›› 1987, Vol. 23 ›› Issue (zj2): 96-100.
• 研究简报 • 上一篇 下一篇
杨立铭 陈土生 杜秀文
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Yang Liming,Chen Tusheng,Du Xiuwen
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Abstract: Larch casebearer(C.Dahurica)is a serious pest of larches(Larix spp)in nor rheastern China.The number of needles infested and fed by a casebearer larva in.Different instars were determined.The pest has four-instars in larvae stage and overwinters as a 3rd-instr larva (a few as a 2nd-instar).The average number of needles infested were 4—7,by a larva at the instar of 1-3 in summer and fall and 39.7 by a last-instar larva in spring,with a max.Of 48.5.The length and weight of ne-dles fed by the insect in 24 hours were measured on sixteen full-grown larvae.On the average,3.88 needles were infested by a full-grown larva,the fed length was 24.13mm,41.18%of total infested needles,and the fed weight was 6.65mg,3.22 times heavier than the larva’s weight and 55.74%of the total weight of the infested needles.It was found that the fourth-instar larvae and the pupae of larch casebearer were attacked by its parasites and no larvae in their 1-3 instar were Parasitized.To protect parasites.The chemicals to eontrol the pest should be applied in summer or fall.
杨立铭 陈土生 杜秀文. 兴安落叶松鞘蛾幼虫的生物学特性及其有关问题的讨论[J]. , 1987, 23(zj2): 96-100.
Yang Liming;Chen Tusheng;Du Xiuwen. A STUDY ON BIOLOGICAL CHARACTERS OF COLEOPHORA DAHURICA FLKV.LARVAE[J]. , 1987, 23(zj2): 96-100.
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