关键词: 三峡库区, 三峡库区, 肉牛生产, 问题, 对策

Abstract: Bioactivity experiments were conducted with Plutella xylostella using Zanthoxylum bungeanume extracts of different polarity solvents. The result showed that, the extract of chloroform had a powerful contact toxicity on the eggs and the larvae in 3rdinstar, the egg hatching percentage was 9.94% after treated with 5days, the larvae corrected mortality was 67.86% at 72h; The extract of petroleum ether had higher stomach toxicity on the larvae in 3rdinstar, the corrected mortality was 35.71% at 72h; The extracts of four solvents did not have significant effect for pupa weight, pupation rate and emergence rate of Plutella xylostella. The conclusion was important for making further research of insecticide plant Zanthoxylum bungeanume.