论文部分内容阅读
1979-1984年对非洲蝼蛄进行了生物学习性研究.在河南每年发生面积1500-2000万亩.危害作物与杂草9科30种,其中对小麦的苗期危害率平均达4.1%,最高达46.1%.以成、若虫在20-82厘米深的地下穴洞内越冬;春、秋活动深度为20及22.2厘米;夏季最浅为15.2厘米.雌虫4-10月间产卵,产卵前期61-235天.单雌可产卵1-6次,8-182粒,平均2.2次63粒.卵期12-59天平均22.4天.若虫分7-8龄,少数6或9龄个别10龄,历期130-335天.完成一个世代需经历387-418天.
From 1979 to 1984, we carried out a biological study of the African catfishes, with an annual area of 15-20 million mu in Henan, 30 families of 9 families and 9 weeds, of which the average rate of damage to wheat at seedling stage was 4.1% 46.1% .In nocturnal, nymphs wintering in 20-82 cm deep underground cave; the depth of spring and autumn activities is 20 and 22.2 cm; the shallowest in summer is 15.2 cm .Female spawns and spawns in April-October The first 61-235 days.Single female can spawn 1-6 times, 8-182 grains, an average of 2.2 times 63. Egg 12-59 days averaged 22.4 days.Nymphs 7-8 years old, a small number of 6 or 9 individuals 10-year-old, with a duration of 130-335 days. It takes 387-418 days to complete one generation.