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一、引言金华县过去系早中稻地区,螟虫为害甚輕。近年来水稻改制尚未彻底,造成早、中、晚稻混栽程度增加,提供了螟虫生長发育的有利条件。今年由于第四代三化螟提前井大量发生,金华連作晚稻白穗率普遍严重。根据在乾西乡五星、联合、上天寺、丰收等生产队調查的結果,連作晚稻白穗率皆在5％以上;其中五星的一块連作晚稻田,白穗率高达30％。据此推論,今年越冬虫口基数是很大的,势必將影响明年水稻生产。为
I. INTRODUCTION Jinhua County used to be an early-middle-rice area in the past. In recent years, rice reform is not yet complete, resulting in early, middle and late rice mixed planting increased, providing a favorable growth and development of borer conditions. This year as a result of the fourth generation of three borer in advance of a large number of boreholes, Jinhua continuous late rice white spike rate is generally serious. According to the results of a survey conducted by production teams such as Wuxing, Lianhe, Shangtian Temple and Bumper harvest in Qianxixiang, the rate of white spike even in late rice is over 5%. One of the five-star co-production is up to 30% in late paddy field. According to the corollary, this year the number of wintering insect population is very large, and will certainly affect next year’s rice production. for