Effects of the entomopathogenic fungus, Beauveria bassiana (Bals. Criv.) Vuill on ‎survival and population growth parameters of Myzocallis coryli Goetze

This study was carried out to determine the effects of the entomopathogenic fungus, Beauveria bassiana (Bals. Criv.) Vuill, on survival and population growth parameters of the Myzocallis coryli Goetze one of important pest of hazelnut. Effect of LC30 on development, reproduction and life table parameters of the Filbert aphid were studied under laboratory conditions. The LC50 values of IRAN429 and Z-1 isolates were 9.86×104 and 1.03×106 conidia ml-1. The fungal treatment significantly (P<0.005) reduced nymphal period, life span and fecundity of the aphid in comparison with control. The rm values of IRAN429 and Z-1 in LC30 were 0.15 and 0.16 female/female/day respectively which was significantly reduced in comparison with control aphid (0.18 female/female/day). The lifelong of IRAN429 (31.75 day) and Z-1 (39.45 day) treatments were had significant difference with control (43.50 day). The fecundity value of IRAN429, Z-1 and control were 31.75, 39.45 and 78.41 (nymph/ female) that have significant difference with each other. Finite rate of increase (λ) was significantly reduced in treated aphids (IRAN429= 1.17 and Z-1=1.17 female/female/day) compared to control (1.19 female/female/day) treatment. The results of the present study showed that due to the significant effect of pathogenic fungi in sub-lethal concentration on the survival and reproduction indicators of aphids, it can be used in the integrated and biological management program of target pests.