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The Role of Chemical Additives in Enhancing the Efficacy of Beauveria bassiana and Metarhizium anisopliae Against the Potato Tuber Moth Phthorimaea operculella (Zeller) (Lepidoptera:Gelechiidae)
Abstract: Susceptibility of the potato tuber moth larvae Phthorimaea operculella to the entomopathogenic fungi Beauveria bassiana and Metarhizium anisopilae were detected. The LC50 of B. bassiana and M. anisopliae against P. operculella neonate larvae were 3.4x10 and 8.61x107 conidia/ml, respectively. The metabolic acids (oxalic and citric acids) scored the highest enhancement in the efficiency of B. bassiana and M. anisopliae against the first larval instar of P. operculella. Some chemical additives caused an increase in the efficiency of the tested fungi against the target insects.