CN106417349A - A kind of insecticidal composition containing bifenthrin and picroderm - Google Patents

Abstract

The invention relates to an insecticidal composition containing bifenthrin and celastrus angulatus, wherein the effective components of the insecticidal composition comprise bifenthrin and celastrus angulatus, and the weight ratio of the bifenthrin to the celastrus angulatus is 5-25: 1-2. The invention has synergistic effect, is suitable for preventing and controlling tea lesser leafhoppers, can delay the development of pest resistance, reduces the application amount of each single agent and improves the prevention and control effect.

Description

A kind of insecticidal composition containing bifenthrin and picroderm

technical field

The invention relates to the technical field of pesticide application, in particular to an insecticidal composition containing bifenthrin and picroderm.

Background technique

The green leafhopper is a major pest that occurs commonly in tea areas in my country, is more harmful, and is a key control pest. Among them, the green leafhopper with false eyes is the most serious hazard. At present, bifenthrin is mainly used in the market to prevent and control tea leafhoppers, but due to long-term single and frequent medication, the resistance of tea leafhoppers increases, and the control effect is not ideal.

Phyllostachys chinensis is a perennial vine of the family Euonymus, which is widely distributed in the hills and mountainous areas of the Yellow River and Yangtze River basins in my country. Both the root bark and the stem bark of Phyllostachys chinensis contain a variety of powerful insecticidal components. Dozens of new compounds have been isolated and identified from the root bark or seeds, especially 4 crystals obtained from the seed oil, namely Phalaenopsis chondroe Esters I-IV, 5 pure natural products obtained from the root bark, ie, picroderm I-V. The insecticidal active ingredients of these bitter bark vines are all referred to as celastrus angulatus. At present, there have been relevant reports on the use of paterogenin in tea leafhoppers, such as "Comparative Experiments on the Effects of Several Botanical Insecticides on Tea Leafhoppers" published by Wen Zhaoming and Wei Jingfeng, which confirmed the effect of paterogenin on tea leafhoppers. The control of the small green leafhopper has a good effect.

Combining pesticides with different mechanisms of action is a quick and simple way to delay the resistance of pests and diseases. Bifenthrin and pharethrin have different mechanisms of action. At present, there is no relevant report on the application of the insecticidal composition mixed with bifenthrin and parethrin to the control of tea leafhoppers.

Contents of the invention

The technical problem to be solved by the present invention is to provide an insecticidal composition containing bifenthrin and picrodine to solve the problem of increased resistance and reduced efficacy of bifenthrin due to single and frequent use.

The present invention adopts the following technical scheme: a kind of insecticidal composition of bifenthrin and phasicrin, the active ingredient is composed of bifenthrin and piculin, and the weight ratio of bifenthrin and piculin is: 5-25:1-2, preferably, the weight ratio of bifenthrin and picrodine is 25:2.

In the insecticidal composition, the percentage by weight of bifenthrin is 2.5-10%, and the percentage by weight of pectin is 0.2-1.0%.

The insecticidal composition is made into agriculturally acceptable dosage forms such as emulsifiable concentrate, water emulsion, suspension concentrate and the like by adding corresponding adjuvants according to methods known to those skilled in the art.

The adjuvants of the insecticidal composition of the present invention include solvents, emulsifiers, wetting agents, stabilizers, antifreeze agents, defoamers, thickeners or other known agents that are beneficial to the stability of the active ingredients in the formulation and the performance of the drug. Substances are various ingredients that are commonly used or allowed to be used in the field of pesticide preparations, and are not particularly limited. The specific ingredients and dosage are determined through experiments according to the formulation requirements.

Compared with the prior art, the present invention has the following technical effects:

(1) The combination of bifenthrin and pharethrin in a certain proportion has a synergistic effect, which can reduce the application amount of each single agent and improve the control effect.

(2) The mechanism of action of bifenthrin and pharethrin is different, and the mixed use of each other can delay the development of pest resistance, which is beneficial to prolong the service life of bifenthrin.

(3) Compared with the single use of bifenthrin, it can reduce the amount and frequency of use of bifenthrin single agent, reduce the application of chemical pesticides, and is more environmentally friendly.

detailed description

The technical scheme and technical effect of the present invention will be further described below in conjunction with the indoor combined toxicity assay test and the field efficacy test of measuring insecticide activity, and the percentages described in the present invention are all percentages by weight.

Through a large number of screening tests, the inventor found that the mixture of bifenthrin and pharethrin within a certain ratio range has an obvious synergistic effect on tea leafhoppers, and the effect is not just a simple addition of the two agents , specifically illustrated with the following biological assay examples.

1. Examples of bioassays

Example 1: Indoor Toxicity Determination of Bifenthrin, Phyllanthrin and Their Mixtures to Tea Tree False-eyed Leafhopper

Test object: tea leafhopper (Empoasca flavescens) was collected from Nanjing County, Zhangzhou City, Fujian Province, cultivated on tea trees, and the same 3rd instar nymphs were picked for the test.

Test drug: 97% bifenthrin technical material (Jiangsu Huifeng Agrochemical Co., Ltd.), 6% picroderm parent drug (Dongfeng Chemical Factory, Xinxiang City, Henan Province).

Test method: refer to (Zhuang Jiaxiang et al., 2009, Regional Differences of Insecticide Resistance of Leafhopper in Fujian Province) and Indoor Bioassay Test Guidelines for Pesticides Insecticides NY/T 1154.11-2008), using tip dipping method.

