甘肃陇南大粒横沟象生物学特性研究

The Biological Characteristics Research of Dyscerus cribripennis in Longnan of Gansu Province

大粒横沟象为甘肃陇南油橄榄的主要蛀干害虫。采取室外观察结合室内饲养的方法,对该地区大粒横沟象生物学特性和危害状况进行了研究。结果表明:大粒横沟象在陇南地区1年发生2代,以老熟幼虫在树干内越冬,翌年2月化蛹,4月上旬羽化,4月中旬为成虫活动盛期,交尾产卵。5月下旬至7月下旬为幼虫危害盛期,7月下旬至8月上旬开始化蛹,经14~16 d蛹期后开始羽化,8月中旬为成虫第2次活动高峰期。大粒横沟象在本地区危害程度随不同油橄榄品种而异,随油橄榄发育期而异。

The Dyscerus cribripennis is the principal trunk borer of Olive europaea. We fed larvae and adults of Dyscerus cribripennis indoor and then observed the morphological characteristics and life history. The results showed that Dyscerus cribripennis had occured two generations in one year in Longnan area, and the overwinters mainly were mature larvae which was inside the trunk, then pupated in the following year of February,the stage of eclosion was on early April and had a peak time in mid-April, then began to mating. Larvae activated more frequently in late May to late July, pupation was in late July to early August, after fourteen to sixteen days`pupal stage they got adult eclosion stage, it would reach the second peak of active time in middle to late August.In these area, the damage degree of Olive europaea was depend on its varity. Pixueli was the most serious damaged one; larvae was more harmful than adults; the mature and the old period is more serious than sapling stage. The seeding was less harmful than other stages.