تاثیر چند جدایه ایرانی قارچ (Fungi: Ascomycota) ((Vuillemin Beauveria bassiana روی شته روسی گندم Diuraphis noxia (Hom.: Aphididae) در شرایط آزمایشگاهی

In this study, the effects of four Beauveria bassiana isolates, obtained from the soil of Fashand, Atashgah and Ghare-agaj and one from a grass hopper Sphingonotus sp. on the adults of Russian wheat aphid Diuraphis noxia were studied under laboratory conditions. After determination of the minimum and maximum concentrations, the adult Russian wheat aphid was 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 6^th & 10^th days were as follows:
At 1×10 ⁵ spore/ml, on 6^th 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 10^th  days, at 1×10 ⁵ spore/ml DEBI002(45.1% ± 1.23), DEBI015(39.48% ± 7.21) and DEBI001(39.43% ± 2.65) were classified as level A & DEBI010 (16.23% ± 3.9) as level B (Duncans Muitple Range Test).