BIOLOGICAL CONTROL STUDY ON MITE SPECIES TETRANYCHUS UR77CAE KOCH ON OKRA PLANTS IN ISMAILIA GOVERNORATE BY THE PREDACEOUS MITE PHYTOSEIULUS PERSINILTS(ATHIAS-HENRIOT) (ACARI : TETRANYCHIDAE : PHYTOSEIIDAE)

Document Type : Original Article

Author

Plant Protection Research Institute, Agricultural Research Center, Giza, Egypt

Abstract

A preliminary study was conducted during two successive seasons 2003-2004 on okra plants at Kasasin, Isrmlia Governorate to control the two-spotted spider mite, Tetranychus urticae Koch by releating the predatory mite, Phytoseiduspersimi//sAMias-Hendot at the rate of 10 or 5 Individuals/bit using bean leaflets harbouring the predator individuals. In 2003 season the predator was released on Apra 12.. Few predators were recorded on the treated bits during the different post-count probably due to the prevailing unfavourable environmental condition where several hot spells coincided with the time of predator release which might have negatively affected the predator activity. In 2004 season, the predator was early released on March 12th and satisfying results were obtained. Releasing the predator using bean leaflets at the rate of 10 or 5 individuals/bit greatly reduced the T. wtkae population 4 weeks of the predator release. Mean reduction of the pest population over the everimental period was 97.8% (10 predators/bit) and 96.9% (5 praetors/bit) when using bean leaflets carrying the predators, respectively.

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