无瓣海桑主要害虫绿黄枯叶蛾的取食行为研究

绿黄枯叶蛾Trabala vishnou Lefebure是红树林植物无瓣海桑Sonneratia apetala Buch-Ham的重要害虫,为制定科学的防治指标和防治策略,对该虫的取食行为和取食量进行了初步的研究。结果表明:绿黄枯叶蛾幼虫喜食无瓣海桑、尾巨桉,拒食秋茄、桐花树;幼虫5龄,1～3龄幼虫具有聚集性,4龄幼虫开始分散取食;1～2龄幼虫取食量少,3～5龄取食量占整个幼虫期取食量的98.12%,其中5龄幼虫的取食量占整个幼虫期取食量的74.52%;幼虫期平均取食无辨海桑叶片178.94 cm2/头,确定防治指标为9.8头/千叶。

Feeding behavior of Trabala vishnou attacking Sonneratia apetala

Trabala vishnou Lefebure was an important pest on Sonneratia apetala Buch-Ham in mangrove.The feeding behavior and feeding amount of the pest were studied to provide a basis for the scientific control index and strategy.The results showed Trabala vishnou larvae preferred the leaves of Sonneratia apetala and Eucalyptus urophylla×E.grandis and didn’t feed on Kandelia candel and Aegiceras corniculatum.The larvae had 5 instars.The larvae in the 1st-3rd instars were aggregative and the larvae in the 4th instar began to disperse.The feeding amount of the 1st and 2nd instar larvae of was small and that of the larvae between the 3rd and 5th instars account for 98.12% of the total,of which the feeding amount of the 5th instar larvae was about 74.52% of the total.The average feeding amount was 178.94 cm2 per larva.The control index was 9.8 insects per thousand leaves.