Agriculture (Not Published)

Agriculture (Not Published)

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

Authors
Ali Mohammadi pour
Ahmad Baghdadi
Mehran Ghazavi
Asadollah Mirkarimi
Najmeh Nikpour
Abstract
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).
Keywords
Beauveria bassiana
LC50
LT50
Russian wheat aphid
Spore