CN102027932B - Synergistic weeding composition containing clopyralid and carfentrazone-ethyl and application thereof - Google Patents

Abstract

The invention discloses a synergistic herbicidal composition containing clopyralid and pyrenzazone-ethyl and its application. The herbicidal composition uses clopyralid and pyrenzazone-ethyl as main active ingredients, wherein clopyralid The mass ratio of acid to carfentrazone-ethyl is 1-80:1-80. The synergistic herbicidal composition of the present invention can be used in post-emergence weeding in wheat fields, especially in controlling various broad-leaved weeds in wheat fields, and has remarkable effects. Compared with a single dose, the herbicidal composition of the present invention delays weed resistance, has a wide herbicidal spectrum, long duration of action and is safe to wheat and subsequent crops on the premise of improving the efficacy of a single agent.

Description

A synergistic herbicidal composition containing clopyralid and mefentrazone-ethyl and its application

technical field

The invention belongs to the technical field of pesticides, in particular to the field of herbicides, and relates to a binary compound of clopyralid and mefentrazone-ethyl. The herbicidal composition can be used for post-emergence weeding in wheat fields.

Background technique

Wheat is the main food crop in my country. It is reported that every year wheat in the country has different degrees of weed damage. If the weeding is not done in the field, the wheat yield can be reduced by more than 50%. In order to reduce the economic loss caused by weeds and reduce labor intensity, chemical weeding has gradually been accepted by people because of its convenience, quick effect and long control time.

In recent years, with the increase of herbicide varieties and the widespread promotion of chemical control technology in agricultural production, chemical weeding has been widely used in various stages of wheat growth. Due to the different climate characteristics and planting habits in different regions, the time of sowing and cultivating wheat is different, but the basic chemical weeding methods are the same, and the main factors to be considered are temperature, soil quality, wheat variety and farming habits. Reasonable selection of herbicides will not only reduce the labor intensity and labor time of farmers, but also reduce the cost of cultivation and increase production.

Clopyralid, chemical name: 3,6-dichloropyridine-2-carboxylic acid, its structural formula is:

Clopyralid is a pyridine herbicide that can effectively control weeds of Asteraceae, Leguminosae, Solanaceae and Umbelliferae. It is selective in grasses and is equally selective in a variety of broadleaf crops including Brassic and other sugar beet crops, flax, strawberries and alliums. Its broad herbicidal spectrum can effectively control annual weeds and deep-rooted perennial weeds. However, it has a narrow herbicidal spectrum and is ineffective against field bindweed, etc. It is difficult to completely kill broad-leaved weeds in wheat fields. Therefore, it needs to be used in combination with other herbicides to achieve the desired weeding effect.

Carfentrazone-ethyl, also known as carfentrazone-ethyl, a triazolinone herbicide, chemical name: (RS)-2-chloro-3-[2-chloro-5-(4-di Fluoromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)-4-fluorophenyl]propionate, its chemical formula is: C ₁₅ H ₁₄ Cl ₂ F ₃ N ₃ O ₃ . The structural formula is:

Mefentrazone-ethyl is an inhibitor of protoporphyrinogen oxidase, which not only causes cell membrane damage by inhibiting protoporphyrinogen oxidase in the process of chlorophyll biosynthesis, but also causes leaves to dry up and die quickly. Its half-life in soil is only a few hours, making it safe for poor crops. It can control broad-leaved weeds in wheat fields, and has excellent control effects on weeds such as pig scorpion, velvetleaf, red heart lily, and ATC morning glory. Good activity on weeds resistant to sulfonylurea herbicides. However, pyrentrazone-ethyl can only be used as a treatment agent for stems and leaves. It cannot control unearthed weeds, and its control effect on older weeds is poor. In addition, high doses will cause phytotoxicity to wheat, so when used, Pay special attention to the timing and dosage of medication.

At present, herbicides in wheat fields are limited by the safety of crops, and their herbicidal spectrum is also limited. Using a single herbicide alone cannot completely and effectively control the occurrence of weeds in wheat fields. If the effective period is too long, the dosage is too large or the application is uneven, it will easily cause residual toxicity to the crops of the current season or the subsequent crops. Therefore, the present invention selects two herbicides with different herbicidal spectrums and complementary advantages and disadvantages, clopyralid and pyrenzazone-ethyl, and then formulates a mixture for use after appropriate reduction, which not only expands the herbicidal spectrum, but also obviously improves the herbicidal effect. , It also avoids the possibility of phytotoxicity to current crops and residual toxicity to subsequent crops.

Contents of the invention

The object of the present invention is to provide a synergistic herbicidal composition containing clopyralid and pentrazone-ethyl.

Another object of the present invention is to provide the application of the herbicidal composition in weeding wheat fields.

