Abstract:An assay was made on the bioactivity of the extracts of tangerine peel from Cinocitrus tangerina,orangepeel from Citrus sinensis and mixed tangerine peel from Cinocitrus sp.against aphis Semiaphis heraclei,Aphis craccivo-ra,Uroleucon gobonis and Myzus persicae using residual film or topical method,and against mites Tetranychus viennensis and T.trancatus using slide-dip or immersion method.Test results show that these extracts have strong bioactivityagainst aphids and mites.The corrected mortality regression equations and LC50(or LD50),of these extracts to pests arepresented.