粤北桑芽瘿蚊的世代及生活史和习性调查

Studies on the Generation, Life Cycle and Life Habit of Giadomyia sp. in North Guangdong

调查表明 :粤北桑芽瘿蚊 1年发生 10代 ,世代重叠现象明显 ,从 5月初一直为害至 11月 ,11月底以结成囊包休眠体的老熟幼虫在桑田土表层中进行越冬 ,但从 6月下旬开始各代均有部分老熟幼虫结成囊包休眠体在桑田土表层中进行越夏、越冬 ;全年以第 1～ 3代发生量最大。各虫态历期 :卵 1～ 2d ,幼虫 5～ 12d ,蛹 5～ 12d ,成虫 1～3d ,完成 1个世代需 15～ 2 6d ,大多要 2 0d左右。雌雄成虫比例 (性比 )约为 2 5 1∶1。

Mulberry gall midge ( Giadomyia sp.) in north Guangdong had 10 generations in 1996 and the generations were overlapped. It damaged the mulberry buds from May to November every year. In late November, mature larvae in capsules hibernated in the upper soil of the plantation. However, some of mature larvae began over summering or hibernation from late June. The maximum quantity of occurrence was in the first, second and third generations. The developmental duration for eggs was 1～2 days, larvae 5～12 days, pupae 5～12 days and adults 1～3 days respectively, which means that it took 15～26 days to complete one generation and mostly about 20 days. The ratio of female to male was 2 51∶1.