Research On Killing Lymantria Dispar With γ-irradiation

Lymantria dispar is a main forest pest in our country, which caused serious damage to our forest resources, making the ecological environment, the exports of foreign trade and the development of economic society subjected to severe effect. At the same time, Lymantria dispar is not only one of the important international quarantine pests but also the most dangerous forest pest in the world.This paper, with the research method based on the international quarantine, systematically studies the artificial feeding of Lymantria dispar—a representative of forest pests, and the death and sterility roles of different dose and dose rate ofγ-ray on Lymantria dispar's eggs, larvae and adults. The concrete results are as follows:Lymantria dispar is raised with the self-made artificial feedstuff. And we can further defines the growth progress, growth course, age of the Lymantria dispar and other biological indicators and ecology characteristics. This research shows that Lymantria dispar experiences four stages in its life: egg, larva, pupa and adult. The sex ratio is 1:1. In July and August of each year, the female will spawn (one adult female produces an egg mass including about 750 eggs). In the following April or May, these eggs begin hatch within about 2-3 weeks to complete. In July pupa evolves into the adult, then spawn to reproduce the next generation. It is isolated from generation to generation. One generation one year.Carry out the radiation of different dose and dose rate treatment on the Lymantria dispar's eggs, larvae, pupas and adults in groups. Then keep and observe physiological indicators to identify the radiation treatment effect. According to the trial results, insecticidal effect is related to the radiation dose and the radiation dose rate. Based on the test results, a conclusion can be made: the suitable radiation lethal dose of adult is 0.5 to 0.3 KGy. The suitable radiation lethal dose of larvae is 0.4 to 0.3 KGy; The suitable effective dose of egg is 0.3 KGy and the radiation dose rate is 0.3 KGy / min～0.45 KGy / min would be more appropriate. The dose and dose rate can be as a commercial application of reference dose.In this paper, the life, fecundity, and other indicators show that the artificial feedstuff is successful. According to the trial results,γ-ray has a remarkable killing role on Lymantria dispar's eggs, larvae and adults. The possibility of preventing Lymantria dispar with irradiation is feasible.