Herbicidal composition containing caprylic acid and application thereof

Abstract

The invention provides a herbicide composition containing caprylic acid, which comprises the following active ingredients: caprylic acid and pinoxaden, and the weight ratio of caprylic acid to pinoxaden is (15: 1)-(5: 1). The weeding composition can be used for preventing and controlling annual gramineous weeds of wheat. The herbicide composition disclosed by the invention has a remarkable synergistic effect, and can effectively reduce the use dosage of active ingredients and delay the generation of drug resistance.

Description

Technical Field

[0001] The invention belongs to the field of pesticides, and particularly relates to a weed killing composition containing caprylic acid and pinoxaden and application thereof. Background Art

[0002] Wheat is one of the important food crops in my country, and chemical weed control in wheat fields is the most important technical measure for wheat cultivation. Due to continuous cropping all year round, mechanized long-distance operations, and repeated use of the same pesticides, the number of weed species in wheat fields has increased, drug resistance has increased, and the control effect has deteriorated. There are even regional resistant weeds and local dominant weeds, which brings certain difficulties to chemical weed control.

[0003] Caprylic acid, also known as n-octanoic acid, has a molecular formula of C 8 H 16 O 2 Caprylic acid is widely found in nutmeg, lemongrass, apple, coconut oil, wine, hops, etc. Caprylic acid can be extracted from coconut oil by volatile fatty acid fractionation. Caprylic acid is a highly active and fast-acting herbicide with a wide spectrum of weed control. It is a herbicide-killing active substance and has the potential to be developed into a new herbicide to replace paraquat and glyphosate.

[0004] Pinoxaden belongs to the new phenylpyrazoline herbicide, and its mechanism of action is acetyl coenzyme A carboxylase (ACCase) inhibitor. It will cause the weed fatty acid synthesis to be blocked, stop the cell growth and division, destroy the lipid structure of the cell membrane, and lead to the death of the weed. It has systemic conductivity and is mainly used to control annual grass weeds. It can effectively control most annual grass weeds such as wild oats, ryegrass, barnyard grass, foxtail grass, and black foxtail.

[0005] Long-term use of a single herbicide will lead to the occurrence of resistant weeds. The combined use of herbicides, i.e., mixed use or mixing, is one of the effective ways to solve the problem of resistant weeds. Scientific and reasonable chemical herbicide mixing has the characteristics of expanding the weed control spectrum, improving the weed control effect, reducing the dosage, reducing the damage of the herbicide, reducing the residue, delaying and controlling the occurrence and development of resistant weeds, etc. Therefore, the combination of pesticides with different action mechanisms is a research hotspot in the current pesticide field. There is no literature report on the mixed use of caprylic acid and pinoxaden in the existing technology. Summary of the invention

[0006] The present invention provides a herbicide composition with synergistic effect, which has the characteristics of good weed control effect, reduced usage amount and usage frequency of chemical pesticides, and low resistance to pesticides.

[0007] A herbicide composition containing caprylic acid, wherein the active ingredients are caprylic acid and pinoxaden, the weight ratio of caprylic acid to pinoxaden is 15:1-5:1; preferably, the weight ratio of caprylic acid to pinoxaden is 10:1-5:1; and preferably, the weight ratio of caprylic acid to pinoxaden is 5:1.

[0008] The herbicidal composition can be prepared into a pesticide-acceptable formulation, wherein the total weight of caprylic acid and pinoxaden in the formulation accounts for 5%-80% of the total formulation mass; preferably, the total weight of caprylic acid and pinoxaden in the formulation accounts for 10%-60% of the total formulation mass.

[0009] The herbicidal composition is in the form of emulsifiable concentrate, suspension concentrate, or dispersible oil suspension concentrate, preferably a dispersible oil suspension concentrate.

[0010] The herbicidal composition is used for preventing and controlling weeds in crops, wherein the crops are wheat and the weeds are grass weeds.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] (1) There is no conflict between caprylic acid and pinoxaden when mixed together, and the synergistic effect is obvious.

