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发生为害特点(一) 越冬虫态复杂经过连续三年对越冬虫薯、薯蒂的解剖证明,除卵不能存活外,其余三种虫态均可越冬。因越冬虫态不同,致使翌年出现两个明显的成虫活动高峰,分别出现在4月上旬下(以成虫越冬)和5月上旬初(以幼虫和蛹越冬),前后相隔20余天。(二) 发生期长扦插后第7天开始产卵至11月底,整个危害期长达150余天,世代重叠,连续为害。(三) 繁殖系数大实验证明,年繁殖世代为3.4代,年增长率为8.9倍(其中从1代到2代增长4.42倍)。(四) 为害有转移性据调查
Occurrence of pests characteristics (A) overwintering insect complex After three consecutive years of overwintering insect, potato pedicle anatomy proved that in addition to eggs can not survive, the other three species can be winter. Due to the different overwintering pests, two obvious peak activities occurred in the following year, which occurred in early April (overwintering adult) and early May (overwintering with larvae and pupae), respectively, more than 20 days apart. (B) the long period of occurrence of cuttings began to spawn the first 7 days to the end of November, the entire duration of damage up to 150 days, generations overlap, continuous damage. (C) large coefficient of propagation Experiments show that the annual breeding generation is 3.4 generations, the annual growth rate of 8.9 times (of which 1 to 2 generations increased by 4.42 times). (D) harm the transfer According to the investigation