A herbicidal composition comprising trifluralin, acetochlor and thifensulfuron

Abstract

The present application provides a kind of herbicidal composition comprising trifluralin, acetochlor and thifensulfuron-methyl, active ingredients comprising trifluralin, acetochlor and thifensulfuron-methyl, and the mass ratio of trifluralin, acetochlor and thifensulfuron-methyl is 10-30:20-40:0.5-2.The herbicidal composition of the present application can be used for the control of annual weeds in crop fields, and has a significant synergistic effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of herbicides, and particularly relates to a herbicidal composition containing trifluralin, acetochlor and thifensulfuron-methyl and application thereof. BACKGROUND

[0002] Trifluralin is a selective aniline pre-emergence soil treatment agent, which mainly absorbs through the embryo sheath and hypocotyl of weeds, affects the generation and transmission of hormones, inhibits cell division, and causes the death of weeds. Trifluralin is ineffective on weeds that have emerged, and only absorbs the agent during the emergence of the weed seeds after germination to be killed. Trifluralin can effectively prevent annual grass weeds and part of small-grained seed broadleaf weeds, and has a long effective period.

[0003] Acetochlor belongs to an amide herbicide, which enters the plant body to inhibit the synthesis of protease, so that the young shoots and young roots stop growing. The new leaves of grass weeds are curled and shriveled, and other weeds are also shriveled, and the whole plant dies. The leaves of broadleaf weeds are yellow and shriveled, and the whole plant dies.

[0004] Thifensulfuron-methyl belongs to a sulfonylurea herbicide, which is a high-efficiency selective post-emergence stem and leaf treatment agent, and can be used for preventing annual broadleaf weeds in cereal crops. It is mainly absorbed through the leaf surface and root system of weeds and is conducted. Generally, after application, sensitive weeds immediately stop growing, and die after one week. It is suitable for preventing Amaranthus retroflexus, Portulaca oleracea, Fleabane, Polygonum, Chenopodium and other weeds.

[0005] Long-term single use is easy to cause the generation of weed resistance and pollution to the environment, and finding a synergistic composition that can improve the herbicidal effect and reduce the dosage of active ingredients is the research focus of many domestic pesticide companies. There is no related report on the compounding use of trifluralin, acetochlor and thifensulfuron-methyl in the prior art. SUMMARY

[0006] The present application discloses a herbicidal composition containing trifluralin, acetochlor and thifensulfuron-methyl and application thereof, and the herbicidal composition has a significant synergistic effect. The specific technical solutions are as follows:

[0007] A herbicidal composition containing trifluralin, acetochlor and thifensulfuron-methyl, the active ingredients contain trifluralin, acetochlor and thifensulfuron-methyl, and the mass ratio of trifluralin, acetochlor and thifensulfuron-methyl is 10-30:20-40:0.5-2.

[0008] In the herbicidal composition, the mass ratio of trifluralin, acetochlor and thifensulfuron-methyl is preferably 10:40:2, 30:20:0.5, 20:30:1 or 30:40:2. More preferably, the mass ratio of trifluralin to acetochlor is 10:40:2.

[0009] The mass percentage of the active ingredient in the herbicidal composition of the present application is 1-90%. Preferably, the mass percentage of the active ingredient is 20-70%; more preferably, the mass percentage of the active ingredient is 30-60%

[0010] The herbicidal composition of the present application is mixed with common adjuvants in the pesticide industry to prepare any formulation suitable for agricultural use. Suitable formulations include emulsifiable concentrate, water dispersible granule, wettable powder, granule, suspension concentrate, microemulsion, and water emulsion.

[0011] The herbicidal composition of the present application is used for preventing and treating weeds in crop fields.

[0012] The crop of the present application is preferably cotton, rice, corn, soybean, etc. The weeds are annual weeds.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] The combination of trifluralin, acetochlor and thifensulfuron-methyl has significant synergistic effect, which can effectively reduce the dosage of the active ingredient, slow down the development of drug resistance, and reduce environmental pollution.

[0015] The combination of trifluralin, acetochlor and thifensulfuron-methyl can be used for preventing and treating weeds in crops, and has a prevention and treatment effect of about 90% on weeds in the field at a dosage of 50 g a.i. / acre. DETAILED DESCRIPTION

[0016] The present application can be better understood according to the following examples. However, those skilled in the art will readily understand that the content described in the examples is only for illustration of the present application and should not and will not limit the present application described in detail in the claims

[0017] Example 1

[0018] Trifluralin 10%, acetochlor 40%, thifensulfuron-methyl 2%, sodium dodecylbenzenesulfonate 5%, methylene bis naphthalene sulfonic acid sodium 3%, NNO 6%, sodium carboxymethyl starch 2%, xanthan gum 2%, attapulgite to make up 100%. According to the conventional method, trifluralin·acetochlor water dispersible granule with a mass percentage of 52% is prepared.

