International Journal of Agriculture Forestry and Life Sciences

Yazarlar: Nihal Magdy BAGY, Mohaemd Ahmed ABDEL-RAHMAN, Mohamed Abou-elfadl MORSY, Gaber Hasan ABOU-ELHAGAG

Konular:Fen

Anahtar Kelimeler:: Beauveria bassiana,Endophyte,Onion plant

Özet: Beauveria bassiana (Balsamo) was successfully isolated from the leaves of onion plants, Allium cepa Lind. cultivated in the Experimental Farm of AssiutUniversity. Morphological characters of the fungus were described. Moreover, the pathogenicity of this isolate was assayed (dipping technique) against onion thrips, nympal and adult stages (In vitro). Six concentrations (13x104, 29x104, 42x104, 64x104, 86x104 and 104x104 conidia / ml) were used. Our results demonstrated that mortality increased as the conidial concentrations increased. It seems that the concentration of 104 x 104 conidia / ml is an effective to get sufficient mortality for the nymphal stage (92.50%) and adult stage (88.46%). In general, results refer that B. bassiana isolated from onion leaves at the concentration of 104x104 spores/ml is effective to get about 90% mortality for the onion thrips regardless of the pest stage. Also, virulence of B. bassiana against onion thrips (nymphal and adult stages) elucidated that the fungus was more effective on nymphal than adult stage as indicated by low value of LC50 and LC95. The present results reflect the potential role that can be played by B. bassiana endophyte in the biological control of thrips infesting onion plants under field conditions.

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