虫害诱导杨树对杨扇舟蛾寄主选择和生长发育的影响

Effects of phytophagous insect induced popular resistance on the behavior and growing development of Clostera anachoreta

在室内采用选择性和生物测定方法,研究了昆虫取食危害过的杨树对杨扇舟蛾寄主选择行为和生长发育的影响。结果表明:杨扇舟蛾幼虫对虫害处理的叶片表现为忌避行为;取食虫害处理的叶片,使得幼虫的发育历期延长,死亡率增加,对食物的利用和转化效率下降;蛹质量减小;成虫的羽化率降低,产卵量减少。因此,昆虫取食危害能够诱导杨树对杨扇舟蛾产生抗虫性。

Choice experiment and bioassay were conducted in the laboratory to identifiey the mechanism of induced resistance of Populus deltoides after Clostera anachoreta feeding. Its effect on the host preference and growing development of the insect herbivore was studied. The result showed that larvae prefer to healthy leaves under choice situation. After feeding on treated leaves, the larvae development time prolonged, mortality rate increased greatly, the relative growth rate （RGR） reduced significantly, the efficiency of conversion of digested food （ECD）, the efficiency of ingested food （ECI） and relative consumption rate （RCR） decreased although no significant difference between treated leaves and healthy leaves. Furthermore, the development of pupae and adults were also affected negatively after C.anachoreta feeding on treated leaves, and pupae weight declined, emergency rate and number of egg laying decreased. This study indicates that insect herbivore can elicit P.deltoides induced resistance which inhibits nutrient metabolism and retards the behavior and development of C.anachoreta.