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一、生活习性梨大食心虫俗称“吊死鬼”,以危害梨芽和果实为主,在莱阳县一年二代,以幼虫在芽内作薄茧越冬,翌年3月下～4月上旬,气温升到7℃时开始转芽为害,4月中旬气温达10℃以上时为转芽盛期。幼虫以为害花芽为主,一头幼虫可危害2～3个芽。幼虫转芽时,自芽基蛀入为害,花期在花丛轴上吐丝缠绕。5月上旬幼虫开始为害幼果,转果期长达30天。一头幼虫可连续为害1～3个果。5月下～6月上旬,老熟幼虫在最后一个被害果内化蛹。蛹期7～10天。6月下旬,羽化成虫在萼洼、芽旁及枝条粗皮缝隙中产卵,卵期6～7天。幼虫孵化后,危害当年生芽,7月中旬大量转果,一虫仅害一果,并在其中化蛹。成虫于8月上旬大量羽化。越冬代幼虫在8月中、下旬出现,每虫可害2～3个芽,在为害的最末芽内作茧越冬。
First, the habits of Pear Gourmet worms commonly known as “hanging haunted ghost” to harm the pear buds and fruit-based, in Laiyang County a year second generation, with larvae in the bud for thin cocoon over the winter, the following year ~ April early April, the temperature When it rose to 7 ℃, it began to turn buds damage, when the temperature reached 10 ℃ in mid-April, it was the turning-point. The larvae that harm the flower buds, a larvae can endanger 2 to 3 buds. Larvae turn buds, since the bud-based decay into damage, flowering axis in the bush winding silk. In early May larvae began to harm young fruit, turn fruit period up to 30 days. A larva can damage 1 to 3 fruit in a row. From May to early June, mature larvae pupate within the last victimization fruit. Pupa 7 to 10 days. In late June, eclosion adults lay oviposit in the calyx depression, buds and shoots, and the egg period is 6-7 days. Larvae hatch, endangering the year buds, mid-July a large number of fruit transfer, a pest only harm a fruit, and in which pupa. Adults in early August a large number of emergence. Overwintering on behalf of the larvae in mid-August, late appear, each insect damage of 2 to 3 buds, in the damage of the last buds make winter cocoon.