Percentage mortality of green peach aphid, Myzus persicae by binary combination of Lecanicillium lecanii isolates V2×V2, V3×V3 and V5×V5 after time intervals (2nd, 4th, 6th and 8th day). Error bars indicate SE ± and columns headed by different letters represent significant difference (P < 0.05) according to LSD test.