9-year research showed that black cicada had obvious occurrence in pomelo orchard.The correlation between the nympha had been significantly out of soil molting and raining rate of progress. It was obvious that the harm of black cicada reached peak in la. The nympha emergency must have attachment, and black cicada nympha between 61.82% and 89.45% emerged in the evening. We applied the allied control techniques by ＂resources type＂, picked the nympha by ＂wreath form sink＂ and control techniques by Beauveria bassiana （Metarhizium） black cicad...
