【摘要】 在扬州地区,稻象虫一年发生1代,以老熟幼虫越冬,其越冬存活率免耕田>少耕田>常规耕田.蛹发育的高低温临界点为38.16℃和9.84℃,最适发育温度26.52℃,有效积温117.8日度.每头雌虫产卵3-29粒,平均18.8粒;成虫羽化后17-31天为产卵盛期;产卵孔平均高度为4.1±1.5cm,水面下卵孔占28.6%;产卵孔与取食孔特征不同.卵期7±1.8天.成、幼虫的种群空间格局基本属聚集分布(仅(?)≤3时的成虫种群为随机分布).单季稻的为害重于双季稻;沙质土壤的发生量多于粘壤土;稻-麦(油菜)两熟制田的为害显著重于稻-稻-麦(油菜)三熟制田.更多还原

【Abstract】 Echinonemus squameus occurred one generation a year and overwintered with the mature larva in Yangzhou of Jiangsu Province.The survival rate of the larva after overwintering was maximum in notillage,middle in little-tillage and minimum in tillage.Crit- ical high and low temperature,optimal temperature and effective cumulative temperature for the development of pupa were 38.16℃,9.84℃,26.52℃ and 117.8℃ day degree respectively. The number of eggs laid by a female were from 3 to 29,and 18.8 on an average.The female laid most eggs 17～31 days after emergence.Average height of hole-laying was 4.1±1.5cm, and the hole below water in paddy field was 28.6%.Egg duration was 7±1.8 days.Spatial patterns of larva and adult fitted to aggregated distribution.Incidence of damage in monoculture was more serious than that in double-cropping of rice.The population of the pest in sandy loam was greater than that in clay loam.Injury of double crop system (rice-wheat or rape)was more serious than that of triple crop system(rice-rice-wheat or rape).更多还原