Method for prevention and control of vegetable root-knot nematodiasis with mixed Sr18 biological nematocide

Abstract

The invention discloses a method for prevention and control of vegetable root-knot nematodiasis with mixed Sr18 biological nematocide. The method includes: preparing the mixed Sr18 biological nematocide from 8-time concentrated aqueous solution of Sr18 and avermectin emulsion according to a weight part ratio of 7.5:2; subjecting soil to rotary tillage before use of the mixed Sr18 biological nematocide, dividing plots according to areas of test plots, ridging, taking corresponding Sr18 agent and avermectin emulsion according to the preparation ratio at the step (1), uniformly mixing, adding clean water for diluting by 10-20 times, adopting spraying equipment for soil spraying, transplanting in 3-5 days after application of the mixed Sr18 biological nematocide, and additionally applying the nematocide for 1-2 times to long-season vegetables in the middle period of planting by irrigating the nematocide along with water and keeping the dosage and proportion unchanged; detecting conditions of vegetable root-knot nematodiasis. Experiment results show that root-knot nematodiasis can be effectively controlled by the method, consumption and utilization frequency of avermectins are greatly reduced, the picking period of cucumbers is greatly prolonged by about 3 months, and fruit setting rate of tomatoes is increased by 30%.

Description

[0001] This invention was funded by the National Natural Science Foundation of China (Project No. 31272019). technical field [0002] The invention relates to a mixing method of biopesticides, in particular to a method of mixing Sr18 bionematicides to prevent and control vegetable root-knot nematode diseases. The advantages of a long period of time, through the synergistic effect between the two, make up for the shortcomings of a single preparation, overcome the resistance of nematodes, improve the control effect of pesticides, prolong the harvesting period of crops, increase production and income significantly, and expand the use of pesticides scope. Background technique [0003] Plant nematodes are a kind of important plant pathogens distributed worldwide. They have a wide range of parasites and strong environmental adaptability. Almost every crop is attacked by plant nematodes. Among them, root-knot nematodes and cyst nematodes are the most harmful to crops. . Root-knot...

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Problems solved by technology

[0006] Articles published on plos one by Huang Wenkun of the research group in 2014: Wen-Kun Huang, Jian-Hua Sun, Jiang-Kuan Cui, Gang-Feng Wang, Ling-An Kong, Huan Peng, Shu-Long Chen, De-Liang Peng . Efficacy Evaluation of Fungus Syncephalastrum racemosum and ematicide Avermectin against the Root-Knot Nematode Meloidogyne incognita on Cucumber [J]. Plos One, 2014,9(2):1-6.) The medicament fermentation scale in the article is small, and the formula is PS, Without adding malt extract, most of the substances formed under PS medium conditions are acidic substances, which are not conducive to the production of insecticidal substances that work under neutral conditions, and the pH of the fermentation filtrate is adjusted to 7.0 with 1.0mol / L NaOH, which will reduce Drug effect, increase soil salt pollution

At the same time, the control effect of Sr18 on nematodes is not fully reflected, which is related to the inappropriate proportion of pesticides used. Since the test site is a greenhouse with severe root-knot nematodes and the density of nematodes in the soil is high, if the dose of Sr18 is insufficient, the nematodes cannot be controlled within the effective range. In the soil, it will cause nematodes to reproduce again and increase the damage to the plants; moreover, the application time is not reasonable, and the application of the pesticide 2 days before transplanting does not reach the best time for the action of the pesticide, so it cannot be used The effect of the drug is fully exerted

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