Efficiency of Some Entomopathogenic Fungi as Biocontrol Agents Against Aphis Fabae Scopoli (Hemiptera: Aphididae)

Abstract

This study evaluated the use of Lecanicillium muscarium and Simplicillium lamellicola isolates, the commercial bioinsecticide Verticillium lecanii and two different insecticides against Aphis fabae at 20°C and 25°C. Dead and live individuals were counted daily following treatment, and Lethal time (LT)<inf>50</inf> and LT<inf>90</inf> values of entomopathogenie fungi (L. muscarium, S. lamellicola and V. lecanii) and insecticides (azadirachtin and imidacloprid) were calculated. LT<inf>50</inf> values forZ. muscarium, S. lamellicola, V. lecanii, azadirachtin and imidacloprid at 20°C were 1.77, 2.13, 2.33, 1.46 and 0.90/day, respectively. LT<inf>50</inf> values at 25°C were 1.93, 1.96, 2.03, 1.28 and 0.86/day, respectively. LT<inf>90</inf> values at 20°C were 4.49, 5.28, 5.13, 3.61 and 2.37, and LT<inf>90</inf> values at 25°C were 4.46, 5.11, 5.03, 3.43 and 2.21, respectively. At the end of Day 7, death ratios were approximately 100% for all treatment groups at both temperatures. Comparisons of the fiducial limits showed that LT values did not vary significantly between temperatures. © 2015 University of Agriculture. All Rights Reserved.