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象山县地处浙中沿海,稻纵卷叶螟一年发生五代,常年以第二代和第四代分别在连作早稻和晚稻上发生为害较重。1993年稻纵卷叶螟第二、三代大至特大发生,第四代偏重发生,为八十年代以来发生为害最为严重的一年。一、大发生概况 1、蛾峰明显,蛾量大。根据观测区田间系统赶蛾情况分析,第二、三、四代稻纵卷叶螟均有明显的蛾峰,且高峰蛾量均显著高于往年。第二代(部分迁入型)有两个明显高峰,7月
Xiangshan County is located in the coastal areas of Zhejiang, rice leafroller occurs five generations a year, perennial to the second and fourth generations of continuous cropping in the early rice and late rice damage occurred more seriously. In 1993, the second and third generations of rice leaf roller occurred especially large and the fourth generation took the heavier stress, which was the most serious one since the 1980s. First, a large occurrence profile 1, moth obvious, large amount of moths. According to the field survey of moths in the observation area, the second, third and fourth generations of rice leafroller had obvious moths, and the peak moths were significantly higher than in previous years. The second generation (partial migration) has two distinct peaks in July