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Abstract
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Abstract: Trichoderma harzianum help plants by increasing their growth and yield. Recent researches showed that T. harzianum defend plants against the pathogens and pests. There is considerable research supporting the use of this fungus in plant pathogens management, but the number of researches that have focused on its effect on insect pests control is quite few. In this research, we examined the ability of T. harzianum to control of Aphis fabae, on faba bean plant in Iran. The native strain from Iran was used as plant treatment to evaluate its effect on A. fabae population growth parameters. The fungi influenced phenology of faba bean by decreasing the growing days. In the other part of the study, the fungi showed great effects on biology and demographic traits of Aphis fabae. Adult mortality grown on the plants treated with fungi and control, were 12±1.15 and 10±2.09, respectively. The other parameters that changed significantly were weight, development, adult preoviposition period (APOP) and total preoviposition period (TPOP). Also, the intrinsic rate of increase (r) as the most important life table parameters, changed significantly in the aphids grown on the plant treated with fungi and control were 0.23±0.002 and 0.42±0.003 day-1, respectively. Moreover, gross reproductive rate (GRR) and net reproductive
rate (R0) in the treatments were changed significantly in comparison with control. Therefore, the effect of T. harzianum on Aphis fabae life table parameters and adverse effects on fitness of the pest could be noticed as successful bio-pesticide in the near future
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