Biological characteristics and fumigation technology for Heterobostrychus hamatipennis Lesne

Heterobostrychus hamatipennis Lesne causes more and more serious damage on the wicker in warehouse in Anhui province in recent years.In order to control it efficiently,we studied its biological characteristics and fumigation technology.The results of feeding in the laboratory and survey in the warehouse were as follows.It has 2 generations a year in Anhui province and overwinter as matured larvae in the injured wickers.The overwintering larvae begin to harm in late March and pupate in late April.A large number of the adults emerge in the middle of May.The adults start to spawn in late May.The larvae of the first generation hatch in early June.The larvae start to pupate in early August.In the middle of August,the first generation adults emerge.About ten days later,the adults start to spawn.In early September,the second generation larvae hatch.And until November,when the new wickers are harvested,the matured larvae would move into the new wickers and overwinter.The fumigation tests were carried out with aluminium phosphide 56% tablet and dichlorvos 80% emulsion in hermetic bags,and the results showed that the mortality in different stages could achieve 100% at 72 h after fumigation with aluminum phosphide 56% tablet at the dose of 12 g.m-3,and the larvae are more sensitive to phosphine than any other stages.Therefore,fumigation control must focus on the stage of recovery of overwintering generation larvae,which is in late March and early April every year,with aluminium phosphide 56% tablet at 12 g.m-3above 72 h.