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我县三化螟自一九七九年进入低潮,连续几年发生轻微,一般未行防治,晚稻白穗极少。但自一九八三年始局部地区三化螟回升迅速,四代发生较重;部分田块(晚稻)白穗高达20%以上。尤其八五年全县普遍回升。晚稻迟熟品种不论常规稻或杂交稻均出现较多白穗,部分边缘地区,如靠近肖江河一带的乡(镇)发生尤重,个别未治田块(晚稻)白穗率高达60%以上,造成一定损失。为探讨我县三化螟迅速回升原因,以便采取适当
Our county yellow rice borer since 1979 into a low tide, occurred for several years in a minor, generally not prevention and control, late rice white spike rarely. However, the rapid growth of the three stem borers in some areas started in 1983, with a serious occurrence in the fourth generation. Some fields (late rice) have white spikes up to 20% or more. In particular, the general recovery of the county in 1985. Late maturing varieties of late rice appeared more white spikes, both in conventional rice and hybrid rice. Some marginal areas, such as the townships near the Xiaojiang River, were particularly serious. The percentage of white spikes in individual untreated fields (late rice) was over 60% Cause a certain loss. In order to explore the reasons for the rapid rebound of rice borer in our county in order to take appropriate