Effects of Sublethal concentrations of fungus Beauveria bassiana on the reproductive potentials of sawtoothed beetle Oryzaephilus surinamensis on commercial date cultivars

Subject Areas : Plant Protection

Masoud Latifian ¹ , Ebrahim Soleimannejadian ² , Mehran Ghazvi ³ , Mohammad Saeid Mosadegh ⁴ , Jamshid Hayati ⁵

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Received: 2011-05-04 Accepted : 2012-03-17 Published : 2011-02-20

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Abstract :

Beauveria bassiana (Balsamo) is an entomopathogenic fungus one of Oryzaephilus surinamensis L.. In this study effects of sublethal doses of  pathogen on  reproductive potential , the amount of oviposition and the percentage of egg hatching of sawtooth beetles were investigated in terms of feeding on three Dates cultivars including Sayer, Zahedi and Deiri long in vitro condition. Adults were treated by 5 sublethal doses including 102, 5×102, 103, 5×103 and 104 Spores in ml and compared by control. Then, the sublethal doses of reduced reproductive potential of each cultivar  were calculated by using Log-Probit analysis method. The tested doses of pathogen had decreasing effects on fertility index. The synergist of fungal pathogen and cultivars on reduce fertility rates were gradually by the increasing pathogen doses. Minimum and maximum sublethal doses for reducing the 50 percent amount of oviposition were showed in population grew on Zahedi and Deiri cultivars and equivalent to 1.497×103 and 4.963×103 spores/ml respectively. Minimum and maximum sulethal doses for reduction 50 percent egg hatching were showed in population grew on the Zahedi and Sayer cultivars and, equivalent to 6.316×103 and 8.28×103 spores/ml respectively. The results of this study showed that the fungus B. bassiana had a significant effect in reducing the reproduction potentials. The pathogen ability to reduce the reproduction potentials was in addition depended on the fungi dose and Date cultivars that feeding by the pest.

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