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稻虱和叶蝉(Laodelphax striatellusFallen, Segatella fureifera Horrath, Nila-prvata lugans Stalet Nephotettix cincticps(Uhler) etc) 是水稻的重要害虫,尤其在7、8、9月常暴发成灾,造成严重减产.为了摸清该类害虫卵期天敌的效果及其作用规律,以便在“综合治理”稻虱、叶蝉中发挥它的应有作用,笔者从1979年秋天开始对安徽省稻虱、叶蝉的自然天敌控制效果进行了系统调查研究.现将近四年来有关卵天敌的作用规律及其效果预测方面初步研究结果简介如下. 一、卵天敌作用规律共考查121块次,寄主卵3408块33049
Laodelphax striatellus Fallen (Segatella fureifera Horrath, Nila-prvata lugans Stalet Nephotettix cincticps (Uhler) etc) is an important pest of rice, especially in July, August and September, To clarify the effects of natural enemies in the egg stage and its law of action in order to play its due role in the “comprehensive management” of rice louse and leafhopper. From the autumn of 1979, Natural enemies of the control effect of a systematic investigation.Now the past four years on the role of egg enemies and their effects in the prediction of the preliminary results are summarized as follows.One, the law of egg natural enemies of a total of 121 checks, the host egg 3408 33049