An Investigation of the Efficacy of two Iranian Isolates of Metarhizium anisopliae Against Russian Wheat Aphid, Diuraphis noxia (Hemiptera: Aphididae) under Laboratory Conditions

Mohammadi Pour, Ali; Ghazvi, Mehran; Baghdadi, Ahmad; Sheikhi Gorjan, Aziz

An Investigation of the Efficacy of two Iranian Isolates of Metarhizium anisopliae Against Russian Wheat Aphid, Diuraphis noxia (Hemiptera: Aphididae) under Laboratory Conditions

Authors

Ali Mohammadi pour

Mehran Ghazvi

Ahmad Baghdadi

Aziz Sheikhi Gorjan

Abstract

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.

Keywords

Conidia

LC50

LT50

Metarhizium anisopliae

Russian wheat aphid