Dusky cotton bug, Oxycarenus hyalinipennis has appeared as a serious insect pest of various crops including cotton. The present study was carried out to evaluate the combined effect of some isolates of Beauveria bassiana, Metarhizium anisopliae and Isaria fumosorosea and six synthetic insecticides i.e., triazophos, imidacloprid, bifenthrin, nitenpyram, pyreproxifin and lambda cyhalothrin against O. hyalinipennis. The efficacy of these microbial agents could be enhanced by applying in combination with insecticides. Five concentrations i.e., 1×106, 1×107, 1×108, 2×108 and 3×108 conidia/ml of each isolate of entomopathogenic fungi were used in combination with insecticides against 5th instar nymphs of O. hyalinipennis. The combined treatment of isolates of entomopathogenic fungi and synthetic insecticides caused higher mortality of O. hyalinipennis. Moreover, the combined treatments decreased the adult emergence, male and female longevity, while increased the nymphal duration. The results indicated that these entomopathogenic fungi can provide better control in combination with insecticides and can be used in integrated pest management for reducing the population density of O. hyalinipennis.
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