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稻螟是水稻的大敌,它在水稻收获后一般躲在根茬内越冬。掌握稻螟越冬規律,对于冬季治螟具有重要的意义。据1961—1962年在桐城地区的观察研究,三种螟虫越冬比例因地区类型不同而有所差异。一般三化螟在圩畈区越冬数量多、密度大,二化螟以丘陵区和山区为主要越冬地区,大螟越冬情况与二化螟相似,但数量极少。通过初步分析,三化螟幼虫由于体内油脂腊質校少,因而构结保护膜越冬。随着气温的变化,結膜率在12月份以前平均将近50%,翌年1—2月份則上升到100%,待春暖花开时,从膜内化蛹,开始新的一年生活。二化螟先在稻桩内越冬,然后因气温变化則迁移到其他禾茬和杂草内,而以高粱茬中密度最大。
Rice stem borer is the enemy of rice, it is generally harvested in rice after winter stubble. Grasp the rules of overwintering rice borer, for the winter governance borer is of great significance. According to the observation and study in Tongcheng area from 1961 to 1962, the proportion of overwintering of the three stem borers varies according to the type of the area. In general, Borer borer overwintered in the polder area with a large amount of density and the stem borer and mountainous area were the main wintering areas. The overwintering situation of Sesamia inferens was similar to that of the stem borer, but the quantity was extremely small. Through preliminary analysis, the stem borer larvae due to the body oil waxy school less, thus forming the protective film overwintering. As the temperature changes, the conjunctival rate averaged nearly 50% before December and from January to February the following year to 100%. When the spring flowers bloom, pupation begins within the membrane and the new year begins. Chilo suppressalis first winters in the pile, and then due to temperature changes are migrated to other stubble and weeds, while the highest density in sorghum stubble.