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Your Position :Home->Past Journals Catalog->2015年52 No.5

Biological control of the two-spotted spider mite Tetranychus urticae (Acari: Tetranychidae) by the predatory mite Phytoseiulus persimilis (Acari: Phytoseiidae) on eggplant
Author of the article:GONG Ya-Jun** WANG Ze-Hua WANG Su ZHU Liang SHI Bao-Cai WEI Shu-Jun***
Author's Workplace:Institute of Plant and Environmental Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
Key Words:Phytoseiulus persimilis, Tetranychus urticae, biological control, release rate, reproduction rate
Abstract: [Objectives]  To evaluate the effectiveness of the predatory mite Phytoseiulus persimilis as a biological control for the two-spotted spider mite Tetranychus urticae on eggplant at different release rates and prey densities. [Methods]  The biological control effectiveness and reproductive rate of P. persimilis were investigated under different release ratios, (predator: prey) 110, 130 and 150, and T. urticae population densities, 10/leaf, 30/leaf and 60/leaf. [Results]  All three release ratios achieved 100% mortality of T. urticae after 14, 22 and 26 days, respectively. The effectiveness of P. persimilis as a biological control also improved with time at different densities of T. urticae; there was no significant difference in the number of surviving T. urticae after 6 d and 100% mortality was achieved after 20 days irrespective of the original prey density. This suggests that the predatory efficiency of P. persimilis is influenced by predator-prey ratio but not by prey density. The reproductive rate of P. persimilis was greater at lower release rates and higher T. urticae densities, reaching a peak value of 643% at the release rate of 150, and 893% at a T. urticae density of 60/leaf. [Conclusion]  Our results indicate that P. persimilis is an effective biological control agent for the two-spotted spider mite on eggplant. We recommend the early release of the P. persimilis when the density of T. urticae is low. A predator/prey ratio of 110-130 appears sufficient to obtain high mortality of T. urticae with the release of relatively few P. persimilis.
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