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ISHS Acta Horticulturae 736: III International Date Palm Conference

BIOLOGICAL CONTROL OF RED PALM WEEVIL, RHYNCHOPHORUS FERRUGINEUS (COL.: CURCULIONIDAE) BY THE ENTOMOPATHOGENIC FUNGUS BEAUVERIA BASSIANA IN UNITED ARAB EMIRATES

Authors:   R. El-Sufty, S.A. Al-Awash, A.M. Al Amiri, A.S. Shahdad, A.H. Al Bathra, S.A. Musa
Keywords:   conidia, mass production, storage, virulence, spray, dusting
DOI:   10.17660/ActaHortic.2007.736.36
Abstract:
Biological control of the red palm weevil, Rhynchophorus ferrugineus was studied using the local strain, UAE-B2 of the entomopathogenic fungus Beauveria bassiana. For mass production of dry conidia, a new economic simple medium containing granulated rice was evaluated and used. The culture medium yielded 5.2 mg conidia/cm2 with a potentiality of 91.7% on adult weevils. The conidia were stored at 10C for 13 months without decrease in its virulence. Preliminary field investigations were carried out in date palm plantations at Ras Al Khaimah to evaluate the efficacy of the fungus. Spraying date palm trees with an oil formulation containing 5 x 107 con. / ml at a rate of 5 L / tree caused a mortality of 13.7-19.2% in the adult population during the three weeks after application with a monthly delayed mortality of 2.3-12.5% in the following four months. Dusting a date palm tree with 40 g of a powder formulation containing 5% conidia killed 8.9% of adult population during the three weeks after application and caused monthly delayed mortality of 4-5.9% in the following three months.

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