Abstract
An in vitro evaluation was conducted for compatibility of 12 commonly used additives at three different concentrations of (0.1, 0.5, and 1.00%) with Beauveria bassiana through poisoned food technique. The results were expressed as radial growth and growth inhibition of B. bassiana on an additive treated medium. All the additives showed an inhibition in mycelial growth of B. bassiana, either partially or completely depending on their concentrations. On overall basis, carboxylmethyl cellulose (CMC) showed the highest radial growth with a least growth inhibition of (77.16 mm and 8.03%, respectively), followed by Kaolite (69.07 mm and 17.65%, respectively) and silica gel (65.20 mm and 22.25%, respectively). These findings concluded that CMC could be used in formulations of B. bassiana with the highest spore load of 4.67 × 108 spore’s ml−1.
Highlights
The entomopathogenic fungus, Beauveria bassiana (Balsamo) Vuillemin, has attracted significant interest as a biological control agent since it infects a wide range of insect pests in diverse agro-ecosystems (Ambethgar et al 2009)
Radial growth and growth inhibition Among the wetting agents and emulsifiers (T1 to T5) tested, Tween-80 @ 0.5% followed by Tween-80 @ 0.1% showed a maximum radial growth of 51.49 and 50.07 mm with percentage growth inhibition of 38.58 and 40.30%, respectively
On the overall basis among the various additives tested at various concentrations, the highest mean spore load was recorded in control (T13) (5.22 × 108 spores ml−1) that was at par with carboxylmethyl cellulose (CMC) (T12) (4.67 × 108 spores ml−1)
Summary
The entomopathogenic fungus, Beauveria bassiana (Balsamo) Vuillemin, has attracted significant interest as a biological control agent since it infects a wide range of insect pests in diverse agro-ecosystems (Ambethgar et al 2009). Among the different concentrations of humectants’(T6), Glycerol @ 0.5%, followed by Glycerol @ 0.1%, presented maximum radial growth of 52.23 and 52.93 mm and growth inhibition percentage of 37.72 and 36.87%, respectively. Among the desiccants (T7 and T8) tested, Kaolite @ 0.5%, followed by Kaolite @ 0.1%, showed a maximum radial growth of 73.83 and 66.48 mm and a growth inhibition percentage of 11.97 and 20.69%, respectively.
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