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Trends in Entomology   Volumes    Volume 14 
Virulence comparison of two Iranian isolates of Beauveria bassiana Vuillemin against Pseudococcus viburni Signoret (Hemiptera: Pseudococcidae)
Paria Maqsoudi, Samar Ramzi, Arash Zibaee, Seyyed Akbar Khodaparast
Pages: 63 - 70
Number of pages: 8
Trends in Entomology
Volume 14 

Copyright © 2018 Research Trends. All rights reserved

Virulence of two Iranian isolates of an entomopathogenic fungus, Beauveria bassiana, was evaluated against the tea mealybug, Pseudococcus viburni, by topical exposure and determination of enzymatic activity/expression. The values of 2 × 103 and 18 × 105 spore/ml were obtained as the LC50 concentrations of BB3 and Am-118 isolates against third nymphal instars while the LT50 values of the isolates were found to be 3.66 and 6.63 days, respectively. The activities of endo- and exochitanases were assayed in the isolates of B. bassiana that showed higher activity of endochitinase in AM-118 while exochitinase had higher activity in BB3. Interestingly, the two main proteases Pr1 and Pr2 showed higher activity in AM-118 and BB3, respectively. Moreover, preparation of a wettable powder formulation based on spores of BB3 revealed a decrease in viability of spores after 30 days at 30 °C while the formulation showed a significant mortality against nymphs of P. viburni at all intervals after exposure, with the highest value on days 3 and 4. These findings highlighted virulence differences in native isolates of B. bassiana against P. viburni based on results of bioassay and enzymatic virulent factors.


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