Susceptibility of Field Populations of Anopheles sinensis (Diptera: Culicidae) to Bacillus thuringiensis subsp. israelensis
Titel:
Susceptibility of Field Populations of Anopheles sinensis (Diptera: Culicidae) to Bacillus thuringiensis subsp. israelensis
Auteur:
Hongyu, Zhang Changju, Yang Jingye, Huang Lin, Lu
Verschenen in:
Biocontrol science and technology
Paginering:
Jaargang 14 (2004) nr. 3 pagina's 321-325
Jaar:
2004-05
Inhoud:
The susceptibility of Anopheles sinensis to Bacillus thuringiensis subsp. israelensis (Bti) was evaluated through exposure to varying concentrations of Bti. Mosquitoes were collected from five field populations of southern and central China (Zhongshan, Hengxian, Wuchang, Xinzhou, and Ruichang) and compared with a standard laboratory strain. The LC50 values were 146.4, 50.4, 57.9, 50.0, 41.6 and 24.6 ng/mL, respectively. Differences in susceptibility to Bti ranging from 1.7 to 5.9-fold compared with the laboratory strain. The Zhongshan strain had the greatest resistance. At low doses, Bti displayed residual effects. Peak mortality occurred from the first to the fourth day. Exposure to low doses increased the duration of larval development and decreased the duration of pupal development, indicating that low doses of Bti have a sublethal effect on their hosts.