Abstract: Functional responses of Pediobius foveolatus to Henosepilachna vigintioctopunctata were studied in this paper.The results showed that the functional responses of P.foveolatus to host larval density of H.vigintioctopunctata could be described very well by Holling disc equation Ⅱ at all test temperatures.The maximum values of searching rate of Pediobius foveolatus to H.vigintioctopunctata in Solanum melongena groups and Solanum nigrum groups were 1.85 and 1.94,respectively.On the branches of Solanum melongena,Solanum nigrum,Physalis alkekengi var.francletii and Lycopersicon esculentum,the maximum interfering coefficients in the groups of Physalis alkekengi var.francletii and L.esculentum were 0.50 and 0.28,respectively.P.foveolatus did not parasized the 1^st lavae,the values of searching rate in the 4_th group were the maximum,followed by the 3_rd and 2_nd groups.The searching rate in the Avermectin group was the maximum,followed by the Bt and Celangulin groups.The searching rates in Dichlorovos and Cypermethrin groups decreased sharply compared with the others,while the handling time increased relatively.

Key words: Fertilization, Seasonal flooding, Poplar I-69, Physicomechanical properties, Wood variation