青桐木虱的研究

<正>青桐木虱是青桐的重要害虫,以成、若虫刺吸为害,若虫还能分泌大量蜡絮而影响树木的光合作用和呼吸作用;5～6月蜡絮纷纷飘落,严重污染周围环境;若虫分泌蜡絮,蜜露导致煤污病发生,从而使青桐遭受双重为害。该虫在合肥一年发生3代,以卵在枝、干上越冬,第一代为重。药剂试验结果表明:以2.5％敌百虫粉剂、苏达粉、80％滴滴畏乳油、40％乐果乳油较为理想。

A STUDY OF THYSANOGYNA LIMBATA ENDERLEIN (HOMOPTERA: PSYLLIDAE)

Thysanogyna limbata is an important pest of the phoenix tree, an excellent shade one. Its adults and nymphs infest the trees by sucking. The nymphs affect the photosynthesis and respiration of the trees and pollute environments seriof usly in May and June by secreting waxy filaments, which induce sooty mould, thus causing double infestation. A systematic study of the psyllid was made from 1982 to 1985. In Hefei, this psyllid has 3 generations in a year and its eggs overwinter on twigs and trunks. The first generation causes the most serious damage. Some research has been made on its biological characters, rela tionships between its occurence and environments, and control methods. According to the tests of insecticides and various powders, 80% emulsion of DDVP and 40% emulsion of dimethoate showed much promise.