an investigation of the efficacy of two iranian isolates of metarhizium anisopliae against russian wheat aphid, diuraphis noxia (hemiptera: aphididae) under laboratory conditions

نویسندگان

علی محمدی پور

محقق بخش تحقیقات حشره¬شناسی کشاورزی، مؤسسه تحقیقات گیاهپزشکی کشور، تهران مهران غزوی

استادیار بخش تحقیقات حشره¬شناسی کشاورزی، مؤسسه تحقیقات گیاهپزشکی کشور، تهران احمد بغدادی

استادیار، دانشکده کشاورزی دانشگاه پیام نور - ماهدشت کرج عزیز شیخی گرجان

استادیار بخش تحقیقات حشره¬شناسی کشاورزی، مؤسسه تحقیقات گیاهپزشکی کشور، تهران

چکیده

in this study, the effects of two metarhizium anisopliae isolates, originally obtained from red palm weevil (rhynchophorus ferrugineus) and a beetle (parandra caspica), on adults of russian wheat aphid diuraphis noxia were studied under laboratory coditions. after a determination of the minimum & maximum concentrations, the adults were treated with conidial concentrations of 1×103 to 1×106 conidia/ml to determine the lc50 & lc90. demi001 proved to possess the lowest lc50 (1.7×103 conidia/ml) whilst demi002 the highest (2.5×106 conidia/ml). the lowest lt50 was obtained 1.75 days for demi001 at 1×105/5 conidia/ml. in a completely randomized block design, the mortalities caused by the isolates on the 6th & 10th days were as follows: on the sixth day and for the concentration of 106 conidia/ml, isolates demi001 (32.22%±6.92), demi002 (22.28%±4.39) and for the tenth day, the isolates demi001 (41.9%±6.42), demi002 (28%±4.78) were observed as significantly different.

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