柿树新害虫──柿树真绵蚧的研究

柿树真绵蚧Eupulrinariacitricola（Kuwana）的报道在国内尚属首次。近年来该虫在河北省部分柿产区日趋严重，成为柿树的一种重要害虫。该虫在当地1年发生1次。以2龄若虫在当年生枝条上越冬，第二年3月上旬越冬虫体复苏，4月20～25日成虫交配，5月20～25日雌成虫产卵，6月10～20日若虫孵化后，固定在叶片上越夏，9月下旬越夏若虫蜕皮进入2龄，并转移到当年生枝条上越冬。农药防治结果表明：久效磷、氧乐果等有机内吸剂的防治效果很好，防治的最佳时间是6月中旬。该虫在当地的主要天敌有红点瓢虫ChilocoruskuwanaeSilvestri、黑缘红瓢虫C.rubidusHope和一种寄生蜂。

A study of a new pest of persimmon, Eupulrinaria citricola (Kuwana)

This is the first report on Eupulrinaria Citricola (Kuwana) reported in China. Recent years, this pest has grown more and more seriously in part of persimmon cultivated areas in Hebei province. The pest has one generation per year in local areas. The nymphs of two years old survived the winter on the branches newly-grown in that year and came back to life in the first ten days of the next March. Adult females completed their mating during 20th-25th in April and oviposited during 20th-25th in May. The nymphs hatched during 10th-20th in June,and lived through the summer on leaf blades. In the last ten days of September, overing summer nymphs exuviated and moved to the newly-grown branches for overwinter. The using of insecticides showed organic demeton, e. g, Monocrotphos and Omethonte ect, were of more effecient in controlling the insects and the best spraying bine was in the midddle ten days of June. The major maturel enemies of the insects in the local areas were Chilocorus kawanae Silvestri, Chilocorus rubidus Hope and a species of parasitic wasp.