栗绛蚧的研究

Studies on Kormes nawai Kuwana

栗绛蚧(Kormes nawai Kuwana)是板栗主要的枝梢害虫之一,广泛分布在浙江省各板栗产区。栗绛蚧在浙江省诸暨市1年发生1代,以2龄若虫越冬,越冬后的2龄若虫和雌成虫危害最甚。成虫出现在3月中旬至5月下旬,行两性生殖,雌成虫平均产卵量为2623粒。新若虫在5月中旬孵化,5月末达盛期。用2.5％溴氰菊酯乳油3000倍液、20％杀灭菊酯乳油3000倍液和40％氧化乐果乳油500倍液,喷杀1龄若虫,可收到较好的防治效果。黑缘红瓢虫、寄生蜂和芽枝状枝孢霉菌是显著控制虫口密度的重要天敌。

Kormes nawai Kuwana is one of the major pests damaging Costanea mollissima, widely distributed in the producing area of Chinese chestnut in Zhejiang province. In Zhuji city, the pest produces one generation each year and overwiters in the 2nd instar larval. The most harmful generations are the post-winter 2nd instar larval and the female adult pest. Adult pests emerge from mid-March to the end of May and has a sexual reproduction. Averagely a female pest produces 2 623 ova. The young larval hatches in mid-May and becomes abundant at the end of May. Good control effect can be achieved by use of 8.3 ppm decamethrin, 66.7 ppm sumicidin or 800 ppm omethoate sprayed on the new larval. Chilocorus rubidus and Cladosporium cladosporioides are important natural enemies which can control the population desity of the pest to a considerable extent.