A synergistic herbicidal composition containing clopyralid and pyrenzazone-ethyl, which is characterized in that the herbicidal composition uses clopyralid and pyrenzazone-ethyl as main active ingredients, wherein clopyralid and pyrenzazone The mass ratio of glucosyl ester is 1-80:1-80. Preferably, the mass ratio of clopyralid to mefentrazone-ethyl is 1-35:1-40.

In the synergistic herbicidal composition, the mass percent content of both clopyralid and mefentrazone-ethyl in the herbicidal composition is 1-85%, preferably 10-80%. The active ingredients described in the present invention are present in the composition in a synergistically effective dose.

In the binary compound preparation of clopyralid and mefentrazone-ethyl of the present invention, in addition to active ingredients such as clopyralid and mefentrazone-ethyl, conventional surfactants and thickeners allowed in pesticide preparations can also be added. Additives such as additives, solvents or solid fillers can be formulated into any dosage form allowed on pesticides. Preference is given to processing into wettable powders, soluble powders, water-dispersible granules, suspensions, dry suspensions or granules. Conventional methods such as spraying can be used for application.

Described surface active agent can specifically adopt alkylphenol polyoxyethylene ether, styrene ethylphenol polyoxyethylene ether, sodium methylnaphthalene sulfonate formaldehyde condensate, nonylphenol polyoxyethylene ether, NNO (methylene dicarboxylate) Sodium sulfonate), etc., the solid filler can be kaolin, diatomaceous earth, etc., and the solvent can be ethylene glycol, cyclohexanone, xylene, water, etc. These adjuvants can be used singly or in combination, and other adjuvants allowed on pesticide formulations can also be added.

The "%" mentioned in the present invention is the percentage by weight.

The synergistic herbicidal composition of the present invention can be used in post-emergence weeding in wheat fields, especially in controlling broad-leaved weeds in wheat fields and has a remarkable effect.

The herbicide composition of the present invention has the following advantages:

1. High herbicidal activity. Clopyralid is a systemic selective herbicide, and mefentrazone-ethyl is a protoporphyrinogen oxidase inhibitor, that is to say, the herbicidal composition of the present invention can kill weeds by two different ways, which can be extremely effective. Dadi enhances the herbicidal activity of herbicidal compositions.

2. Expand the grass spectrum. Clopyralid can control various annual and perennial broad-leaved weeds, while mefentrazone-ethyl can control broad-leaved weeds and sedge weeds, and the weeding spectrum is wider.

3. High security. Since the content of various active ingredients is reduced, the safety of the medicament to wheat and subsequent crops is also improved under the premise of improving the efficacy of the medicament.

Therefore, the synergistic herbicidal composition of the present invention can be used in the preparation of herbicides for post-emergence weeding in wheat fields, especially in the preparation of herbicides for controlling broad-leaved weeds in wheat fields.

Detailed ways

Example 1

Mefentrazone-ethyl 1%, Clopyralid 29%, Sodium Naphthalene Sulfonate Formaldehyde Condensate 6%, Nonylphenol Polyoxyethylene Ether 3%, Magnesium Aluminum Silicate 0.5%, Ethylene Glycol 7%, Water To 100%, according to the conventional preparation method, it is prepared into a suspension concentrate with a mass percentage content of 30%.

Example 2

4% of carfentrazone-ethyl, 32% of clopyralid, 8% of NNO (sodium methylene bis-tetrasulfonate), 7% of alkylphenol polyoxyethylene ether, 100% of sodium lignosulfonate, according to the conventional Preparation method It is prepared as a dry suspension concentrate with a mass percent content of 36%.

Example 3

Profentrazone-ethyl 10%, clopyralid 70%, NNO (sodium methylene bis-tetrasulfonate) 5%, sodium lignosulfonate 6%, ammonium sulfate 3%, diatomaceous earth to 100%, according to conventional The preparation method is formulated into water-dispersible granules with a mass percent content of 80%.

Example 4

5% carfentrazone-ethyl, 55% clopyralid, 10% NNO (sodium methylene bis-tetrasulfonate), 5% woody sodium iodate, 100% kaolin, prepared as mass percentage according to conventional preparation method 60% wettable powder.

Example 5

Profentrazone-ethyl 19%, clopyralid 1%, NNO (sodium methylene bis-tetrasulfonate) 6%, sodium dodecylbenzene sulfonate 5%, ammonium sulfate 10%, sodium lignosulfonate to 100%, according to the conventional preparation method, it is prepared into a dry suspension concentrate with a mass percent content of 20%.

Example 6

Profentrazone-ethyl 1%, clopyralid 9%, NNO (sodium methylene bis-tetrasulfonate) 6%, sodium lignosulfonate 5%, ammonium sulfate 10%, kaolin to 100%, according to the conventional preparation Methods Prepare granules with a mass percentage of 10%.

