CN111771892A

CN111771892A - Weeding composition containing topramezone, mesotrione and terbuthylazine

Info

Publication number: CN111771892A
Application number: CN202010799362.7A
Authority: CN
Inventors: 李冬兵; 王霞; 郑秀
Original assignee: Hefei Shangbang Plant Protection Technology Co ltd
Current assignee: Anhui Golden Land Biotechnology Co.,Ltd.
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2020-10-16
Anticipated expiration: 2040-08-11
Also published as: CN111771892B

Abstract

The invention provides a weeding composition containing topramezone, mesotrione and terbuthylazine, wherein the active ingredients comprise topramezone, mesotrione and terbuthylazine, and the mass ratio of topramezone, mesotrione and terbuthylazine is 5-15:40-60: 110-. The weeding composition can be used for preventing and removing annual weeds in crop fields and has obvious synergistic effect.

Description

Weeding composition containing topramezone, mesotrione and terbuthylazine

Technical Field

The invention belongs to the field of herbicides, and particularly relates to a weeding composition containing topramezone, mesotrione and terbuthylazine and application thereof.

Background

Topramezone is a herbicide with systemic conduction action and can be absorbed by the leaves, roots and stems of plants. Has a wider weed control spectrum, can prevent and kill annual gramineous weeds and broadleaf weeds: crab grass, cockspur grass, eleusine indica, green bristlegrass, broomcorn millet, quinoa, polygonum, abutilon, amaranthus retroflexus, ragweed, stramonium, cyathula officinalis, purslane, cocklebur, black nightshade and the like. Mesotrione is a hydroxyphenylpyruvate dioxygenase inhibitor, has a stem and leaf treatment herbicide with a unique action mechanism, and can be used for preventing and removing broadleaf weeds and part of gramineous weeds: amaranthus retroflexus, herba Portulacae, Chenopodium album, Polygonum hydropiper, Commelina communis, Echinochloa crusgalli, and crab grass. The terbuthylazine selective systemic conductive herbicide belongs to the class of systemic conductive herbicides, and can be used for preventing and removing annual gramineous weeds, nutgrass flatsedge and certain broadleaf weeds in corn fields.

Patent application CN201310349530.2 discloses a topramezone and terbuthylazine compounded herbicide, which comprises an oil suspending agent mainly prepared from topramezone, terbuthylazine, an auxiliary agent and a solvent, wherein the mass percent of the topramezone is 1-60%, the mass percent of the terbuthylazine is 1-40%, and the sum of the mass percent of the topramezone and the terbuthylazine is 2-90% of the total mass of the herbicide. Patent application CN201410405052.7 discloses a topramezone-containing cornfield herbicide composition, which consists of topramezone, mesotrione and atrazine in a weight ratio of (0.5-40) to (1-40) to (5-80); the sum of the contents of topramezone, mesotrione and atrazine is 5-85% of the total weight of the composition. In both of these patents, the technical solution of the present application is relatively close, but the ternary composition of the present invention is not disclosed. The research and development of numerous agricultural chemical companies in China are focused on finding synergistic compositions capable of improving the weeding effect and reducing the application dosage of active ingredients.

Disclosure of Invention

The weeding composition containing topramezone, mesotrione and terbuthylazine and the application thereof have a remarkable synergistic effect. The specific technical scheme is as follows:

a weeding composition containing topramezone, mesotrione and terbuthylazine is characterized in that active ingredients comprise topramezone, mesotrione and terbuthylazine, and the mass ratio of topramezone, mesotrione and terbuthylazine is 5-15:40-60: 110-. The preferable mass ratio of topramezone, mesotrione and terbuthylazine is 5-15:40-50: 110-220. More preferably, the mass ratio of topramezone, mesotrione and terbuthylazine is 15:50: 110.

The weeding composition is characterized in that the content of the active ingredients in the topramezone is 1-80% by mass. The content of the active ingredients in percentage by mass is preferably 20 to 60 percent.

