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水稻二化螟,以一代危害最重最广。而且由于一代防治的好差,即残留虫量的多寡,又直接影响二、三代的发生轻重。因此,正确预测一代无疑是争取全年主动防治的关键。然而,自发现部分越冬幼虫,有重新迁入新寄主的规律后,为摸清越冬后的虫口和发育时间,不仅为此要花费大量的精力,而且情况复杂难以查清。具体表现以下三方面:一,调查对象多。年前晚稻收割后,幼虫主要在稻桩和稻草内,而稻桩内的大约一半虫量
Chilo suppressalis, the most harm to the generation of the most widely. And because of the poor control of a generation, that is, the amount of residual insects, but also directly affect the occurrence of two or three generations of severity. Therefore, correctly predicting the generation is undoubtedly the key to fighting for a proactive approach throughout the year. However, since some of the overwintering larvae were found, there was a tendency of re-entering the new host. To find out the population and developmental period after overwintering, it not only took a lot of energy, but also the situation was complex and difficult to find out. Specific performance of the following three aspects: First, the number of respondents. After the late rice harvest years ago, the larvae were mainly in the rice piles and straw, while about half the amount of insects in the rice piles