Search National Agricultural Library (NAL) Digital Collections
Showing item 0 of
from your search.
Evaluation of Soyscreen in an Oil-Based Formulation for UV Protection of Beauveria bassiana Conidia
- Soyscreen oil was studied as a formulation ingredient to protect Beauveria bassiana (Balsamo) Vuillemin conidia from UV degradation. Feruloylated soy glycerides, referred to as Soyscreen oil, are biobased UV-absorbing molecules made by combining molecules of soybean oil with ferulic acid. Conidia stored in Soyscreen oil for 28 wk at 25, 30, and 35°C retained viability as well as conidia stored in sunflower oil, demonstrating that Soyscreen did not adversely affect viability with prolonged storage. For samples applied to glass and exposed to simulated sunlight (xenon light), conidia in sunflower oil with or without sunscreens (Soyscreen or oxyl methoxycinnimate) had similar conidia viability after exposure. These oil formulations retained conidia viability better than conidia applied as an aqueous treatment. However, the 10% Soyscreen oil formulation applied to field grown cabbage (Brassica oleracea L.) and bean (Phaseolus vulgaris L.) plants, did not improve residual insecticidal activity compared with aqueous applications of unformulated conidia or two commercial formulations when assayed against Trichoplusia ni (Hübner) larvae. Our results suggest that the oil applications lose UV protection because the oil was absorbed by the leaf. This conclusion was supported in subsequent laboratory exposures of conidia in oil-based formulations with UV screens applied to cabbage leaves or balsa wood, which lost protection as measured by decreased viability of conidia when exposed to simulated sunlight. As a result, additional formulation techniques such as encapsulation to prevent separation of the protective oil from the conidia may be required to extend protection when oil formulations are applied in the field.
Behle, Robert W. , Compton, David L. , Laszlo, Joseph A. , Shapiro-Ilan, David I.
Beauveria bassiana , entomopathogenic fungi , conidia , biological control agents , acylglycerols , soybean oil , ferulic acid , ultraviolet radiation , viability , insect pests , biological control , solar radiation , plant pests , mycoinsecticides , encapsulation , residual effects , Brassica oleracea var. capitata , cabbage , Phaseolus vulgaris , beans , Trichoplusia ni
- Includes references
- Journal of economic entomology 2009 Oct., v. 102, no. 5
Journal Articles, USDA Authors, Peer-Reviewed
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.