The lethal effect of extreme hightemperature on Sitobion avenae
Author of the article:YANG RenFengLI KeBinYIN JiaoDU GuangQingCAO YaZhong
Author's Workplace:State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing100193, China
Key Words:Sitobion avenae, high temperature, mortality rate, halflethal temperature, halflethal time
Abstract:Detailed experiments were conducted to explore the effects of brief exposure to extreme hightemperature(45℃,30、40、50、60、70、80、90 s;50℃,5、10、15、20、25、30、35、40 s;55℃,5、10、15、20 s;60℃,5、10、15 s;65℃,5、10 s;70℃,5 s)on wheat aphids Sitobion avenae (Fabricius) and to measure mortality rates of adults and nymphs. Mortality rates were found to increase with increasing temperature and duration of exposure. The time to complete death of all test animals was 90 s at 45℃, but just 5 s at 70℃. The halflethal temperature decreased with increased treatment time and the halflethal time decreased with increasing temperature. A logistic model indicates that, under the same conditions, the halflethal temperature and the halflethal time of adults are higher than those of nymphs.