Sun Yunpei’s co-toxicity coefficient method (CTC) was used to evaluate the synergistic effect of drug mixture. When the co-toxicity coefficient (CTC) ≥ 120, the composition exhibited a synergistic effect; when the CTC ≤ 80, the composition exhibited an antagonistic effect ; When 80<CTC<120, the composition exhibits an additive effect.

The test results are shown in Table 1.

Table 1 The combined toxicity test of bifenthrin, picroderm and their mixtures on tea leafhoppers

Test drug Proportion _LC50 (mg/L) Co-toxicity coefficient (CTC) Bifenthrin (A) / 2.32 / Paretin (B) / 0.71 / A:B 5:1 1.22 137.2 A:B 10:1 1.38 138.9 A:B 15:1 1.41 143.7 A:B 20:1 1.36 154.4 A:B 25:1 1.34 159.3 A:B 5:2 1.04 134.8 A:B 15:2 1.29 141.3 A:B 25:2 1.19 166.9 A:B 1:5 1.08 73.9

The results of the joint toxicity test in table 1 show that the co-toxicity coefficient (CTC) of the joint toxicity determination of the green leafhopper of tea when bifenthrin and picrodermin weight ratio is mixed between 5-25:1-2 All greater than 120, with obvious synergistic effect. When the ratio is 25:2, the co-toxicity coefficient is the largest and the synergy is the most obvious.

Two, preparation embodiment

Example 1: 2.7% bifenthrin · phasicine suspension concentrate (bifenthrin: phasicine = 25:2)

Take by weighing 2.5% of bifenthrin, 0.2% of picrodine, 3.5% of alkylphenol formaldehyde resin polyoxyethylene ether (dispersant), 3.5% of alkylphenol polyoxyethylene ether phosphate (wetting agent) ), polyvinyl alcohol 2.5% (thickener), silicone (defoamer) 0.3%, and deionized water to make up to 100%.

Example 2: 5.5% Bifenthrin·Picterillin Suspension Concentrate (Bifenthrin:Pictorialin=10:1)

Take by weighing 5.0% of bifenthrin, 0.5% of picrodine, 2.5% of alkylaryl polyoxypropylene polyoxyethylene ether (dispersant), 5.0% of sodium polynaphthaldehyde sulfonate (wetting agent), Ethylene glycol 2.5% (antifreeze), xanthan gum 0.8%, organic silicon (defoamer) 0.3%, deionized water to make up to 100%.

The preparation method of Example 1-2 is as follows: mix each component uniformly according to the ratio of the formula, grind and high-speed shear to obtain an insecticidal composition containing bifenthrin·picrodine, and the dosage form is a suspension concentrate.

Example 3: 11% bifenthrin·picillin emulsifiable concentrate (bifenthrin:picralin=10:1)

Take by weighing 10.0% of bifenthrin, 1.0% of picrodine, 3% of sodium dodecylbenzenesulfonate (dispersant), 2.0% of octylphenol polyoxyethylene ether (emulsifier), dimethyl ethylene Sulfone 5% (solvent), turpentine oil to make up to 100%.

The preparation method of Example 3 is: add bifenthrin and picrodine original drug, emulsifier and co-solvent, etc., according to the formula ratio, into the mixing tank in sequence, and stir evenly to obtain 11% bifenthrin·piculata Rattan cream.

Example 4: 3.0% bifenthrin · phasicine in water emulsion (bifenthrin: phasicine = 5:1)

Weigh 2.5% of bifenthrin, 0.5% of picrodine, 3.5% of biphenol polyoxyethylene ether, 10% of xylene, 5.0% of calcium dodecylbenzenesulfonate, 0.8% of organic silicon, and make up with water to 100%.

The preparation method of Example 4 is: dissolving the original drug of bifenthrin and picroderm, solvent and emulsifier, and then mixing with water, and through the high-speed stirring of the reaction kettle and the high-speed shearing of the shearing machine, the preparation Obtained 3.0% bifenthrin · picrodine aqueous emulsion.

3. Examples of medicinal effects in the field

Example 1: Field efficacy test of bifenthrin and pharethrin compounded against tea leafhoppers

Design of the test: The test adopts the conventional spray method, and strives to be even and thoughtful when spraying. When the pesticide is applied, the field tea green leafhopper is the peak period of 1-2 generations. Before spraying, samples were taken at 5 points on the diagonal in each plot, and 3 tea trees with eggs and adults of Leafhopper were selected at each point, and the population base of the number of leafhoppers before spraying was counted. 3d, 7d, and 15d after the application, the number of live insects of the residual tea leafhopper was investigated respectively, and the number of live insects was recorded to calculate the control effect.

During the test period, the weather was fine, and the average daily temperature was 18.0-26.8°C. During the test, it was observed that the tea leaves in each treatment plot grew well, and no phytotoxicity was found.

The test results are shown in Table 2

It can be seen from Table 2 that after compounding bifenthrin and parethrin, the control effect, quick effect and long-lasting effect of the compounded agent on the tea leafhopper are significantly better than that of the single agent. This is of great significance for reducing the frequency of application, significantly delaying the emergence of drug resistance in tea leafhoppers and reducing control costs.

Claims (3)

1. a kind of Pesticidal combination containing Biphenthrin and Celastrus angulatus is it is characterised in that the weight of Biphenthrin and Celastrus angulatus Amount ratio is 5-25:1-2.

2. Pesticidal combination according to claim 1 is it is characterised in that the weight ratio of Biphenthrin and Celastrus angulatus is 25:2.

3. the Pesticidal combination according to right wants 1 or 2 is it is characterised in that the percentage by weight of Biphenthrin is 2.5- 10%, the percentage by weight of Celastrus angulatus is 0.2-1.0%.