Abstract: 【Objective】To evaluate the predation preference of Amblyseius andersoni（A. andersoni）,a new recorded species,to different prey.【Methods】The predation preference of female adults of A. andersoni to different states of Bemisia tabaci（B. tabaci）and Tetranychus truncatus（T. truncatus）was analyzed by means of predation quantity and predation preference test combined with Cain evaluation index.【Results】In the predation quantity test,for B. tabaci,the highest average daily predation and total predation of A. andersoni was observed in 1^st instar nymph,which were 7.19±0.59 and 113.29±7.95,respectively;for T. truncatus,the highest average daily predation and total predation of A. andersoni was observed in larvae,which were 12.00±2.18 and 186.71±7.18,respectively. In the predation preference test,the predation quantity of A. andersoni against 1^st instar nymph of B. tabaci was 7.90±1.22,the predation quantity of A. andersoni against egg of B. tabaci was 2.50±0.59,and the Cain index（D）was 3.16>1;the predation quantity of A. andersoni against larvae of T. truncatus was 17.35±1.80,and the predation quantity of A. andersoni against egg of T. truncatus was 15.60±2.99,and the Cain index（D）was 1.11>1;the predation quantity of A. andersoni against 1^st instar nymph of B. tabaci was lower in comparison with larvae of T. truncatus,and the Cain index（D）was 0.51<1.【Conclusion】Compared with B. tabaci, A. andersoni showed higher predation preference to T. truncatus,especially for larvae of T. truncatus.

Key words: Amblyseius andersoni, Bemisia tabaci, Tetranychus truncatus, Predation quantity, Predation preference