武威地区谷子坐茬初步研究(二) 传毒媒介灰飞虱(Laodelphax striatellus)生活史观察

灰飞虱是武威地区夏、秋田常见的一种害虫,是谷子坐茬的传播媒介。该虫在当地一年发生三至四代,以三代为主。成虫寿命最长43天,最短3天,平均25天。成虫有长翅型、短翅型两种。短翅型绝大多数是雌虫。成虫产卵量最高492粒,最低21粒,平均150粒左右。卵期最长11天,最短6天,平均8天左右。卵孵化的时间,几乎全部是在上午9时至12时之间。若虫有五龄虫和六龄虫两种,其比例为1:1.28—1.4。六龄虫若虫期比五龄虫稍长。若虫期最短18天。最长29天。平均19天左右。

The preliminary Study on Rosette Disease of Millet (Ⅱ)

Planthopper (Laodelphax striatellus) does damage to summer and autumn crops in wuwei area of Gansu province.It also transmits rosette disease of millet. Planthopper usually has 3-4 generations each year, with 3 enerations in the main cases.The age of adult is within 3-43 days, the average being 25 day.There are two types of adults, viz.long wing type and short wing type.Short wing type for the most part is female. The egg-laying number of adult varies from 21 to 492 granules, the average being about 150 granules. The egg stage experiences 6—11 days with the average of 8 days. Most of eggs hatch at 9 to 12 o'clock a.m. Its nymphs belong to either 5 age classes or 6 age classes, their proportion is 1 to 1.2-1.4.The nymph stage of 6age classes is slightly longer than that of 5 age classes.The nymph stage is 18-29 days, with its average of 19 days.