[0013] (2) It can significantly reduce the use of pesticides, reduce costs, reduce the amount of pesticide residues on crops, and reduce environmental pollution; DETAILED DESCRIPTION

[0014] The specific implementation modes of the present invention are described in detail below in conjunction with the embodiments, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0015] Example 1: Indoor toxicity test of caprylic acid and pinoxaden combined to wild oats.

[0016] Test object: Wild oats were used as the test weeds. They were collected from the field. A number of mature and full seeds from the previous year were taken for later use.

[0017] Test agents: caprylic acid technical, pinoxaden technical. Weigh a certain amount of technical according to the required dosage of the test, dissolve it with a small amount of organic solvent, and prepare a high-concentration mother solution. During the test, dilute it with a 0.1% Tween 80 aqueous solution to the required concentration. A 0.1% Tween 80 aqueous solution with an equal amount of organic solvent but without the agent is used as a blank control. Prepare a mixture of the two agents in the same way.

[0018] Test method: Put the test soil into a plastic pot with a diameter of 8.5 cm and a height of 10 cm; place the plastic pot in a tray filled with water, and let the water penetrate from the bottom of the pot to completely wet the soil. Germinate the test weed seeds in an incubator at 25°C, select the weed seeds that are evenly white and sow them in the plastic pot, cover them with fine soil to just cover the weed seeds, sow 30 weed seeds in each pot, and place them in an outdoor greenhouse (winter October-December) for cultivation. Four pots are treated each time, and the whole test is repeated 3 times. When the test weeds grow to 2-3 leaves, the seedlings are transplanted, and 20 wild oats with the same growth are left in each pot. At the 3-4 leaf stage, the 3WP-2000 walking spray tower is used for stem and leaf spray treatment from low dose to high dose according to the test design, and a clear water control is set; after treatment with different concentrations of the agent, the wild oats are continued to be placed in the greenhouse for cultivation, and the growth status of the test weeds is regularly observed and recorded after treatment.

[0019] Investigation and statistical analysis methods: The fresh weight of the aboveground part was weighed 28 days after the application of the drug, and the fresh weight inhibition rate of each treatment was calculated. The calculation formula is as follows:

[0020] Fresh weight inhibition rate / % = [(fresh weight of control weeds - fresh weight of treated weeds) / fresh weight of control weeds] × 100

[0021] The Gowing method was used to judge the type of combined herbicidal effect: the theoretical control effect (E0) after mixed use was E0 = X + Y (100-X) / 100, where X and Y were the measured control effects of the two single agents (fresh weight inhibition rate %). The measured control effect after mixed use was represented by E. When E-E0 was between -10% and 10%, it was an additive effect, when E-E0>10%, it was a synergistic effect, and when E-E0<-10%, it was an antagonistic effect.

[0022] Table 1 Results of indoor toxicity test of caprylic acid and pinoxaden combined with wild oats

[0023]

[0024] Test results: As shown in Table 1, when the weight ratio of caprylic acid to pinoxaden is 15:1-5:1, it has a significant synergistic effect on wild oats, can effectively reduce the dosage of active ingredients, and delay the development of drug resistance.

[0025] Example 2 Field test of the efficacy of caprylic acid and pinoxaden in controlling annual grass weeds in wheat fields Site conditions:

[0026] The winter wheat experimental site is a wheat field with a large number of weeds occurring all year round. The cultivation and management conditions of the experimental site are consistent with those of farmers. The wheat variety planted is Sumai 188, and the planting method is machine seeding.

