水稻二化螟发生规律及防治的初步研究

A Primary Study on Outbreak Regularity and Control Methods of Striped Rice Borer

摘要:

水稻二化螟Chilo suppressalis(walker)近年来在吉林省暴发性大发生。该虫在吉林省一年发生1代,以幼虫在稻草茎、稻茬内越冬。越冬幼虫6月中、下旬化蛹,7月上旬为羽化盛期,产卵高峰期为7月中旬;7月中、下旬为幼虫为害盛期,为害期长达2个月。田间小区药剂筛选试验表明:20%三唑磷乳油1 500 mL/hm²防效显著。在施肥量相同的情况下,施肥时期对二化螟的发生为害更为重要。

Abstract:

Striped Rice Borer[Chilo Suppressalis (walker)] outbroke heavily in recent years.It outbreaks one generation for one year in Jilin Province,with its larva crossing winter in rice straw and rice stubble.The larva which larva which crosses the winter pupates in late June as well as eclosion stage in early July.The high peak of laying eggs is in mid-July, and serious stage of larva’s jeoPardization is in mid-late July,which jeopardizates rice for two monthes.The selecton experiment of chemicals in field plots shows that the significent control effect is the amount required 1500 mL/hm² of 20% Hostathion Emulsifiable Concentrate (EC).Under the case of same amount fertilizer required, the fertilizing stage is important to ontbreak-jeopardization of striped Rice Borer.