番茄田棉铃虫生物防治试验

试验结果表明，番茄田人造卵螟黄赤眼蜂释放方法以纸袋放蜂法最好，放蜂期间天气晴好也可采取蜂卡直接别放法。田间采卵调查，人造卵螟黄赤眼蜂对番茄田棉铃虫卵寄生率达５２ ．０ ％～７１ ．１ ％ ；喷施ＢＴ 制剂７ｄ 后校正虫口减退率达９５ ．０ ％ 。释放人造卵螟黄赤眼蜂结合喷施ＢＴ 制剂是防治番茄田棉铃虫的一项有效的无农药污染措施

Experiments of Biological Controlling Techniques of Helicoverpa armigera Hubner in Tomato Fields

Experiment results showed that the best method of releasing Trichogramma reared on artificial host eggs is to release Trichogramma card enveloped in paper bags in tomato fields. Direct release of trichogramma card in releasing period can be adopted if weather is clear. 52.0% to 71.1% cotton bollworm eggs was parasited after releasing Trichogramma chilonis in tomato fields. Cotton bollworm larvae corrected-mortality was 95.0% 7 days after spraying BT preparation. Combination release of T. chilonis with spray of BT preparation is an effective and pollution free measure in the controlling of cotton bollworm in tomato fields.