松梢隐翅虫对松梢挥发物的选择

Selective preferences of Placusa pinearum to volatiles of pine shoot

为研究松梢挥发物与松梢隐翅虫之间的化学信息联系,本文利用"Y"型嗅觉仪测定了松梢隐翅虫雌、雄成虫对松树健康梢、微红梢斑螟幼虫虫害梢以及虫粪的选择行为。结果表明:马尾松、火炬松、黑松虫害梢对松梢隐翅虫雌、雄成虫的引诱作用都显著高于对照,其中马尾松虫害梢对雌、雄成虫的引诱作用最强。对健康梢、一、二年生马尾松虫害梢以及虫粪的选择结果表明,雌成虫选择顺序为:微红梢斑螟幼虫虫粪>二年生虫害梢>一年生虫害梢;雄成虫选择顺序:二年生虫害梢>微红梢斑螟幼虫虫粪>一年生虫害梢。总体上,松梢隐翅虫雌、雄成虫都明显选择虫害梢,对健康梢有一定的驱避性。本文可作为进一步研究松梢隐翅虫成虫林间扩散行为、探索其作为载体昆虫携带病原物开展微红梢斑螟生物防治的参考。

In order to study the chemical information interactions between the volatiles of pine shoot and Placusa pinearum,the selective preferences of P. pinearum to volatiles of healthy pine shoot,pine shoot infected by Dioryctria rubella and larval frass of D. rubella were determined with Y-tube olfactometer in this paper. The results showed that the male and the female adults preferred the pine shoots infected by D. rubella larvae to the control check significantly in Pinus massoniana,P. taeda and P. thunbergii,especially in that of P. massoniana. Comparing among the healthy pine shoot,the infected pine shoot and the larval frass,the rank order of female adults preferences was larval frass biennial infected pine shoot annual infected pine shoot. As to male adults,the rank order was the biennial infected pine shoot larval frass annual infected pine shoot. On the whole,P. pinearum adults preferred the infected pine shoot above all others. Meanwhile,they showed a repellent response on the healthy pine shoot to some extent. This experiment may provide a reference to study the dispersal behavior of P. pinearum adults in pine forest,and explore the biological control of D. rubella by use of P. pinearum to deliver pathogens.