南阳市直纹稻苞虫虫源性质研究

Research on Feature of Rice Skipper Source in Nanyang City

通过2年对南阳市直纹稻苞虫初见雌成虫卵巢发育情况解剖分析和对当地发生情况系统调查,结果表明:南阳每年始见雌成虫卵巢发育均在4级以上,且均已交配,末代幼虫在杂草上不能发育到蛹即死亡;越冬期多处调查未发现任何虫态;当地上、下2代幼虫发生数量悬殊;该虫成虫和稻纵卷叶成虫有明显的同步发生现象。认为南阳市直纹稻苞虫每年初始始虫源来自南方。

Two years ＇research were carried out on dissecting the initial female adults of rice skipper to analyze the growth of germanium and to investigate their occurrence systematically. The results indicated that all the local initial female adults had been mated and the growth of their germanirm were above 4th degree. The last generatiin larva in weeds died before they changed into nymph. Any states of rice skipper could not be found in hibematiln stage in many places. The former and the later generation larva＇s population was remarkably different in Nanyang City. Rice skipper adults often occurred at the same as rice leaf roller. Based on the research ,it could be concluded that the initial rice skipper in Nanyang City of Henan Province migrated from south of China.