Method of releasing mixed Trichogramma species to control corn borer and cotton bollworm

Abstract

The invention relates to a method for releasing mixed trichogramma species to prevent and control european corn borers and cotton bollworms. The method comprises the steps that 1, at a mixed long-acting bee card manufacturing stage, protective bee cards are manufactured, the protective bee cards are manufactured with brown paper with one hair side and a shiny side, and each protective bee card comprises 10 to 100 single bee card bodies; gelechiid moth eggs are adopted as hosts to breed trichogramma chilonis and trichogramma ostriniae; bee cards are prepared in two batches; evenly mixed parasitic bees are evenly scattered on the cards when the bee cards are prepared; 2, at a bee releasing stage, as for the bee releasing time, the first batch of bees are released at the summer corn ear stage, european corn borer emergence starts to emergence at the summer corn ear stage, and the second batch of bee are released 5 days after the first batch of bee cards are released; as for the bee releasing method, 150 single bee cards are hung in the summer corn field per hectare, the bee releasing sites are 4 m to 5 m away from the field edge, and the distance between the bee releasing sites rangesfrom 7 m to 9 m. According to the method, the bee releasing frequency can be reduced, the survival time of the trichogramma in the field is effectively prolonged, and the effect of preventing and controlling the european corn borers and the cotton bollworms is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of biological control of agricultural pests, and relates to a method for releasing mixed Trichogramma species to control corn borer and cotton bollworm. Background technique [0002] Corn borer and cotton bollworm are important grain and cotton pests in my country, causing serious damage to corn and cotton in the Huanghuaihai region of my country all the year round. In recent years, with the transfer of the main cotton production area in my country, the harm of cotton bollworm in corn fields has become increasingly serious. In the Huanghuaihai summer corn planting area, corn borer and cotton bollworm have become the most important pests of summer corn earing stage. In the process of pest control for many years, my country has developed a variety of technical methods for the control of corn borer and cotton bollworm. Among them, releasing its parasitic natural enemy Trichogramma during the egg-laying period o...

AI Technical Summary

Problems solved by technology

Since Trichogramma is obligate to parasitize the eggs of target pests, releasing a single bee species has limited control effect on another non-target pest. In addition, the peak period of cotton bollworm in the Huanghuaihai region lags behind that of corn borer all the year round. Therefore, conventional methods control both Two types of Trichogramma need to be released separately for each pest, resulting in an increase in the number of releases in the field and the labor required for bee release, which increases the cost of pest control

The unemerged bees on the bee card are easily eaten by predatory natural enemies such as ladybugs and lacewings, which reduces the number of bees and affects the effect of preventing pests

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