| Population dynamics and its control of Bmisia tabaci（Gennadius） in cotton fields in Dunhuang |
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| DOI：10.7606/j.issn.1000-7601.2007.06.21 |
| Key Words: cotton Bmisia tabaci(Gennadius) population dynamic variety quantity control |
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| Abstract: |
| 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. |
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