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稻纵卷叶螟上升为稻区主要害虫后,广大贫下中农和科技人员加强了这方面的调查研究,初步明确了发生为害规律,掌握了防治方法。但是越冬虫态和场所,以及发生代的虫源问题,尚不清楚,有待继续调查。现综合各地调查情况,试谈个人认识,与同志们共同商讨。 (一)越冬虫态和场所: 1.查到了部分越冬场所。据调查,华南一带一般以幼虫或蛹,在沟渠或低湿地杂草上过冬;华东一带,以蛹或老熟幼虫在稻草叶鞘,特别是无效分蘖上,以及李氏禾、双穗雀稗、马唐等杂草上越冬。一九六八年和一九七○年冬后温州地区农科所均在稻草叶鞘內查到活
After the rice leaf roller climbed to the main pests in the rice area, the majority of poor and middle-income peasants and scientific and technical personnel stepped up investigations and studies in this area, initially identified the occurrence of damage rules and mastered the prevention and treatment methods. However, the status and place of overwintering insects, as well as the generation of insect sources, are not yet clear and are yet to be investigated. Based on a comprehensive survey of various places, we can talk about personal understanding and hold discussions with our comrades. (A) overwintering state and place: 1. found some overwintering places. According to the survey, larvae or pupae are generally distributed in the south of China in the ditches or low wet weeds over winter; in the east of China, pupae or mature larvae are used on the leaf sheaths of straw, especially the ineffective tillers, Crabgrass and other weeds overwinter. In 1968 and the winter of 1970 after the Agricultural Science Institute in Wenzhou were found in the straw sheath