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稻纵卷叶螟在我国各地危害轻重因不同地区和年份而有异,除与气候条件和栽培制度有密切关系外,亦与其天敌,特别是卵与幼虫的寄生天敌数量有一定关系。目前采用的综合防治措施中,用赤眼蜂以消灭其卵已获得肯定的效果。但各地使用的赤眼蜂种类并不完全一致,因此所获得的效果也颇不一致。查明本地稻纵卷叶螟卵自然寄生天敌的种类,以确定不同蜂种对防治效果的影响等,颇有必要。本文报导所采用的方法,是在不同类型的水稻田中于稻纵卷叶螟卵期随机取样采集卵粒,然后分别置于小指形管中,每管一卵,逐日除去孵化卵粒,留下寄生卵,观察记载寄生天敌的羽化等情况。
In addition to the close relationship between climatic conditions and cultivation system, the damage severity of C. medinalis in different regions and years has a certain relationship with the number of its natural enemies, especially the eggs and larvae. Among the comprehensive prevention and control measures currently used, the use of Trichogramma to destroy its eggs has yielded positive results. However, Trichogramma species used in various places are not exactly the same, so the results obtained are quite different. It is necessary to find the natural parasitic natural enemies of native rice leaf roller cone borer species in order to determine the impact of different bee species on the control effect. The method used in this paper is to randomly sample and collect the eggs in different types of paddy fields in the rice leaf roll stage and then place them into the small finger tubes one egg per tube to remove the hatching eggs daily and leave behind Parasitic eggs, observe the emergence of parasitic natural enemies and so on.