Monema flavescens Walker is a serious pest of garden trees in Guiyang. There was both one generation and two generations in its life history each year, in which about 3/4 of the total individuals occurred one generation each year. The adults from both onegeneration and twogeneration emerged in the last 20 days of May. The diapause stage, including prepupa and pupa in conoon, lasted for 8～10 months. Parasitic natural enemy of M. flavescens showed higher controlling effect, as the average parasitic rate of overwintering pupae was 34%. The melanous rate of adults was 2.75%. Three shapes of egg were found in insect cage(40 cm×30 cm×50 cm). During the study period (2004～2007), the host plants of M. flavescens were different in different year. Based on the occurrence and natural control, some control strategy and suggestions were mentioned.

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