[0019] Example 2

[0020] Trifluralin 15%, acetochlor 20%, thifensulfuron-methyl 1%, sodium lignosulfonate 4%, methylene bis naphthalene sulfonic acid sodium 2%, kaolin powder 2%, white carbon black 3%, bentonite to make up 100%. According to the conventional method, trifluralin·acetochlor wettable powder with a mass percentage of 36% is prepared.

[0021] Example 3: trifluralin, acetochlor and thifensulfuron-methyl complex on Portulaca oleracea indoor test

[0022] Test weed: Portulaca oleracea seeds, mature seeds collected in the field, stored in the laboratory (check germination rate every 1 month regularly, about 95%).

[0023] Test agent: trifluralin technical, acetochlor technical, thifensulfuron-methyl technical; purchased in the market.

[0024] Test method: The test soil is collected from the field without pesticide. Fill the test soil to 3 / 4 of the flowerpot (9.5 cm in diameter, 8 cm in depth); place the flowerpot in a basin containing water, and the water penetrates from the bottom of the flowerpot to completely wet the soil. A certain amount of Portulaca oleracea seeds are sown in the flowerpot, and cover the soil with 1 cm after sowing. At 24 h after sowing, soil spraying treatment is carried out according to the test design dose by using a belt crop sprayer (spraying pressure 190 kPa, spraying liquid amount 45 L / acre, belt speed 1.48 km / h). The test is set up with 3 replicates. After treatment, the test materials are placed in the greenhouse and managed according to the conventional method. The emergence of test weeds and the response of weeds to pesticides after emergence are observed and recorded. The fresh weight of weeds in each treatment is weighed 30 d after treatment, and the fresh weight inhibition percentage is calculated. The ED50 value of the pesticide is calculated by using DPS software, and the CTC value is calculated according to Sun Yunpei method.

[0025] Result analysis: As shown in Table 1, trifluralin, acetochlor and thifensulfuron-methyl complex show synergistic and additive effects on Portulaca oleracea. Among them, the ratio of trifluralin, acetochlor and thifensulfuron-methyl is 10:40:2, 30:20:0.5, 20:30:1, 30:40:2, which shows synergistic effect, and when the ratio is 10:40:2, the synergistic effect is significant, and the CTC value is greater than 130. The ratio of trifluralin, acetochlor and thifensulfuron-methyl is 5:10:1, 1:1:1, which shows additive effect. Within the test ratio range, the ternary complex composition does not show antagonistic effect.

[0026] Table 1: Results of ternary complex composition on Portulaca oleracea indoor test

[0027]

[0028]

[0029] Example 4: field efficacy test

[0030] Test agent: examples 1-4; 480 g / L trifluralin emulsion, 40% acetochlor emulsion, 75% thifensulfuron-methyl water dispersible granule.

[0031] Test crop: soybean field weeds: Echinochloa crus-galli, Digitaria sanguinalis, Portulaca oleracea, Commelina communis, Xanthium.

[0032] Application method: 5 pesticide treatments, 1 blank control, 3 repetitions; each plot area is 20 m2, random arrangement. Soil spray treatment is carried out by using a sprayer. The fresh weight of weeds is investigated 30 days after application.

[0033] From table 2, it can be seen that when the application amount of the compound preparation is 50 g a.i. / mu, the total control effect on the weeds of soybean field, such as barnyardgrass, dogtailgrass, common purslane, bristlegrass and common cocklebur, is about 90%. Through comparison with single agents, it is found that the ternary composition can significantly improve the weeding effect, effectively reduce the application amount of active ingredients, and improve the control effect.

[0034] Table 2: weeding effect of the compound preparation on soybean field weeds

[0035]

[0036]

[0037] The above merely describes the preferred embodiments of the present application, and for those skilled in the art, proper modifications can be made without departing from the raw materials of the present application, and these modifications are also within the protection scope of the present application.

Claims

1. A herbicidal composition comprising trifluralin, acetochlor, and thifensulfuron, characterized in that, The active ingredients include trifluralin, acetochlor, and thifensulfuron, and the mass ratio of trifluralin, acetochlor, and thifensulfuron is 10:40:

2.

2. The herbicidal composition according to claim 1, characterized in that, The active ingredient content ranges from 1% to 90% by mass.

3. The herbicidal composition according to claim 2, characterized in that, The active ingredient content is 20-70% by mass.

4. The herbicidal composition according to claim 2, characterized in that, The herbicidal composition is mixed with common pesticide excipients to prepare any formulation suitable for agricultural use.

5. The herbicidal composition according to claim 4, characterized in that, The formulations are emulsifiable concentrates, water-dispersible granules, wettable powders, granules, suspensions, and microemulsions.

6. Use of the herbicidal composition according to any one of claims 1-5 for controlling weeds in crop fields.

7. The use of the herbicidal composition according to claim 6, characterized in that, The weeds mentioned are annual grasses and broadleaf weeds.

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