CN112806381A

CN112806381A - Weeding composition containing metamifop and imazamox

Info

Publication number: CN112806381A
Application number: CN202110147804.4A
Authority: CN
Inventors: 郭晓刚; 徐艳春
Original assignee: Anhui Xitian Biotechnology Co ltd
Current assignee: Anhui Xitian Biotechnology Co ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2021-05-18

Abstract

The invention provides a weeding composition containing metamifop and imazamox, which comprises active ingredients of metamifop and imazamox, wherein the mass ratio of the metamifop to the imazamox is 0.1-10: 0.1-20. The weeding composition can be used for preventing and removing annual weeds in crop fields and has obvious synergistic effect.

Description

Weeding composition containing metamifop and imazamox

Technical Field

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

Background

Metamifop is an aryloxy phenoxy propionic acid internal absorption conduction type herbicide for preventing and killing annual gramineous weeds, the action mechanism of the metamifop is an acetyl coenzyme A carboxylase (ACCase) inhibitor, and the synthesis of plant fatty acid can be inhibited. Is used for preventing and killing various gramineous weeds such as barnyard grass, moleplant seed and the like in the stem and leaf treatment of the paddy field.

The imazamox is an imidazolinone herbicide, and can well prevent and control a plurality of annual weeds in a field in a lasting way; after foliar treatment, sensitive weeds quickly yellow and growth stops, eventually leading to death or no longer being competitive. Can well prevent and kill off and control various gramineous and broadleaf weeds with lasting effect, such as: green bristlegrass, wild oat, barnyard grass, crab grass, wild millet, cyperus heterophyllus, cyperus rotundus, amaranth, polygonum, black nightshade, chenopodium album, purslane, cocklebur, shepherd's purse, piemarker, buckwheat tendril, dayflower and the like.

The chemical agent is easy to cause the drug resistance of weeds after being singly used for a long time, causes pollution to the environment, and the research and development of the synergistic composition which can improve the weeding effect and reduce the application dosage of active ingredients is the key point of the research and development of a plurality of pesticide companies in China. In the prior art, no report is provided about the compound use of metamifop and imazamox.

Disclosure of Invention

The weeding composition containing metamifop and imazamox and the application thereof have a remarkable synergistic effect. The specific technical scheme is as follows:

the active ingredients of the weeding composition comprise metamifop and imazamox, and the mass ratio of the metamifop to the imazamox is 0.1-10: 0.1-20. Preferably, the mass ratio of the metamifop to the imazamox is 0.1-5: 0.1-10. More preferably, the mass ratio of the metamifop to the imazamox is 0.5-4:0.5-1, 2:1.5 or 4: 1.5.

The weeding composition comprises 5-85% of active ingredients in percentage by mass. Preferably, the mass percentage of the active ingredients is 15-65%.

The weeding composition is mixed with common auxiliary materials on pesticides to prepare any preparation suitable for agriculture. Preferably, the preparation is missible oil, water dispersible granules, wettable powder, granules and dispersible oil suspending agent.

The weeding composition is used for preventing and removing weeds in crop fields. Preferably, the crop is rice or soybean. Preferably the weeds are annual weeds: barnyard grass, moleplant seed, purslane and the like.

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

the composition has different combined effects when the metamifop and the imazamox are compounded, and when the mass ratio of the metamifop to the imazamox is 0.5-4:0.5-1, 2:1.5 and 4:1.5, the composition has obvious synergistic effect on the moleplant seeds; can effectively reduce the application dosage of active ingredients and slow down the generation of drug resistance of weeds.

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 130% Oxazolecarboxamide Methoxyfenapyr Water dispersible granules

15% of metamifop, 15% of imazamox, 5% of sodium lignin sulfonate, 4% of sodium dodecyl sulfate, 6% of NNO, 3% of urea, 3% of carboxymethyl cellulose, 2% of white carbon black and 100% of kaolin. The metamifop-imazamox water dispersible granule with the mass percentage of 30 percent is prepared according to a conventional method.

Example 225% Oxazolecarboxamide Methoxyfenapyr Water dispersible granules

20% of metamifop, 5% of imazamox, 5% of sodium lignin sulfonate, 6% of sodium dodecyl sulfate, 4% of NNO, 4% of urea, 3% of carboxymethyl cellulose, 3% of white carbon black and the balance of kaolin to 100%. The metamifop-imazamox water dispersible granule with the mass percentage of 25 percent is prepared according to a conventional method.

Example 330% Oxazolecarboxamide-Methoxyfenapyr wettable powder

10% of metamifop, 20% of imazamox, 5% of nekal, 2% of NNO, 5% of sodium dodecyl benzene sulfonate, 4% of white carbon black and 100% of kaolin. The metamifop-imazamox wettable powder with the mass percentage of 30 percent is prepared according to a conventional method.

Example 435% Oxazolecarboxamide-Methoxyfenapyr wettable powder

25% of metamifop, 10% of imazamox, 6% of nekal, 4% of NNO, 6% of sodium dodecyl benzene sulfonate, 3% of white carbon black and the balance of kaolin to 100%. The metamifop-imazamox wettable powder with the mass percentage of 35 percent is prepared according to a conventional method.

Example 5: compound pairing of metamifop and imazamox and indoor determination of moleplant

The tested weeds: semen Euphorbiae, field collection of non-cultivated land, the seed is preserved in the laboratory for subsequent use.

