Efficacy of Iranian Isolate of Beauveria bassiana against Russian wheat aphid Diuraphis noxia (Mordvilko) (Homoptera:Aphididae) on the Laboratory conditions

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In this study, the effects four Beauveria bassiana isolates, obtained from soil of Fashand, Atashgah & Ghare-agaj and one from a grass hopper Sphingonotus.sp on adults of adult Russian wheat aphid Diuraphis noxia was studied under laboratory conditions. After determination of the minimum & maximum concentrations, the adults Russian wheat aphid were treated with conidial concentrations of 1×103 to 1×10 6 spore/ml to calculate LC50 & LC90. DEBI002 proved to have the lowest LC50 (4 ×105 spore/ml) whilst DEBI010 showed the highest LC50 (2.5×106 spore/ml). The lowest LT50 was obtained 2.8 days for DEBI002 at 1×10 6 spore/ml. In a completely randomized block design, the mortalities caused by the isolates on 6th & 10th days was as follows: At 1×10 5 spore/ml, on 6th days DEBI002(34.95% ± 3.64), DEBI015(37.1% ± 6.11) & DEBI001 (32.35% ± 1.3) were classified as level A & DEBI010 (18.74% ± 1.91) as level B. on 10th days, at 1×10 5 spore/ml DEBI002(45.1% ± 1.23), DEBI015(39.48% ± 7.21) & DEBI001(39.43% ± 2.65) were classified as level A & DEBI010 (16.23% ± 3.9) as level B (Duncans Muitple Range Test).

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