CN114982772A

CN114982772A - Ternary weeding composition for alfalfa field

Info

Publication number: CN114982772A
Application number: CN202210556822.2A
Authority: CN
Inventors: 苏旺苍; 孙兰兰; 薛飞; 徐洪乐; 吴仁海
Original assignee: Institute of Plant Protection of Henan Academy of Agricultural Sciences
Current assignee: Institute of Plant Protection of Henan Academy of Agricultural Sciences
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-09-02
Anticipated expiration: 2042-05-20
Also published as: CN114982772B

Abstract

The invention belongs to the technical field of pesticides, and particularly relates to a ternary weeding composition for an alfalfa field. The ternary weeding composition for the alfalfa field comprises the effective components of pyriftalid, bensulfuron methyl and tembotrione in a compounding manner, wherein the mass ratio of the pyriftalid to the bensulfuron methyl to the tembotrione is (4-9): 1: 25-10. After the pyriftalid, the bensulfuron methyl and the tembotrione are compounded, the co-toxicity coefficient is more than 120 in a certain mass ratio range, the synergistic effect is shown, the control effect on weeds such as eclipta prostrata in purple alfalfa fields can be improved, the application dosage of pesticide can be reduced, the environmental pollution and the pesticide residue can be reduced, and the support can be provided for developing novel herbicides.

Description

Ternary weeding composition for alfalfa field

Technical Field

The invention belongs to the technical field of pesticides, and particularly relates to a ternary weeding composition for alfalfa fields.

Background

Alfalfa (Medicago sativa) is a perennial herb of leguminous plants, has the advantages of high yield, rich protein, excellent grass quality, strong biological nitrogen fixation capacity, good palatability and the like, and plays an irreplaceable role in animal husbandry, particularly dairy cattle industry. The weeds in the alfalfa field are serious, particularly the malignant weeds such as eleusine indica, digitaria sanguinalis, eclipta prostrata and cyperus rotundus grow rapidly, the prevention and control are difficult, and the yield and the quality of the alfalfa are seriously influenced. At present, the weeds in the alfalfa field are mainly controlled by chemical agents, such as quizalofop-p-ethyl, imazethapyr, clethodim and the like, but with the gradual increase of the drug resistance of the weeds, the control effect of the existing chemical agents on the weeds is gradually reduced. Although the effect of preventing and removing weeds can be improved by increasing the pesticide spraying dose, the pesticide damage to alfalfa is easy to generate, and the growth of alfalfa is influenced, so that the development of a novel herbicide is necessary.

Pyriftalid (pyriftalid) is a pyrimidine salicylate herbicide developed by syngenta and acts by the mechanism of ALS inhibitors, the herbicidal activity of which derives from the ring-opened salicylic acid. Has high effect of preventing and killing annual gramineous weeds, cyperaceae weeds and partial broad weeds by absorbing roots and stems and leaves.

Bensulfuron-methyl (bensulfuron-methyl) is a sulfonylurea herbicide developed by dupont. Bensulfuron-methyl is a selective systemic herbicide that acts by inhibiting the synthesis of essential amino acids, such as valine, isoleucine, and thereby stopping cell division and plant growth.

Tembotrione, a triketone corn field herbicide developed by bayer, is expressed by a HPPD inhibitor, a chelate that encapsulates fe (ii) into a HPPD ionic group to express activity.

Compounding different pesticide active ingredients is an effective and quick way for developing and researching new pesticides. After being compounded, different pesticide active ingredients usually show three action types: antagonism, additive action and synergism, wherein the formula of synergism is shown, the prevention and treatment effect can be obviously improved, and the application dosage of the pesticide is reduced. The inventor finds that the synergistic effect is shown on the eclipta prostrata when the pyriftalid, the bensulfuron-methyl and the tembotrione are compounded according to a certain mass ratio through indoor tests, and no related report about the compounding of the pyriftalid, the bensulfuron-methyl and the tembotrione exists at present.

Disclosure of Invention

The invention aims to provide a ternary weeding composition for an alfalfa field, which can improve the weed control effect in the alfalfa field and provide support for developing a novel herbicide.

In order to achieve the purpose, the invention provides the following technical scheme:

the ternary weeding composition for the alfalfa field comprises the effective components of pyriftalid, bensulfuron-methyl and tembotrione in a compounding manner, wherein the mass ratio of the pyriftalid to the bensulfuron-methyl to the tembotrione is (4-9): 1: 25-10.

Preferably, the mass ratio of the pyriftalid to the bensulfuron methyl to the tembotrione is 4: 1: 10.

