative: Sodium benzoate; Defoamer: SAG1572; Solvent: Deionized water;

[0020] Instruments: electronic balance, dispersion mill, pH meter, high performance liquid chromatograph, laser particle size analyzer, water bath, etc.

[0021] Preparation method: According to the formula composition, first add some deionized water, antifreeze, preservative, wetting and dispersing agent and some defoamer. After shearing for 5-10 minutes using a laboratory dispersion mill, add thickener, ethyl spinosad and abamectin. Continue shearing for 10-15 minutes, then transfer to a dispersion mill for sand milling. The sand milling time is 1.0-1.5 hours, and the particle size is controlled at D90≤5μm. After sand milling, filter zirconium beads, then add the remaining defoamer and remaining deionized water, shear and mix evenly, and perform testing and analysis of various technical indicators.

[0022] Testing methods: The mass fraction of the active ingredient was determined by HPLC; pH value, suspension rate, pourability, persistent foaming, wet sieving test, low temperature stability and thermal storage stability were all determined according to national standards.

[0023] Suspension agent formulation screening:

[0024] Table 1: Suspension Formulation

[0025]

[0026]

[0027] Results and Analysis:

[0028] The 10% ethyl spinosad·emamectin benzoate suspension prepared by this invention has excellent suspension performance and the prepared suspension is qualified.

[0029] Table 2: 10% Ethyl Spondioxin·Abamectin Suspension Concentrate

[0030]

[0031] Example 2: Field control efficacy of 10% spinosad·emamectin benzoate against diamondback moth in cabbage.

[0032] The experimental crop, cabbage, showed consistent and good growth throughout the experimental area.

[0033] Experimental pest: Diamondback moth

[0034] Test reagents: Formulations 1-7 of Example 1

[0035] Experimental design: A treatment group and a blank control group were set up, with each treatment repeated 4 times. The blocks were arranged in a randomized block design, and a protection row was set around each block.

[0036] Experimental method: The diamondback moth was in the peak egg hatching stage to the 3rd instar larval stage when the pesticide was applied in the field. A backpack sprayer was used, and the pesticide was applied evenly according to the experimental design dosage, with a spray volume of 30L / 667m2.

[0037] Methods: Based on the relevant content of "GB / T17980.13-2000 Field Efficacy Test Guidelines for Pesticides (I) Control of Lepidoptera Larvae in Cruciferous Vegetables with Insecticides", the number of live larvae on 10 cabbage plants in each plot was investigated. Two surveys were conducted during the trial period: the initial insect population was surveyed before application, and the remaining live insect population was surveyed 7 days after application. The control effect was then calculated.

[0038] Control efficacy (%) = [1 - (number of live insects in the control area before treatment × number of live insects in the treatment area after treatment) / (number of live insects in the control area after treatment × number of live insects in the treatment area before treatment)] × 100.

[0039] Test results

[0040] As shown in Table 3, compared with Formula 8, the addition of synergist GY-Tmax or the combination of GY-Tmax and silwet 618 to 10% spinosad·emamectin benzoate suspension can significantly improve the field control efficacy of the suspension against diamondback moth in cabbage. In particular, the improvement in efficacy is especially significant when the mass ratio of silwet 618 to GY-Tmax is 1:1 to 1:7.

[0041] Table 3: Field control efficacy of 10% spinosad·emamectin benzoate against diamondback moth in cabbage.

[0042]

[0043] Example 3: Field control efficacy of 10% spinosad·emamectin benzoate against fall armyworm in corn

[0044] The experimental crop was maize, which grew in a generally consistent and good manner within the experimental area. The fertilizer and water management and cultivation practices were consistent with those of conventional methods.

[0045] Experimental pest: Fall armyworm

[0046] Test reagents: Formulations 1-7 of Example 1

[0047] Experimental design: A treatment group and a blank control group were set up, with each treatment repeated 4 times. The blocks were arranged in a randomized block design, and a protection row was set around each block.

[0048] Experimental method: During the experiment, the corn growth period was from seedling stage to jointing stage. Backpack sprayers were used, and the dosage was strictly followed according to the experimental design and sprayed evenly. The spray volume was 45L / 667m2.

[0049] Investigation methods: The initial insect population was assessed before pesticide application, and the number of remaining live insects was assessed 14 days after application to calculate the control effect. A five-point sampling method was used, with 10 plants sampled at each point, and the number of live insects in each plot was counted. The initial insect population in each plot was between 400 and 500 insects per plant, indicating a moderate infestation level. Simultaneously, the effects of different pesticide treatments on corn growth were observed to determine whether phytotoxicity or related symptoms occurred.

[0050] Table 4 shows that, compared with formulation 8, adding synergists GY-Tmax, silwet 618, or a combination of GY-Tmax and silwet 618 to the 10% spinosad·emamectin benzoate suspension significantly improves the field control efficacy against fall armyworm in corn, especially when the mass ratio of silwet 618 to GY-Tmax is 1:1-1:7. Field observations confirmed crop safety.

[0051] Table 4: Field control efficacy of 10% spinosad·emamectin benzoate against fall armyworm in corn.

[0052]

[0053]

[0054] Finally, it should be noted that the above examples are merely a few specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the content disclosed in this invention are considered to be within the scope of protection of this invention.

Claims

1. A suspension containing ethyl spinosad and emamectin benzoate, characterized in that, It contains the following ingredients by weight percentage: 1-4% spinosad ethyl, 6-10% abamectin, 2-6% synergist, 5-10% wetting and dispersing agent, 0.1-1% thickener, 0.1-1% suspending agent, 0.1-1% defoamer, 1-5% antifreeze, 0.05-0.3% preservative, and deionized water to make up to 100%; the synergist is composed of silwet 618 and GY-Tmax, and the mass ratio of silwet 618 to GY-Tmax is 1:1-1:

7.

2. The suspending agent according to claim 1, characterized in that, Ethyl spinosad 2%, abamectin 8%, synergist 4%, wetting and dispersing agent 5-10%, thickener 0.1-1%, suspending agent 0.1-1%, defoamer 0.1-1%, antifreeze 1-5%, preservative 0.05-0.3%, deionized water to make up to 100%.

3. The suspending agent according to claim 1, characterized in that, The formula contains: 2% spinosad, 8% abamectin, 4% synergist, 2% calcium lignosulfonate, 5% Tersperse 2700, 0.15% xanthan gum, 0.3% magnesium aluminum silicate, 0.3% organobentonite, 3% glycerol, 0.1% sodium benzoate, 0.25% SAG1572, and deionized water to make up to 100%; the mass ratio of the synergist silwet618 to GY-Tmax is 1:1 to 1:

7.

4. The use of the suspension agent according to any one of claims 1-3 for the control of diamondback moth, beet armyworm, cotton bollworm, leaf miner, thrips, beet armyworm, bean pod borer, and fall armyworm.

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