敦煌市棉田烟粉虱的种群数量动态及防治

2006年4～9月系统调查敦煌市杨家桥乡棉田烟粉虱的种群动态及5种药剂防治效果.结果表明:敦煌市棉田5月下旬始见烟粉虱成虫,6月下旬开始普遍发生,8月上旬形成第一个成虫高峰,至9月中下旬随棉花采摘和气温的下降田间成虫数量逐渐减少.烟粉虱在不同的棉花品种上发生数量不同,敦棉V3上虫量显著低于另外4个品种.5种农药对烟粉虱的防治效果存在显著差异,其中阿克泰、蚧虱傲克药效最好,其3 d后的校正防效分别为88.86%、82.66%.

Population dynamics and its control of Bmisia tabaci(Gennadius) in cotton fields in Dunhuang

Based on a systemical survey from April to September,2006,the population of Bmisia tabaci(Gennadius) in cotton fields in Dunhuang,Gansu province was studied,and the efficacy of pesticide control was also investigated.The results indicate that the emergence of B.tabaci on cotton fields was in the last ten days of May in the area.And then it generally appeared in the last ten days of June.As temperature decreased and cotton was plucked,B.tabaci decreased gradually in the last twenty days of September.During this period,there was a peak of adults in the first ten days of August.Quantity of B.tabaci was different in different cotton varieties,quantity Dunmian V3 was lower than other 4 cotton varieties.The efficacy to B.tabaci was significantly different among 5 various pesticides.Thiamethoxam and Jieshiaoke have the best efficacy of all the pesticides,and after three days each of their correct control efficacy to B.tabaci was 88.68% and 82.66% respectively.