火炬树和黄栌新害虫——双线棘丛螟生物学特性观察

Morphology and life-history characteristics of a new insect pest of the staghorn sumac and the smoketree: the pyralid moth Termioptycha bilineata(Lepidoptera, Pyralidae)

本文记述了北京火炬树上的一种重要害虫——双线棘丛螟Termioptycha bilineata各虫态的形态特征和生物学特性。在北京,1年2代,以蛹在土中越冬,翌年5月底成虫开始羽化。幼虫为害期在6月底至7月下旬和8月下旬至9月中旬。除为害火炬树外,它还能为害黄栌。记录了2种捕食性天敌:侧条宽颚步甲Parena latecincta和细黄胡蜂Vespula flaviceps。最后提出了为害严重时的防治建议,即在6月初使用20%除虫脲悬浮剂5 000倍液均匀喷雾。

This paper describes the morphology and life-history characteristics of adults, eggs, larvae and pupae of the pyralid moth Termioptycha bilineata, an important pest on the staghorn sumac （Rhus typhina Linn.） in Beijing, illustrated with color pictures （including those of the male genitalia）. This species has 2 generations per year and overwinters as pupae in cocoons in soil. The beginning of eclosion is at the end May. The peak damage periods are from the end of June to last 10-days of July, and from the last ten days of August to the middle ten days of September. The pyralid moth also damages the smoketree （Cotinus coggygria Scop. var. cinerea Eng.） in a limited area. Its natural enemies include 2 predators; a ground beetle, Parena latecincta and the blackjacket wasp, Vespulaflaviceps. A suggested chemical control of heavy infestations is spraying a 5 000×water solution of 20% diflubenzuron （SC） at the beginning of June.