CN112021312A

CN112021312A - Weeding composition containing trifluralin and imazamox

Info

Publication number: CN112021312A
Application number: CN202011087375.8A
Authority: CN
Inventors: 周凤艳; 张勇; 韩云静; 武健; 沈艳; 刘小林
Original assignee: Institute of Plant Protection and Agricultural Products Quality Safety of AAAS
Current assignee: Institute of Plant Protection and Agricultural Products Quality Safety of AAAS
Priority date: 2020-10-13
Filing date: 2020-10-13
Publication date: 2020-12-04
Anticipated expiration: 2040-10-13
Also published as: CN112021312B

Abstract

The invention provides a weeding composition containing prodiamine and imazamox, which comprises active ingredients including prodiamine and imazamox, wherein the mass ratio of the prodiamine to the imazamox is 1-50: 1-10. The weeding composition can be used for preventing and removing annual weeds in the soybean field, and has a remarkable synergistic effect.

Description

Weeding composition containing trifluralin and imazamox

Technical Field

The invention belongs to the field of herbicides, and particularly relates to a herbicidal composition containing prodiamine and imazamox and application thereof.

Background

The prodiamine is a dinitroaniline pre-emergence closed herbicide, and controls sensitive weeds by inhibiting the growth and development of newly-germinated weed seeds. Can be used for preventing and treating various gramineous weeds and broadleaf weeds on lawn, such as annual bluegrass, barnyard grass, crab grass, annual green bristlegrass, Amaranthus retroflexus, chickweed, Curculigo orchioides, purslane, etc. Imazamox is a selective preemergence and postemergence herbicide. Soil treatment, which is caused by contact of weed sprouts or seedlings with the agent and absorption; applying the pesticide after seedling. The weeds are absorbed by the overground part, and the medicament enters the plant body and is accumulated on the part with vigorous growth. Inhibiting growth, and leading to death of weed tissue.

The single use of the herbicide for a long time easily causes the serious drug resistance of the weeds, thereby increasing the application dosage of the herbicide, causing pollution to the environment, and finding the synergistic composition which can improve the weeding effect and reduce the application dosage of the active ingredients is a research and development hotspot. No related literature report of compounding the trifluralin and the imazamox exists in the prior art.

Disclosure of Invention

The invention relates to a weeding composition containing trifluralin and imazamox and application thereof. The specific technical scheme is as follows:

a weeding composition containing trifluralin and imazamox is characterized in that the mass ratio of the trifluralin to the imazamox is 1-50: 1-10. Further, the mass ratio of the prodiamine to the imazamox is 5:1-20: 1.

The preparation of the composition is water dispersible granules, wettable powder, suspending agent and oil suspending agent. The mass percentage of the active ingredients is 5-70%. The mass percentage of the further active ingredients is 20-65%.

When the formulation of the herbicidal composition is wettable powder, it consists of the following components: 5-70% of active ingredients, 0.1-10% of wetting agent, 0.1-10% of dispersing agent and the balance of solid carrier.

When the formulation of the weeding composition is water dispersible granules, the weeding composition consists of the following components: 5-70% of active ingredient, 0.1-10% of wetting agent, 0.1-10% of dispersing agent, 0.1-5% of disintegrating agent, 0.1-5% of thickening agent and the balance of solid carrier.

When the formulation of the herbicidal composition is a suspension concentrate, it consists of the following components: 5-70% of active ingredients, 0.1-10% of wetting agent, 0.1-10% of dispersing agent, 0.1-10% of thickening agent, 0.1-5% of defoaming agent, 0.1-5% of suspension stabilizer, 1-20% of antifreezing agent and the balance of water.

When the formulation of the herbicidal composition is an oil suspending agent, it consists of the following components: 5-70% of active ingredients, 0.1-10% of emulsifier, 0.1-10% of wetting agent, 0.1-10% of dispersing agent, 0.1-10% of thickening agent, 0.1-5% of defoaming agent and the balance of liquid carrier.

The weeding composition is used for preventing and removing weeds in a soybean field, and the weeds are weeds in one year. Furthermore, the weeds are green bristlegrass, wild oat, barnyard grass, large crabgrass, dayflower, purslane and cyperus rotundus.

Compared with the prior art, the invention has the following beneficial effects:

when the prodiamine and the imazamox are mixed for use, the combination effect on the barnyard grass is different under different mixture ratios: when the ammonia trifluralin: when the mass ratio of the imazamox to the imazamox is 5:1-20:1, the CTC value is more than 120, and the synergistic effect is shown. It is known to those skilled in the art that when two active ingredients are used in combination to exhibit a synergistic effect, the dosage of the active ingredients can be significantly reduced, and the occurrence of weed resistance can be slowed down.

The compound composition of the prodiamine and the imazamox has good control effect on weeds such as green bristlegrass, wild oat, barnyard grass, crabgrass, dayflower, purslane and cyperus rotundus in soybean fields, and the control effect is more than 88%.

Detailed Description

The invention will be better understood from the following examples. However, those skilled in the art will readily appreciate that the description of the embodiments is illustrative only and should not be taken as limiting the invention as described in detail in the claims

Formulation example 1

55% aminotrifluralin-imazamox water dispersible granule

50% of prodiamine, 5% of imazamox, 8% of nekal, 7% of lignin calcium sulfonate, 3% of NNO, 4% of urea, 4% of hydroxypropyl cellulose, 3% of white carbon black and the balance of kaolin to 100%.