The weeding composition is characterized in that the weeding composition is mixed with common auxiliary materials on pesticides to prepare a preparation suitable for agriculture. The preferable preparation is missible oil, water dispersible granules, wettable powder, granules, suspending agents and microemulsion.

The weeding composition is used for preventing and removing weeds in crop fields. Preferably the weeds are annual grasses and broadleaf weeds. Preferably, the crop field is a corn field.

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

when the mass ratio of topramezone to mesotrione to terbuthylazine is 5-15:40-50:110-220, the E-E0 value of the large crabgrass is more than 10 percent, which shows obvious synergistic effect; has no antagonistic effect. Can reduce the dosage of active ingredients and slow down the generation of drug resistance.

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

Example 1: indoor determination of topramezone, mesotrione and atrazine compound pair weeds

Reagent to be tested: topramezone technical, mesotrione technical and terbuthylazine technical; are all commercially available.

The tested weeds: the grass family weeds are large crabgrass and eleusine indica; the weed seeds are collected in the test field.

The test method comprises the following steps:

the preparation method comprises the steps of weighing a certain amount of original medicine according to the dosage required by the test, dissolving the original medicine with a small amount of acetone to prepare a high-concentration mother solution, storing the mother solution in a refrigerator at 0-4 ℃, diluting the mother solution to the required concentration by using a Tween 80 aqueous solution with the mass fraction of 0.1% during the test, and using a Tween 80 aqueous solution with the mass fraction of 0.1% and the same amount of acetone but without containing topramezone and the medicine as a blank control. The mixture of the two medicaments is prepared by the same method.

The soil for weed cultivation test is special soil for test collected from land without drug. Filling the flowerpot 3/4 with soil special for the test; the flowerpot is placed in a pot containing water, and the water permeates from the bottom of the flowerpot, so that the soil is completely wetted. Accelerating germination of the weed seeds to be tested in an incubator at 25 ℃, selecting the weed seeds with uniform exposure to the white, sowing the weed seeds into flowerpot pots, covering fine soil to just cover the weed seeds, and culturing in a controllable sunlight greenhouse with 25 weed seeds per pot. The culture conditions are 25-35 ℃ in the daytime, 18-25 ℃ in the night and 65-75% of relative humidity.

In all the experiments of the pesticide application mode, an automatic control pesticide spraying system is adopted to carry out stem leaf spraying treatment on weeds, a fan-shaped spray head is adopted, the spraying pressure is 270kPa, the liquid spraying amount is 40mL/m2, and the distance between the spray head and a plant is 50 cm.

And (3) determining the seedling fixation when the weeds to be tested grow to 2-3 leaves by indoor combined weeding effect, carrying out stem and leaf spraying treatment when 15 weeds are planted in each pot and the weeds grow to 3 leaves. Each treatment was repeated 4 times. Continuously culturing under greenhouse condition after the medicament treatment, weighing the fresh weight of the overground part 21 days after the treatment, and calculating the inhibition ratio of each fresh weight. Fresh weight inhibition/% (fresh weight of control weed-fresh weight of treated weed)/fresh weight of control weed) x 100

The Gowing method is adopted to judge the type of the combined weeding effect. The theoretical control effect (E0) after mixing is E0 ═ X + Y (100-X)/100, and X, Y in the formula is the measured control effect (%) of each of the two single agents. The actual control effect after mixing is represented by E. When E-E0 is between-10% and 10%, it is additive, when E-E0 is greater than 10%, it is synergistic, and when E-E0 is less than-10%, it is antagonistic.

