A kind of insecticide composition containing bromofenac

Abstract

The invention relates to the technical field of pesticides, and discloses an insecticide composition, wherein the active ingredients are bromofenac and fenthion, and the weight ratio of the two is 1:50 to 50:1. The two groups of active ingredients of the invention have obvious synergistic effect after compounding, can reduce the dosage of medicine, expand the insecticide spectrum, increase the lethality rate of pests, prolong the duration of insecticide, delay resistance, and are safe for crops and the environment.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticides and relates to an insecticidal composition containing brofenac and fenthion, which is used for preventing and controlling crop pests. Background Art

[0002] Broflanilide is an insecticide with a novel mechanism of action jointly developed by Mitsui Agrochemicals, Ltd. and BASF. It is mainly used for fruits and vegetables, beans, cotton, corn, grains, flowers and non-crop purposes to control pests such as Lepidoptera, Coleoptera, termites, ants, cockroaches, flies, etc.

[0003] Fenthion is an organophosphorus insecticide with contact and stomach poisoning effects and a long residual period. It inhibits acetylcholinesterase, causing pests to die of poisoning. It is mainly used to control lepidopteran larvae, aphids, leafhoppers, planthoppers, thrips, fruit flies, leaf miners and some scale insects on crops such as soybeans, cotton, fruit trees, vegetables and rice. It can also be used to control mosquitoes, flies, bedbugs, lice and cockroaches.

[0004] There is no related report on the combined use of brofenac and fenthion in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide an insecticide composition with obvious synergistic effect, capable of delaying resistance and reducing usage amount.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is:

[0007] A pesticidal composition comprising brofenac and fenthion, wherein the active ingredients comprise brofenac and fenthion, and the mass ratio of brofenac to fenthion is 1:50 to 50:1. Preferably, the mass ratio of brofenac to fenthion is 1:50 to 1:10. Preferably, the mass ratio of brofenac to fenthion is 1:50.

[0008] The weight percentage of the active ingredient in the insecticide composition is 5 to 80%, preferably 10 to 50%.

[0009] The insecticide composition is used for preventing and controlling crop pests, including Lepidoptera, Coleoptera and chewing mouthparts pests; in particular, it is used for preventing and controlling rice stem borer.

[0010] The advantages of the present invention are that the combination of the two exhibits a significant synergistic effect within a certain range, can reduce the dosage and cost, can delay resistance, is highly safe, and is environmentally friendly. DETAILED DESCRIPTION

[0011] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention is illustrated by the following specific embodiments, but the present invention is by no means limited thereto. Percentages in the embodiments are all weight percentages.

[0012] Application Example 1: Indoor Toxicity Determination Test of the Compound of Broflanilide and Fenthion

[0013] The test took the striped stem borer of rice as the test object and adopted the rice seedling dipping method. The specific method is as follows:

[0014] Pour about 2 mL of 1.5% agar aqueous solution onto the soil surface of a small plastic cup with rice seedlings about 25 cm high until it is flush with the cup mouth, and let it stand for 20 min to solidify. Invert the rice seedlings and immerse them in the prepared liquid medicine for 10 s at the base of the rice seedlings, take them out and dry them until there is no visible free water, cut the rice stems at the root, remove the upper leaves, and leave a stem of 5.5 cm - 6.0 cm; put them into a prepared medium-sized petri dish (lined with four layers of filter paper at the bottom of each dish and added with 3 mL of sterile water for moisturizing), with 15 stems in each dish; repeat the above operations in the order of the test design doses from low to high, with 4 replicates for each concentration. Use a writing brush to transfer the test insects into the petri dish, with 10 insects in each dish, cover it with two layers of black cotton cloth and then cover the petri dish lid, and place the treated test insects in a light incubator at a temperature of (28 ± 1°C), light (light-dark ratio 16 h:8 h), and humidity (60% - 70%) for feeding and observation. Check the number of dead and live insects in each treatment after 48 h of treatment.

[0015] Use DPS statistical analysis software for statistical analysis, calculate the LC 50 and LC 90 , compare the synergistic effect, and calculate the co-toxicity coefficient (CTC) of the compound agent mixture according to the Sun Yunpei method. The calculation formula of the co-toxicity coefficient (CTC) is as follows:

[0016] Actual toxicity index (ATI) = (LC 50 of the standard agent / LC 50 of the tested agent) × 100

[0017] Theoretical toxicity index (TTI) = toxicity index of agent A × percentage content of agent A in the mixture + toxicity index of agent B × percentage content of agent B in the mixture

[0018] Co-toxicity coefficient (CTC) = (ATI / TTI) × 100

[0019] According to the classification standard of the co-toxicity coefficient (CTC), CTC ≤ 80 is antagonistic effect, 80 < CTC < 120 is additive effect, and CTC ≥ 120 is synergistic effect.

[0020] Toxicity assay results:

[0021] Table 1 Results of indoor combined toxicity test of brofenac and fenthion against rice stem borer

[0022]

[0023] It can be seen from Table 1 that when the mass ratio of bromofenac to fenthion is in the range of 1:50 to 1:10, the CTC is greater than 120, and there are different degrees of synergistic effects. In particular, when the mass ratio is 1:50, the synergistic effect is significant.

[0024] In summary, the insecticidal composition of brofenac and fenthion described in the present invention has a significant synergistic effect on rice stem borer, expands the insecticidal spectrum, can delay resistance, is safe for crops, can reduce the amount of medicine used, and is safe for the environment.

Claims

1. An insecticidal composition containing bromofenac for controlling rice stem borer, characterized in that: The active ingredients include brofenac and fenthion, and the mass ratio of brofenac and fenthion is 1:10 to 1:

50.

2. The use of the insecticidal composition according to claim 1, characterized in that: The mass ratio of bromofenac and fenthion is 1:

50.

3. The use of the insecticidal composition according to any one of claims 1 or 2, characterized in that: The weight percentage of the active ingredient is 5 to 80%.

4. The use of the insecticidal composition according to claim 3, characterized in that: The weight percentage of the active ingredient is 10 to 50%.

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