Formulation example 2

48% amifluralin-imazamox wettable powder

40% of prodiamine, 8% of imazamox, 6% of sodium lignosulfonate, 4% of NNO, 4% of nekal, 4% of white carbon black and the balance of bentonite to 100%.

Biological example 1: indoor determination of bifloran and imazamox by compounding and pairing barnyard grass

The tested weeds: barnyard grass seeds (institute of plant protection and agricultural product quality safety, academy of agricultural sciences, Anhui province).

The test method comprises the following steps: accurately weighing a certain amount of test medicament, adding a small amount of emulsifier and N, N-dimethylformamide for dissolving, preparing a mother solution by using a 0.1% Tween 80 aqueous solution, diluting the liquid medicament by using a 0.1% Tween 80 aqueous solution, setting 6 doses by using a dilution method of the quantity of each medicament, wherein 8 doses are set by using a mixed agent. Wherein the amount of prodiamine is set to 50, 100, 200, 400, 800, 1600 mg/L; the imazamox doses were set to 5, 10, 20, 40, 80, and 160mg/L, and the mixture doses were set to 5, 10, 20, 40, 80, 160, 320, and 640mg/L, with a 0.1% aqueous tween 80 solution containing no drug as a blank.

Adopting a soil irrigation method: the pot with the area of 0.01m2 was filled with a fixed amount of soil to 3/4 of the pot, and then watered from the top of the pot to completely wet the soil to saturation. Uniformly sowing 15-20 weed seeds to be tested on the surface of soil in a pot, covering 0.5-2cm of fine soil according to the size of the seeds, and culturing in a greenhouse. After 24h, pouring 10ml of liquid medicine quantitatively in each pot, repeating the treatment for 4 times, setting blank controls, culturing the treated test material in a greenhouse, and observing the growth condition of the target weeds regularly. After 20 days, the target damage symptoms and the growth inhibition condition are visually observed, the fresh weight of the overground part is weighed, and the toxicity of the medicament on the target weeds is evaluated according to the inhibition rate of the fresh weight of the target. Calculating the toxicity regression curve and co-toxicity coefficient. The co-toxicity coefficient is more than 120, which shows that the two effective substances have synergistic action, the co-toxicity coefficient is between 80 and 120, which shows that the two effective substances have additive action, and the co-toxicity coefficient is less than 80, which shows that the two effective substances have antagonistic action. The measurement results are shown in table 1.

TABLE 1 results of indoor measurements of Amifolin and imazamox on barnyard grass

As is clear from Table 1, the EC50 values (mg/L) for barnyard grass using prodiamine and imazamox alone were 417.15 and 24.20, respectively. When the prodiamine and the imazamox are mixed for use, the combination effect on the barnyard grass is different under different mixture ratios: when the ammonia trifluralin: the CTC value is between 80 and 120 when the mass ratio of the imazamox to the imazamox is 1:20-1:1, and the additive effect is shown. When the ammonia trifluralin: when the mass ratio of the imazamox to the imazamox is 5:1-20:1, the CTC value is more than 120, and the synergistic effect is shown. It is known to those skilled in the art that when two active ingredients are used in combination to exhibit a synergistic effect, the dosage of the active ingredients can be significantly reduced, and the occurrence of weed resistance can be slowed down.

Biological example 2 measurement of field weed efficacy of Amifolin and imazamox compounded soybeans

And (3) test crops: soybean field weeds: green bristlegrass herb, wild oat, barnyard grass, large crabgrass herb, dayflower, purslane and cyperus rotundus.

The application method comprises the following steps: setting 2 medicament treatments, 1 blank control and repeating for 3 times; the area per cell was 50m2, and the random arrangement was made. And (4) carrying out soil spraying treatment by adopting a sprayer. And (5) investigating the weed fresh weight control effect 21d after the application.

And (4) analyzing results: the compound composition of the prodiamine and the imazamox has good control effect on weeds such as green bristlegrass, wild oat, barnyard grass, crabgrass, dayflower, purslane and cyperus rotundus in soybean fields, and the control effect is more than 88%; wherein the total control effect of the preparation example 1 and the preparation example 2 is 88.50 percent and 93.82 percent respectively. The field observation is safe for crops.

Table 3 herbicidal Effect of the compounded preparation on soybean fields

Preparation	Dosage (g a.i./mu)	Total control effect%
			Formulation example 1	12	88.50
Formulation example 2	12	93.82
			CK	-	-

The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that modifications may be made without departing from the invention as claimed in the invention and these modifications are within the scope of the invention.

Claims

1. A weeding composition containing trifluralin and imazamox is characterized in that the mass ratio of the trifluralin to the imazamox is 1-50: 1-10.

2. The weeding composition according to claim 1, wherein the mass ratio of the prodiamine to the imazamox is 5:1-20: 1.

3. A herbicidal composition according to any one of claims 1 to 2, characterized in that the active ingredient is present in an amount of 5 to 70% by weight.

4. A herbicidal composition according to claim 3, characterized in that the active ingredient is present in an amount of 20-65% by weight.

5. A herbicidal composition according to claim 3, wherein the composition is formulated as water dispersible granules, wettable powders, suspensions, oil suspensions.

6. Use of the herbicidal composition according to any one of claims 1 to 5, for controlling weeds in soybean fields, wherein the weeds are annual weeds.

7. Use according to claim 6, wherein the weeds are green bristlegrass, wild oats, barnyard grass, large crabgrass, dayflower, purslane, juncellaria.