TABLE 1 Combined Effect of topramezone, mesotrione and terbuthylazine on a test crab

The results of the herbicidal activity of the topramezone, mesotrione and terbuthylazine single and mixed agents on large crabgrass are shown in table 1. Under the condition that the effective dose of the topramezone is 5-15 g/hectare, the fresh weight inhibition rate of the topramezone to large crabgrass is 27.4-55.6%; under the condition that the effective dose of the mesotrione is 40-60 g/hectare, the fresh weight inhibition rate of the mesotrione to large crabgrass is 29.4-47.2%; under the condition that the effective dose of the terbuthylazine is 110-330 g/ha, the fresh weight inhibition rate of the terbuthylazine on the large crabgrass is 21.9-44.6%.

The evaluation result of the Gowing method shows that the E-E0 value of the compound combination of topramezone, mesotrione and terbuthylazine to crabgrass is 9.6-17.3%, which indicates that the compound combination of topramezone, mesotrione and terbuthylazine has synergism or addition effect on crabgrass prevention and treatment, wherein the E-E0 value of topramezone, mesotrione and terbuthylazine is more than 10% when the mass ratio of topramezone, mesotrione and terbuthylazine is 5-15:40-50: 110-; has no antagonistic effect.

TABLE 2 Combined Effect of ternary combinations on the grass of Reynoutria tested

The results of the herbicidal activity of the individual and mixed agents on goosegrass herb are shown in Table 2. Under the condition that the effective dose of the topramezone and the terbuthylazine is 15+110 g/hectare, the fresh weight inhibition rate of the goosegrass is 65.4 percent; the fresh weight inhibition rate of the clethodim to the eleusine indica is 35.8-46.1% under the condition that the effective dose of the mesotrione is 40-50 g/hectare. The evaluation result of the Gowing method shows that: the mesotrione can obviously improve the control effect of the topramezone and terbuthylazine compound composition, the E-E0 value is more than 10 percent, and the mesotrione has obvious synergistic effect. Has no antagonistic effect.

Example 2 field efficacy assay

Reagent to be tested: 35% of topramezone-mesotrione-terbuthylazine suspending agent (3% of topramezone, 10% of mesotrione, 22% of terbuthylazine, 16015% of pesticide emulsion, 22017% of pesticide emulsion, NNO 2%, 4% of magnesium aluminum silicate, 2% of ethylene glycol, 3% of sodium benzoate, 4% of bentonite and deionized water to make up 100%.

And (3) test crops: corn field, field weeds: barnyard grass, Eleusine crabgensis, and herba Portulacae.

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. Spraying stem and leaf with sprayer. And (5) investigating the weed fresh weight control effect 21d after the application.

TABLE 3 herbicide control effect of mesotrione and terbuthylazine mixed preparation on corn field

Under the condition that the effective dose is 120-160 g/ha, the total fresh weight inhibition rate of the compound preparation on the weeds in the corn field is more than 90 percent. The field observation is safe for corn.

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 topramezone, mesotrione and terbuthylazine is characterized in that active ingredients comprise topramezone, mesotrione and terbuthylazine, and the mass ratio of topramezone, mesotrione and terbuthylazine is 5-15:40-60: 110-.

2. The weeding composition according to claim 1, wherein the mass ratio of topramezone, mesotrione and terbuthylazine is 5-15:40-50: 110-220.

3. A herbicidal composition according to any one of claims 1 to 2, characterized in that the content of active ingredient is 1 to 80% by mass of topramezone.

4. A herbicidal composition according to claim 3, wherein the content of topramezone in the active ingredient is from 20 to 60% by mass.

5. A herbicidal composition according to claim 3, characterized in that it is formulated in agriculturally suitable form in admixture with agrochemically customary auxiliaries.

6. A herbicidal composition according to claim 5, wherein said formulation is selected from the group consisting of emulsifiable concentrates, water dispersible granules, wettable powders, granules, suspensions, and microemulsions.

7. Use of the herbicidal composition according to claims 1 to 6 for controlling weeds in crop fields.

8. Use of a herbicidal composition according to claim 7, characterized in that the weeds are annual grasses and broadleaf weeds.

9. Use of a herbicidal composition according to claim 7, characterized in that the crop field is a corn field.