榛实象甲生物学特性及发生特点研究

Study on Biological and Ecological Characteristics of Curculio dieckmanni

榛实象甲是危害平榛的主要害虫,在辽宁省铁岭市2年发生1代,少数为3年1代。常以老熟幼虫及成虫在寄主植物附近的土壤中越冬。5月上旬越冬成虫出土,6月中下旬雌成虫产卵于幼果内,7月上中旬为产卵盛期,7月中下旬为孵化盛期,幼虫在果内取食近1个月后发育成老熟幼虫。老熟幼虫8月下旬~9月上旬入土越冬。入土的幼虫下一年7月下旬化蛹,7月下旬至8月下旬新成虫羽化,8月中旬为成虫羽化盛期。新羽化的成虫直接入土越冬。阳坡榛林比阴坡受害重,山下比山上受害重,纯林比混交林受害重,林龄越高受害越严重。

Curculio dieckmanni is the major pest of Corylus helerophylla. The result showed that Curculio dieckmanni occurrs one generation in two years, several three years in Tieling area, Liaoning Province. They overwinter as mature larvae and adults in the soil nearby the host plants. The emergenced adults break out of the earth in early May. The female adults lay eggs in the tender hazelnuts in middle and late June, and the peak of oviposition is in early and middle July. The eggs hatch with a peak in middle and late July. The larvae food on hazelnuts about one month, then become mature larvae. The mature larvae overwinter into the soil in late August and early September. The overwintered larvae pupate in late July the second year. The pupas emergence in late July and late August with a peak in middle August. The new adults overwinter directly in the soil. Curculio dieckmanni damage hazelnuts more seriously on the sunny slopes than on the shady slops,and more seriously on the upper part of slope than on the lower part of slope. the elder of the Hazel shrubbery is, the more seriously be damaged. Curculio dieckmanni damages more seriously in pure hazel shrubbery than in the mixed forest.