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

after the pyriftalid, the bensulfuron methyl and the tembotrione are compounded, the co-toxicity coefficient is more than 120 in a certain mass ratio range, the synergistic effect is shown, the control effect on weeds such as eclipta prostrata in purple alfalfa fields can be improved, the application dosage of pesticides can be reduced, the environmental pollution and the pesticide residue can be reduced, and the support can be provided for developing novel herbicides.

Detailed Description

The invention will be better understood from the following examples. However, it is easily understood by those skilled in the art that the contents described in the embodiments are only for illustrating the present invention and should not be limited to the invention described in detail in the claims.

Examples1: screening of weed control medicament for alfalfa field

1. The tested weeds: snakehead gut (Eclipta prostrata) seeds are collected in the alfalfa base of Hebograss company, Henan, at the estuary of the garden of the Heji district, Zheng Zhou City.

2. Reagent to be tested: 96% of pyriftalid technical, 96% of bensulfuron methyl technical and 96% of tembotrione technical, which are all sold in the market.

Dissolving the test agent with dimethyl sulfoxide solvent, diluting with 0.1% Tween-80 water solution to obtain single mother liquid, setting multiple groups of mixture ratios, and setting 6 mass concentration gradients for use.

3. The test method comprises the following steps: reference to part 4 of the indoor bioassay test criteria for pesticides NY/T1155.4-2006 herbicide: activity measurement test Stem and leaf spray method

Soaking the weed seeds to be tested for germination until the weed seeds are exposed to the white, uniformly sowing the weed seeds in plastic pots (15cm multiplied by 11cm multiplied by 7cm, the bottoms of the pots are perforated) with 30 grains per pot, covering fine soil 0.5-1cm after sowing, transferring the weed seeds into a greenhouse for conventional culture, and keeping the soil moist; after the seedlings of the weeds emerge regularly, the seedlings are fixed to 20 plants in each pot, when the seedlings of the weeds grow to the 3-leaf stage, a walking spray tower is used for spraying a test solution to stems and leaves of the seedlings of the weeds, each treatment is repeated for 5 times, 0.1% Tween-80 aqueous solution is used as a blank control for treatment, and the treated seedlings are moved into a greenhouse for continuous culture.

Weighing the fresh weight of the overground part of the weeds 14 days after the application of the herbicide, and calculating the fresh weight control effect.

4. And (3) data analysis: DPS software is adopted to carry out data statistical analysis on the liquid medicine concentration logarithm value and the control effect probability value to obtain a toxicity regression equation and ED of the medicament on a target ₅₀ Value, and the co-toxicity coefficient (CTC) was calculated according to the grand cloud method.

5. Measurement results

And evaluating the synergism of the medicament according to the calculated co-toxicity coefficient (CTC), wherein the CTC is not more than 80 and is antagonistic action, the CTC is more than 80 and is less than 120 and is additive action, and the CTC is not less than 120 and is synergistic action, and the results are shown in Table 1.

TABLE 1 toxicity test results of combined cloransulam, bensulfuron methyl and tembotrione on snakehead intestine

As can be seen from Table 1, in the range of 4-9: 1: within the mass ratio range of 25-10, the co-toxicity coefficient of the compound of the pyriftalid and the bensulfuron methyl good tembotrione to the snakehead intestine is 147.90-554.25, and is more than 120, so that the synergistic effect of the compound of the pyriftalid and the bensulfuron methyl good tembotrione to the snakehead intestine prevention and control is shown, particularly, the mass ratio is 4: 1: when the dosage is 10, the co-toxicity coefficient reaches 554.25, and the synergistic effect is particularly obvious.

In conclusion, after the pyriftalid, the bensulfuron methyl and the tembotrione are compounded, the synergistic effect is realized in a certain mass ratio range, the control effect on the eclipta prostrata in the purple alfalfa field can be improved, the reduction of the application dosage of the pesticide is facilitated, the environmental pollution and the pesticide residue are reduced, and the support can be provided for the development of novel herbicides.

The foregoing is only a preferred embodiment of the present invention and modifications, which are within the scope of the invention, will be apparent to those skilled in the art without departing from the principles of the invention.

Claims

1. The ternary weeding composition for the alfalfa field is characterized in that the effective ingredients of the ternary weeding composition are compounded from pyriftalid, bensulfuron-methyl and tembotrione, and the mass ratio of the pyriftalid to the bensulfuron-methyl to the tembotrione is 4-9: 1: 25-10.

2. The ternary herbicidal composition for alfalfa fields as claimed in claim 1, characterized in that the mass ratio of pyriftalid, bensulfuron methyl and tembotrione is 4: 1: 10.