CN112021319B

CN112021319B - Weeding composition containing pentoxazone and dithiopyr

Info

Publication number: CN112021319B
Application number: CN202011082250.6A
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: HEFEI XINGYU CHEMICAL Co.,Ltd.
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2021-10-12
Anticipated expiration: 2040-10-12
Also published as: CN112021319A

Abstract

The invention provides a weeding composition containing pentoxazone and dithiopyr, wherein the active ingredients comprise pentoxazone and dithiopyr, and the mass ratio of the pentoxazone to the dithiopyr is 1-20: 1-20. The weeding composition can be used for preventing and removing annual weeds in the paddy field and has obvious synergistic effect.

Description

Weeding composition containing pentoxazone and dithiopyr

Technical Field

The invention belongs to the field of herbicides, and particularly relates to a weeding composition containing pentoxazone and dithiopyr and application thereof.

Background

Pentoxazone is a novel oxazolidinedione herbicide; the pentoxazone has a wide control spectrum, and has good control effects on various annual weeds in paddy fields such as barnyard grass, monochoria vaginalis, water chestnuts, stranguria, sedge, part of sedge weeds and the like. Dithiopyr is a pyridine carboxylic acid herbicide; can prevent and kill off annual weeds such as barnyard grass, monochoria vaginalis, cyperus rotundus, herba arthrodii, alisma angustifolium and the like. The herbicidal activity of the herbicide is not affected by the change of environmental factors, and the herbicide is safe to rice and has a lasting period of 80 days.

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. In the prior art, no related literature report on compounding pentoxazone and dithiopyr exists.

Disclosure of Invention

The weeding composition containing pentoxazone and dithiopyr and the application thereof have obvious synergistic effect. The specific technical scheme is as follows:

a weeding composition containing pentoxazone and dithiopyr is characterized in that the mass ratio of the pentoxazone to the dithiopyr is 1-20: 1-20. Further, the mass ratio of the pentoxazone to the dithiopyr is 1:8-12: 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 paddy fields, and the weeds are weeds in one year. Furthermore, the weeds are barnyard grass, monochoria vaginalis, herba jieseniae and cyperus rotundus.

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

after the pentoxazone and the dithiopyr are mixed for use, the dithiopyr has different combined effects on the monochoria vaginalis in different proportions: when pentoxazone: when the mass ratio of the dithiopyr to the dithiopyr is 1:8-12:1, 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 pentoxazone and dithiopyr compound composition has good control effect on weeds in rice fields such as barnyard grass, monochoria vaginalis, herba jieyiae, and cyperus rotundus, and the control effect is more than 90%.

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

50% cyclopentadione-dithiopyr water dispersible granule

25% of pentoxazone, 25% of dithiopyr, 8% of nekal, 5% of polycarboxylate, 5% of calcium lignosulfonate, 3% of urea, 3% of hydroxypropyl cellulose, 4% of white carbon black and the balance of kaolin to 100%.

Formulation example 2

40% cyclopentadione-dithiopyr wettable powder

35% of pentoxazone, 5% of dithiopyr, 4% of calcium dodecyl benzene sulfonate, 6% of sodium salt of a naphthalene sulfonic acid formaldehyde condensate, 4% of nekal, 4% of white carbon black and the balance of kaolin to 100%.

Biological example 1: indoor determination of pentoxazone and dithiopyr compound pairing monochoria vaginalis

The tested weeds: monochoria vaginalis seeds (institute for 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 medicinal liquid by using a 0.1% Tween 80 aqueous solution, and setting 6 doses by using a dilution method of each medicament time. Wherein the pentoxazone dosage is set at 2.5, 5, 10, 20, 40, 80 mg/L; the dithiopyr dose was set to 5, 10, 20, 40, 80, 160mg/L and the mixture dose was set to 2.5, 5, 10, 20, 40, 80mg/L, with a 0.1% aqueous tween 80 solution without 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 indoor assay results for pentoxazone and dithiopyr compound paired monochoria vaginalis

As can be seen from Table 1, the EC50 values (mg/L) for monochoria vaginalis were 18.22 and 30.25 for pentoxazone and dithiopyr alone, respectively. After the pentoxazone and the dithiopyr are mixed for use, the dithiopyr has different combined effects on the monochoria vaginalis in different proportions: when pentoxazone: when the mass ratio of the dithiopyr to the dithiopyr is 1:12, the CTC value is between 80 and 120, and the addition effect is shown. When pentoxazone: when the mass ratio of the dithiopyr to the dithiopyr is 1:8-12:1, 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 determination of herbicide effects of pentoxazone and dithiopyr compounded paddy field weeds

And (3) test crops: weeds in rice fields: barnyard grass, monochoria vaginalis, jiejia burclover and abnormal sedge.

The application method comprises the following steps: setting 2 medicament treatments, 1 blank control and repeating for 3 times; the area per cell was 40m2, randomly arranged. And (4) carrying out soil spraying treatment by adopting a sprayer. And (5) investigating the weed fresh weight control effect 30 days after the application of the herbicide.

And (4) analyzing results: the pentoxazone and dithiopyr compound composition has good control effect on weeds in rice fields such as barnyard grass, monochoria vaginalis, herba jiesensis and abnormal sedge, and the control effect is more than 90%; wherein the total control effect decibels of the preparation example 1 and the preparation example 2 are 90.65 percent and 95.40 percent. The field observation is safe for crops.

Table 3 herbicidal Effect of the compounded preparations on paddy fields

Preparation	Dosage (ga.i./mu)	Total control effect%
			Formulation example 1	4	90.65
Formulation example 2	4	95.40
			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 pentoxazone and dithiopyr is characterized in that the mass ratio of the pentoxazone to the dithiopyr is 1:8-12: 1.

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

3. A herbicidal composition according to claim 2, characterized in that the active ingredient is present in an amount of 20-65% by weight.

4. A herbicidal composition according to claim 2, characterized in that the formulation of the composition is water dispersible granules, wettable powder, suspension, oil suspension.

5. Use of the herbicidal composition according to any one of claims 1 to 4 for controlling weeds in paddy fields, wherein the weeds are monochoria vaginalis.