Abstract:Aphrophora horizontalis,distributed on small areas south to Yangtze River in China,causes severe damage to small branches and young tops of many bamboo species in Phyllostachys.The insect has only one generation a year in Zhejiang and overwinters as eggs laid on small branches which had been damaged to death.Nymphs,feeding in cuckoo spit,can be found from mid-April to mid-June.There are five nymphal instars each taking respectively 13.75,10.71,6.19,5.78 and 12.74 days for development.Adults,occurring from early June to mid-November,suck sap from young tops after emergence and return to small branches on low parts of bamboos for mating and laying eggs in mid-September.Total death of nymphs is obtained three days after cavity injection of 50% methamidophos at the rate of 0.3ml per culm.