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梧桐木虱又称梧桐裂头木虱,在南京一年主要发生一代,部分二代。一代为主害代,5月中旬至6月上旬危害最重。一代发生期为4月中旬末至7月上、中旬,成虫产于叶背上的卵当年能孵化为二代,产于枝干上的卵则滞育越冬。第二代发生于6月至11月上旬,成虫产卵于枝干上越冬。越冬卵孵化与青桐顶芽萌发具有明显的物候联系。若虫有群集性,通常潜居在自身分泌的大量白色蜡质物中。成虫产卵前期平均为6±1.2天,卵期平均为15.6±2.1天。一、二代各龄若虫平均历期,一龄分别为13.8±1.8和11.2±0.8天,二龄分别为5.8±0.9和5.0±1.2天,三龄分别为8.4±1.2和6.5±0.7天。成虫繁殖力强,最高产卵量可达1701粒。一代发生期主要捕食性天敌有大草岭和两种寄生于若虫的寄生蜂。药剂试验表明,梧桐木虱对药剂反应敏感,室外使用40％乐果、40％氧化乐果和50％甲胺磷各2000倍喷雾,防效达98—100％。4月下旬越冬卵盛孵期用内吸剂氧化乐果涂树干一次,即能控制一代危害。
Sycamore psyllium, also known as Indus split lice, a major occurrence in Nanjing a year, part of the second generation. Generation-based victimization, from mid-May to early June most harmful. Generation occurs from mid-April to last July, mid-adult eggs produced in the back of the leaf can hatch into the second generation, the eggs produced in the branches of diapause overwintering. The second generation occurred in June to early November, adult spawning on the branches of the winter. Overwintering egg hatching and top buds of Qingtong have obvious phenology. Nymphs have a cluster, usually living in their own secretion of a large number of white waxy material. The average pre-oviposition of adults was 6 ± 1.2 days, and the average egg-laying period was 15.6 ± 2.1 days. The first and second instar nymphs averaged 13.8 ± 1.8 and 11.2 ± 0.8 days for first instars, 5.8 ± 0.9 and 5.0 ± 1.2 days for second instar and 8.4 ± 1.2 and 6.5 ± 0.7 days for third instar, respectively. Adult fertility strong, the maximum amount of eggs up to 1701. The main predatory natural enemies during the first generation were the herbaceous parasites and two parasitic wasps that were parasitic on the nymphs. Pharmacy tests showed that P. psylla was sensitive to pesticides and was sprayed with 2000 times of 40% dimethoate, 40% omethoate and 50% methamidophos outdoor respectively, with the control effect of 98-100%. In late April, the overwintering eggs Sheng Sheng with endosulfan coated omethoate trunk once, that is able to control the generation of hazards.