Reagent to be tested: metamifop and imazamox; is commercially available.

The test method comprises the following steps: sowing 25-30 seeds of Gramineae weed Euphorbiae Lathyridis semen in square plastic plant cultivation flowerpot with specification of 10 × 10 × 10cm, covering soil 0.5cm after sowing, pressing, spraying water, and culturing in greenhouse by conventional method. And (3) carrying out stem and leaf spraying treatment by using a spraying machine according to the experimental design dosage when 20 weeds are planted in the 2-leaf stage of the weeds and the weeds are planted in the 3-4-leaf stage. The experiment was set up to 4 replicates. And (3) after the test material is treated, the test material is placed in a greenhouse to be managed according to a conventional method, the reaction condition of the tested weed to the medicament is observed and recorded, the fresh weight of the overground part of each treated weed is weighed 10 days after the treatment, and the fresh weight inhibition percentage is calculated.

And (3) evaluating the synergistic effect: and calculating the fresh weight inhibition rate (E) and the theoretical fresh weight inhibition rate (E0) of the weeds among different treatments of single-agent and binary compound. The combined action type of the binary compound herbicide was evaluated. When the E-E0 is more than 10 percent, the two herbicides have synergistic effect after being compounded; when E-E0 < -10%, the two herbicides have antagonism; values of E-E0 between-10% and 10% are additive effects.

The observed fresh weight inhibition ratio (E) ═ control fresh weight-treated fresh weight ÷ control fresh weight × 100%. Theoretical fresh weight inhibition ratio (E0) ═ X + Y-XY/100

And (3) analyzing a test result:

as can be seen from table 1, the single use of metamifop and imazamox has low control effect on caper euphorbia seed, for example, the control effect on caper euphorbia seed is only 62.05% when 4g of metamifop is used for each acre; the control effect of the imazamox on the moleplant seeds is only 55.40% when 1.5g of the imazamox is a.i./mu; when the two are used in combination, the control effect on the moleplant seed is obviously improved.

As can be seen from Table 3, by comparing the actual inhibition rate and the theoretical inhibition rate of the two herbicides under different combinations, the combination of metamifop and imazamox has different combined effects. When the ratio of the metamifop to the imazamox is 0.5: 1.5 the composition exhibited an additive combination effect on Euphorbiae Lathyridis semen; the other mixture ratio is 0.5-4:0.5-1, 2:1.5 and 4:1.5, which shows the technical effect of synergy.

Table 1 shows that the inhibition rate of the combination of metamifop and imazamox on the fresh weight of moleplant seed is high in different proportions

Note: all the above values are actual measured values

Table 2 shows the theoretical fresh weight inhibition rate of molazalea and imazamox in different ratios

Note: "-" indicates the absence of a combination of single agents

TABLE 3 Combined action value of metamifop and imazamox on moleplant seed at different ratios (E-E0)

Note: "-" indicates the absence of a combination of single agents

Example 6 measurement of drug efficacy of metamifop and imazamox compounded on weeds in paddy field

Test agents: examples 1-4 formulations of the present configurations

Test crop fields and weed species thereof: directly sowing rice in a field; and (3) field weeds: barnyard grass, semen Euphorbiae, and herba Portulacae.

The application method comprises the following steps: 4 drug treatments were set, 1 blank control, repeated 3 times; the area per cell was 40m2, randomly arranged. Spraying stem and leaf. And (5) investigating the weed fresh weight control effect 14d after the application.

And (3) analyzing a test result:

the dosage forms prepared in the examples 1-4 have the total control effect on the weeds in the paddy field of more than 83% when the dosage of the active ingredients is 4.5g a.i./mu. Can effectively reduce the application dosage of active ingredients, slow down the generation of drug resistance of weeds and have obvious synergistic effect.

Table 4 herbicidal Effect of the compounded preparations on paddy field

Preparation	Dosage g a.i./mu	Total control effect%
			Example 1	4.5	86.31
Example 2	4.5	83.40
			Example 3	4.5	88.05
Example 4	4.5	85.00
			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 metamifop and imazamox is characterized in that active ingredients comprise the metamifop and the imazamox, and the mass ratio of the metamifop to the imazamox is 0.1-10: 0.1-20.

2. The weeding composition according to claim 1, wherein the mass ratio of metamifop to imazamox is 0.1-5: 0.1-10.

3. The herbicidal composition as claimed in claim 2, wherein the mass ratio of metamifop to imazamox is 0.5-4:0.5-1, 2:1.5 or 4: 1.5.

4. A herbicidal composition according to any one of claims 1 to 3, characterized in that the active ingredient is present in an amount of 5 to 85% by weight.

5. A herbicidal composition according to claim 4, characterized in that the active ingredient is present in an amount of 15-65% by weight.

6. The weeding composition according to claim 4, wherein the weeding composition is mixed with the common auxiliary materials on the pesticides to prepare any preparation suitable for agriculture.

7. A herbicidal composition as claimed in claim 6, wherein said formulation is selected from the group consisting of emulsifiable concentrate, water dispersible granules, wettable powder, granules, and dispersible oil suspension.

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

9. Use of a herbicidal composition according to claim 8, wherein the crop is preferably rice or soybean.

10. Use of a herbicidal composition according to claim 8, characterized in that the weeds are annual weeds.