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United States Department of Agriculture

Agricultural Research Service

Research Project: AUGMENTATIVE BIOLOGICAL CONTROL AND MASS REARING FOR BENEFICIAL AND PEST INSECTS

Location: Biological Control of Pests Research Unit

Title: Selection of Wetting Agent for Dried Conidia of two Beauveria bassiana Strains from Different Production Systems to Control Tarnished Plant Bugs

Authors
item Jin, Xixuan
item Streett, Douglas
item Dunlap, Christopher
item Lyn, Margaret

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: February 27, 2008
Publication Date: July 27, 2008
Citation: Jin, X., Streett, D. A., Dunlap, C. A., Lyn, M. E. Selection of Wetting Agent for Dried Conidia of two Beauveria bassiana Strains from Different Production Systems to Control Tarnished Plant Bugs. Meeting Abstract. 2008

Technical Abstract: The hydrophilic–lipophilic balance (HLB) number was used to select surfactant, TDA (polyoxy-ethylene tridecyl ether) with a range of HLB numbers in formulation development of two Beauveria bassiana strains, NI8 and GHA produced from different systems. The results indicated that optimal HLB number of TDA for B. bassiana strain NI8 was 8, while the optimum HLB number for strain GHA was 10. The optimized TDA surfactants required significantly less wetting times, suspended higher conidial levels, and promoted conidia germination of strain NI 8. Bioassay results indicated that there were no significant differences in mortalities because of surfactant HLB numbers. These results suggest optimization based upon HLB number will not negatively impact parameters associated with efficacy, while providing desirable physical properties.

Last Modified: 8/29/2014