A herbicidal composition comprising flurochloridone and difenpyrrole-ate and use thereof

Abstract

The present application belongs to the field of agricultural herbicides, and provides a herbicidal composition containing flurochloridone and difenpyrrole-ate and application thereof; the herbicidal composition is in the form of a suspension concentrate, and contains the following ingredients by weight percentage: flurochloridone 0.1-5%, difenpyrrole-ate 1-20%, wetting dispersant 1-13%, antifreezing agent 1-8%, thickening agent 0.1-2%, defoaming agent 0.01-0.5%, preservative 0.01-1%, and deionized water to 100%; the wetting dispersant is composed of Dispersol CBZ, Atplus 1209 and Morwet D-390. The suspension concentrate formula of the present application can significantly improve the suspension performance and pouring property of the preparation, and reduce the wall-hanging phenomenon of the preparation; meanwhile, the present application has excellent control effect on weeds in wheat fields.

Description

Technical Field

[0001] This invention belongs to the field of agricultural herbicides, specifically relating to a herbicidal composition comprising fluroxypyridine ester and pyrfluthrin and its application. Background Technology

[0002] Fluroxypyridine ester is a novel herbicide developed by Dow AgroSciences (now Corteva). It is the first product in the new chemical class of arylpyridine carboxylate esters among synthetic auxin-based herbicides. It mimics the effects of high doses of natural plant growth hormones, causing overstimulation of specific auxin-regulating genes and interfering with multiple growth processes in sensitive plants. Studies show that fluroxypyridine ester can be used on various grains, including rye, triticale, wheat, and barley, for post-emergence control of broadleaf weeds such as shepherd's purse, cleavers, and cleavers, as well as noxious weeds. Its novel mechanism of action makes it effective against resistant weeds, and it is considered a new tool for controlling stubborn broadleaf weeds on crops such as wheat and barley, requiring extremely low dosages. Fluroxypyridine ester degrades rapidly in soil, thus having minimal impact on subsequent crops.

[0003] Pyrifluquinazon is an amide herbicide. When applied before or after weed germination, it forms a leaching-resistant herbicide layer on the soil surface, maintaining its activity throughout the crop's growth cycle. When weeds germinate, the herbicide is absorbed through the herbicide-covered seedlings or roots. It inhibits carotenoid biosynthesis, leading to a decrease in carotenoid content in the weed plants, resulting in chlorophyll destruction, cell membrane rupture, and the weeds exhibiting discoloration or whitening of the seedlings, eventually causing the entire plant to wilt and die. The rate of death is related to light intensity; it is faster in strong light and slower in weak light. It can be used to control annual broadleaf weeds.

[0004] Existing technologies have disclosed reports on the combined use of fluopyridine ester and pyrfluthrin: CN201610145994.5 discloses a herbicide composition containing fluopyridine ester and pyrfluthrin suitable for wheat fields. The weight ratio of the active ingredients fluopyridine ester and pyrfluthrin ranges from 1:1.6 to 1:100. This herbicide composition broadens the weed control spectrum, enhances efficacy, avoids the rapid development of weed resistance caused by using a single herbicide, delays the development of weed resistance, reduces the amount of herbicide used, lowers usage costs, and reduces environmental pollution. This patent application studied the synergistic effect between the active ingredients but did not study the performance of the formulation.

[0005] Suspension concentrates are a type of highly efficient, safe, and environmentally friendly pesticide formulation. With the help of surfactants and other adjuvants, insoluble or poorly soluble active ingredients are dispersed in water to form a uniform and stable coarse suspension system. Suspension concentrates offer many advantages, including good dispersibility and spreading properties, high suspension rate, strong adhesion to plant surfaces, and resistance to rain washout. Furthermore, because water is the dispersion medium, suspension concentrates are low-cost, safe to produce, store, transport, and use, and can be mixed with water in any proportion, unaffected by water quality or temperature, making them convenient to use. However, the physical properties of suspension concentrates are easily affected by environmental factors such as temperature and humidity, which may lead to decreased stability, stratification, and clumping. Therefore, strict control of particle size, stability, and suspension rate is necessary for suspension concentrates, requiring the use of large amounts of adjuvants and dispersion media. The selection of excipients significantly impacts the performance of suspension concentrate formulations. Summary of the Invention

[0006] This invention provides a herbicidal composition comprising fluopyridine ester and pyrfluthrin and its application. The suspension concentrate provided by this invention has excellent suspension rate, pourability, and stability. The specific technical solution is as follows:

[0007] A herbicidal composition comprising fluopyridine ester and pyrfluthrin, wherein the herbicidal composition is in the form of a suspension concentrate, comprising the following components in weight percentage: fluopyridine ester 0.1-5%, pyrfluthrin 1-20%, wetting and dispersing agent 1-13%, antifreeze agent 1-8%, thickener 0.1-2%, defoamer 0.01-0.5%, preservative 0.01-1%, and deionized water to make up to 100%;

[0008] The wetting and dispersing agent is composed of Dispersol CBZ, Atplus 1209 and Morwet D-390, and the mass ratio of Dispersol CBZ, Atplus 1209 and Morwet D-390 is 1-8:1-8:1-8.