[0027] Annual grass weeds: wild oats, ryegrass, foxtail millet, Japanese foxtail millet

[0028] Test drug:

[0029] 30% caprylic acid·pinoxadone emulsifiable concentrate (comprising the following ingredients by weight percentage: 25% caprylic acid, 5% pinoxadone, 8% Nongru 500#, 4% Tween 80, 1.5% azone, and methyl oleate to make up 100%);

[0030] 22% caprylic acid·pinoxadone emulsifiable concentrate (comprising the following ingredients in percentage by weight: 20% caprylic acid, 2% pinoxadone, 7% Nongru 500#, 5% Tween 80, 1.5% azone, and methyl oleate to make up 100%);

[0031] 30% caprylic acid·pinoxaden dispersible oil suspension (comprising the following ingredients in percentage by weight: 25% caprylic acid, 5% pinoxaden, 54% Morwet D-42, 42% Terwet 100, 0.5% organosilicon defoamer, 0.3% organobentonite, and methyl oleate to make up 100%);

[0032] 22% caprylic acid·pinoxaden dispersible oil suspension (comprising the following ingredients in percentage by weight: 20% caprylic acid, 2% pinoxaden, 53% Morwet D-42, 44% Terwet 100, 0.5% organosilicon defoamer, 0.5% organobentonite, and 100% methyl oleate);

[0033] Test method: The field test was conducted in accordance with the Guidelines for Field Efficacy Tests of Pesticides (I) Part 41: Herbicides for Control of Weeds in Wheat Fields, GB / T 17980.41-2000, with a plot area of ​​25 m 2 , repeated three times, and arranged in random blocks. According to the experimental design, the concentration of the pesticide was prepared, and the stem and leaf spray was evenly sprayed using a backpack electric sprayer, and a clear water control treatment area was set up. The weather was sunny and breezy when the pesticide was applied, and the annual grass weeds in the field were in the 2-4 leaf stage. It was sunny and rainless for 5 days after the application, and the average temperature was above 5°C. There was no special bad weather during the experiment, and the field was managed routinely. Protective rows were set up around the experimental field, and conventional measures were taken in the wheat field except for the herbicide treatment factors.

[0034] Weed control efficacy survey method: The weed control efficacy was investigated on the fresh weight 30 days after the application of the drug. Three survey points were selected on the diagonal line of each treatment plot, with a height of 0.5 m 2 , calculate the total fresh weight of weed control effect, the formula is as follows:

[0035] Fresh weight inhibition rate / % = [(fresh weight of control weeds - fresh weight of treated weeds) / fresh weight of control weeds] × 100 Table 2 Field efficacy of caprylic acid and pinoxaden combined against annual grass weeds in wheat fields

[0036]

[0037] It can be seen from Table 2 that the mixture of caprylic acid and pinoxaden has excellent control effect on annual grass weeds in wheat fields; compared with emulsifiable concentrate preparations, dispersible oil suspension preparations can significantly increase the weed control effect, and field observations show that it is safe for wheat crops.

[0038] The above description is only a specific implementation mode of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principle of the present invention, and these improvements and changes are also regarded as the protection scope of the present invention.

Claims

1. A herbicide composition containing caprylic acid, characterized in that: The active ingredients consist of caprylic acid and pinoxaden, and the weight ratio of caprylic acid to pinoxaden is 15:1-5:

1.

2. The herbicide composition according to claim 1, characterized in that: The weight ratio of caprylic acid to pinoxaden is 10:1-5:

1.

3. The herbicide composition according to claim 1, characterized in that: The weight ratio of caprylic acid to pinoxaden is 5:

1.

4. The herbicidal composition according to any one of claims 1 to 3, characterized in that: The pesticide-accepted formulation is prepared, wherein the total weight of caprylic acid and pinoxaden in the formulation accounts for 5%-80% of the total formulation mass.

5. The herbicidal composition according to claim 4, characterized in that: The total weight of caprylic acid and pinoxaden in the preparation accounts for 10%-60% of the mass of the entire preparation.

6. The herbicidal composition according to claim 4, characterized in that: The formulation of the herbicidal composition is emulsifiable concentrate, suspension concentrate and dispersible oil suspension concentrate.

7. Use of the herbicidal composition according to any one of claims 1 to 6 for controlling weeds in crops.

8. The use according to claim 7, characterized in that: The crop is wheat.

9. The use according to claim 7, characterized in that: The weeds are grass weeds.

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