RELEASE DIFFERENT LEVELS OF NEOSEIULUS CALIFORNICUS ( MCGREGOR )ON DIFFERENT TETRANYCHUS URTICAE KOCH DENSITIES ON POTTED BEAN PLANTS UNDER A SCREEN GREENHOUSE CONDITIONS (ACARI:PHYTOSEIIDAE & TETRANYCHIDAE)
Abstract: Under a screen greenhouse conditions the predatory mite, Neoseiulus ( Amblyseius ) californicus (McGregor ) was released with two levels of adults at the rate of three females and one male or with six females and one male of the predator individuals/pot on bean plants inoculated 7 days prior with different densities of Tetranychus urticae Koch .The obtained results indicated that populations of T. urticae were comparatively high after 7 and 14 days (from the predator release) when the predatory mite, N. californicus was released with a low level than those obtained with the high level of predator release .On the other hand, higher reductions of T. urticae were obtained after 7 and 14 days when the predator was released with a high rate .That indicated the importance of the initial ratio between numbers of prey and predator for regulation of prey density. High numbers of the predator individuals were subsequently recorded with this high release rate. Also, the prey predator ratios were very low as a result of high reduction of the T. urticae populations.
Publication year 2009
Pages 1-10
Organization Name
Author(s) from ARC
External authors (outside ARC)
    مصطفى حلمي موافي2 كلية الزراعة – جامعة الأزهر
Publication Type Researsh & Applied Activities
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