【摘要】 根据1984～1990年在广州、东莞、中山的调查,为害荔枝的天牛为龟背天牛 Aristo-bia testudo(voet)。龟背天牛一年发生一代。成虫于7月大量羽化,在7、8月间咬食枝梢皮层以补充营养,造成枯梢。8月卵盛见。幼虫于9月盛孵,直至12月仍在皮下取食,其体长仅0.4～0.7cm。越冬后,幼虫依荔枝品种的熟期迟早而先后恢复活动,大量取食并迅速钻入木质部发展坑道。老熟幼虫体长5～6cm,坑道50～70cm。6月后陆续化蛹。主栽的荔枝品种以黑叶、妃子笑受害较重,糯米糍受害较轻,在品种较单一的条件下,桂味、淮枝受害也不轻。幼树较老树受害重。7月至12月是防治龟背天牛的关键时期。药剂防治试验效果不理想。在目前的科技水平条件下,经几年的实践表明,掌握成虫盛见期、卵期及低龄幼虫期进行人工捕杀的方法防治龟背天牛,效果、效率相当理想,有推广应用价值。更多还原

【Abstract】 According to our survey in GuangZhou.DongGuan and Zhong Shan,the longhorn beetle injuring the Lithchi was Aristobia testudo(voet).It had one genera-tion each year.The adult emerged generally on July.They bite around the barkof the twig circular like then made them withered.Eggs were laid individuallyunder the bark most in August.The larvae hatched in September mainly and fedjust under the bark before hibernation(from August to December).The larvaewas about 0.4—0.7 cm.in length in these period.After hibernation the lar-vae continue activity according to the mature of the litchi variety.They bor-ed into the wood and developed the tunnel rapidly.The final larvae’s tunnel bu-rrow was about 60 cm long.Among the main varieties of litchi,Hei Ye,Fei Zi Xiao were infested mostheavily.Chemical control we had used was failed,except injecting % DDVP 100X tothe tunnel.The effective control measures for this pest were:catching the adult in Julyand August,killing the egg and larvae with a smalle knife when they were underthe bark before activity from hibernation.There were 5 months from August toJanuary left for us to control.We had practised that a skillfull labour killing112 larvae only use 2 hours.更多还原