Walker E D
Department of Entomology, Michigan State University, East Lansing 48824, USA.
J Am Mosq Control Assoc. 1995 Mar;11(1):107-10.
Experiments were conducted to determine the effects of low temperature (0 and 4 degrees C), vs. a high temperature (22 degrees C), on the feeding rate of Aedes stimulans larvae, and their susceptibility to Bacillus thuringiensis var. israelensis (H-14) (B.t.i.). Third-instar Ae. stimulans slowed but did not halt feeding at 0 and 4 degrees C compared to 22 degrees C. Susceptibility of larvae, as measured by LC50 values, to B.t.i. was highest at 22 degrees C (LC50 = 0.1 ppm), and lower at 4 degrees C (LC50 = 0.2 ppm) and 0 degree C (LC50 = 0.9 ppm). The data from the feeding and susceptibility experiments suggest that decreased efficacy of B.t.i. at low temperatures may occur because the rate of larval feeding decreases. Low water temperature should be a consideration during operational applications of B.t.i. for control of larvae in cold-water habitats, such as the spring Aedes species.
进行了实验以确定低温（0和4摄氏度）与高温（22摄氏度）对刺激伊蚊幼虫摄食率及其对苏云金芽孢杆菌以色列变种（H - 14）（B.t.i.）敏感性的影响。与22摄氏度相比，三龄刺激伊蚊在0和4摄氏度时摄食速度减慢但并未停止。以LC50值衡量，幼虫对B.t.i.的敏感性在22摄氏度时最高（LC50 = 0.1 ppm），在4摄氏度时较低（LC50 = 0.2 ppm），在0摄氏度时更低（LC50 = 0.9 ppm）。摄食和敏感性实验的数据表明，低温下B.t.i.效力降低可能是因为幼虫摄食率下降。在将B.t.i.用于控制冷水生境（如春季伊蚊种类）中的幼虫进行实际应用时，应考虑水温较低这一因素。