[0009] Preferably, the herbicidal composition comprises the following components in weight percentage: 0.1-2% fluopyridine ester, 1-10% pyrfluthrin, 1-13% wetting and dispersing agent, 1-8% antifreeze agent, 0.1-2% thickener, 0.01-0.5% defoamer, 0.01-1% preservative, and deionized water to make up to 100%;

[0010] The antifreeze is glycerol, the thickener is composed of magnesium aluminum silicate and xanthan gum, the preservative is BIT20, and the defoamer is dimethyl silicone oil.

[0011] The herbicidal composition described in this invention is used for the control of crop weeds, particularly for the control of broadleaf weeds in wheat.

[0012] By adopting the above technical solution, the present invention has the following beneficial effects:

[0013] When the wetting and dispersing agents are used in combination with Dispersol CBZ, Atplus 1209, and Morwet D-390, the suspension and pouring properties of the formulation can be significantly improved, and the phenomenon of formulation sticking to the wall can be reduced. The suspension formulation prepared by this invention has excellent control effect on broadleaf weeds in wheat fields, with a field control efficacy of more than 88%, of which formulation 4 has a field control efficacy of 100%. Detailed Implementation

[0014] The present invention will be further explained below with reference to specific embodiments.

[0015] Example 1: Preparation of Suspension Agent

[0016] Experimental Materials and Methods

[0017] Experimental materials: fluroxypyridine ester, pyrfluthrin, Dispersol CBZ, Atplus 1209, Morwet D-390, glycerol, magnesium aluminum silicate, xanthan gum, deionized water;

[0018] Main experimental instruments: electronic balance, CX31 microscope, JL-1156 laser particle size distribution tester, sand mill, etc.

[0019] Preparation method: This pesticide formulation is prepared by mixing the technical grade pesticide, wetting and dispersing agent, antifreeze agent, thickener, defoamer, etc., in a certain proportion with water as the dispersion medium and then wet-milling them. During grinding, zirconium oxide beads are added to the mixture, with a specific gravity 1.5 times the weight of the suspension itself. High-speed grinding at 1500 r / min at room temperature reduces the average particle size of the suspension to below 5 μm. The pesticide suspension can be obtained after separating the zirconium beads.

[0020] Table 1. Composition of Suspension Agent Formulation

[0021]

[0022] Table 1. Continued Suspension Formulation Composition

[0023]

[0024]

[0025] Formulation performance indicators were tested using conventional testing methods in the field.

[0026] Table 2 Performance Indicators of Suspension Formulations

[0027]

[0028] Table 2 Performance Indicators of Suspension Formulations

[0029]

[0030]

[0031] Measurement results:

[0032] The choice of wetting and dispersing agents in suspension formulations significantly affects the suspension rate and pourability. When Dispersol CBZ, Atplus 1209, and Morwet D-390 are used in combination, the suspension performance and pourability of the formulation are significantly improved, and the phenomenon of formulation adhesion to the wall is reduced. In particular, formulation 4, compared with other formulations, exhibits superior formulation performance when the mass ratio of Dispersol CBZ, Atplus 1209, and Morwet D-390 is 1:5:3.

[0033] Example 2: Field control efficacy of fluroxypyr ester·pyrfluthrin suspension against broadleaf weeds in wheat fields

[0034] Test reagents: Formulations 1-7 in Example 1;

[0035] Test method: The experiment consisted of 7 treatment experimental plots and 1 blank control. The plots were randomly arranged and replicated 4 times. The plot area was 45m². 2 When applying the pesticide, the wheat should be at the 3-leaf, 1-heart stage. A backpack sprayer should be used for conventional foliar spraying, with a spray volume of 450 L / hm². 2 Fresh weight of broadleaf weeds (shepherd's purse, shepherd's purse, cleavers, and chickweed) was collected 30 days after application. Four points were taken from each plot, with each point covering an area of ​​0.25 m². 2 And calculate the fresh weight control efficacy against weeds.

[0036] Calculation formula: Fresh weight control efficacy (%) = [(fresh weight of weeds in control area - fresh weight of weeds in treatment area) / fresh weight of weeds in control area] × 100.

[0037] Test results:

[0038] As shown in Table 3, formulations 1-7 have excellent control effects on broadleaf weeds in wheat fields, with field control efficacy greater than 88%, and formulation 4 has a field control efficacy of 100%.

[0039] Table 3: Field control efficacy of fluroxypyr ester·pyrfluthrin suspension against broadleaf weeds in wheat fields

[0040]

[0041] Finally, it should be noted that the above examples are merely a few specific embodiments of the present invention. All modifications 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 herbicidal composition comprising fluroxypyridine ester and pyrfluthrin, characterized in that, The herbicidal composition is in suspension formulation and contains the following components in weight percentage: fluopyridine ester 0.4%, pyrfluthrin 5.1%, wetting and dispersing agent 9%, antifreeze agent 5%, thickener 0.55%, defoamer 0.1%, preservative 0.2%, and deionized water to make up to 100%. The antifreeze is glycerol, the thickener is 0.4% magnesium aluminum silicate and 0.15% xanthan gum, the preservative is BIT20, and the defoamer is dimethyl silicone oil. The wetting and dispersing agent is composed of Dispersol CBZ, Atplus 1209 and Morwet D-390, with a mass ratio of 1-4:2-5:2-5.

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