Example 7

1), indoor activity determination test

Utilize the preparation among the embodiment 1～4, measure its co-toxicity coefficient to amaranth.

Test method: Sow quantitative seeds of Amaranth in 9cm disposable paper cups, sow 10-15 seeds in each cup, and cultivate them in a light incubator. Spray treatments on crop sprays. After the treatment, continue to cultivate in the greenhouse, regularly observe the control effect of each treatment on weeds, weigh the fresh weight of each treatment after 30 days, and calculate its toxicity regression curve and co-toxicity coefficient according to Sun Yunpei's method (proposed in 1960). A co-toxicity coefficient greater than 100 indicates that the two effective substances have a synergistic effect, and a co-toxicity coefficient of less than 100 indicates that the two effective substances have an antagonistic effect. The measurement results are shown in Table 1.

Table 1 Indoor activity measurement results

It can be seen from the above table that the co-toxicity coefficients of the two effective substances after compounding are all greater than 100, indicating that the present invention has obvious synergistic effect.

2. Field drug efficacy test.

Drugs for testing:

Four binary compound herbicidal compositions in Examples 1-4.

Comparative drug:

40% carfentrazone-ethyl dry suspension concentrate (commercially available), 30% clopyralid aqueous solution (commercially available).

Tested crops: wheat

The pre-emergence and early post-emergence to the 4-leaf stage of the wheat grow well, the plants are strong, and there are no other diseases and insect pests.

Prevention object:

Broad-leaved weeds such as pig's weed, mother-of-pearl, ATC morning glory, velvetleaf

experiment method:

Accurately weigh various agents according to the area of the test plot, and after diluting with water, use a knapsack sprayer to spray evenly, and the nozzles are herbicide-specific fan-shaped nozzles. When spraying, pay attention to spraying the liquid medicine evenly into the test area, so that there is no leakage or overspray.

After the test, weed death was observed at 20 days and 40 days after application, and the herbicidal activities of various agents were compared (the dosages are the dosages of active ingredients per mu of land). In addition, the production of the crops should be observed within 1 to 15 days after the application to investigate whether the pesticides have phytotoxicity on the crops.

The herbicidal test effects of the preparations of the embodiments of the present invention are shown in Table 2 (after 20 d) and Table 3 (40 d) below.

Table 2 field efficacy test results (20d after the medicine)

treatment agent Consumption (ga.i/mu) Anti-effect of mother-in-law (%) Other broad-leaved weed control effect (%) Total control effect (%) Example 1 8 95 91 94 Example 2 8 89 94 91 Example 3 8 94 92 93 Example 4 8 90 92 91 30% Clopyralid Aqueous Solution 15 80 70 75 40% carfentrazone-ethyl dry suspension concentrate 8 78 82 78

Table 3 field efficacy test results (40d after medicine)

treatment agent Consumption (ga.i/mu) Anti-effect of mother-in-law (%) Other broad-leaved weed control effect (%) Total control effect (%) Example 1 8 88 84 87 Example 2 8 84 86 85 Example 3 8 87 84 85 Example 4 8 83 85 84 30% Clopyralid Aqueous Solution 15 70 67 68 40% carfentrazone-ethyl dry suspension concentrate 8 68 72 70

It can be seen from Table 2 and Table 3 that the present invention has significant control effects on broad-leaved weeds, with remarkable synergistic effect and long-lasting effect.

Table 4 The results of the investigation of the safety of pesticides on crops

The wheat in each treatment plot was growing well without any drug spot, which indicated that all kinds of pesticides were safe to wheat.

Claims (7)

1. A synergistic herbicidal composition containing clopyralid and pyrenzazone-ethyl, characterized in that the herbicidal composition uses clopyralid and pyrenzazone-ethyl as active ingredients, wherein, clopyralid and pyrenzazone The mass ratio of ketonecloba-methyl is 1-35:1. 2. The synergistic herbicidal composition according to claim 1, characterized in that the mass percentage of clopyralid and pentrazone-ethyl in the herbicidal composition is 1-85%. 3. The synergistic herbicidal composition according to claim 2, characterized in that the mass percentage of clopyralid and pyrenzazone-ethyl in the herbicidal composition is 10-80%. 4. The synergistic herbicidal composition according to claim 1, characterized in that it is formulated into any dosage form with clopyralid and pyrentrazone-ethyl as active ingredients and pesticide-approved adjuvants. 5. The synergistic herbicidal composition according to claim 4, characterized in that said dosage form is wettable powder, soluble powder, suspension or granule. 6. The application of the synergistic herbicidal composition of claim 1 in the preparation of herbicides for post-emergence weeding in wheat fields. 7. The use according to claim 6, characterized in that the synergistic herbicidal composition is used in the preparation of herbicides for controlling broad-leaved weeds in wheat fields.