Sprayable self-encapsulating starch formulations for Bacillus thuringiensis
1990
McGuire, M.R. | Shasha, B.S.
Under glasshouse conditions, various cornstarches andadjuvants were examined as encapsulating agents in sprayable formulations for Bacillus thuringiensis subsp. kurstaki Berliner. When these materials were suspended in water andtested for physical factors such as viscosity, clumping, and retention on plantsurfaces, a range of responses was observed. All formulations tested had acceptable viscosity, butsome formulations clumped. When applied to cotton leaves, certain formulations remained <4 d,whereas others remained >2 wk. One of these formulations containing equal parts ofMira-sperse (a commercially available pregelatinized cornstarch) and sucrose (6% total solids)was selected for testing persistence of B. thuringiensis insecticidal activity againstOstrinia nubilalis Hubner neonate larvae. When encapsulating agents were present, insecticidalactivity decreased over a 2-wk period significantly more slowly than when encapsulating agentswere absent. This indicates an enhanced persistence of B. thuringiensis udder glasshouseconditions. Implications of a sprayable self-encapsulating formulation for B. thuringiensis are discussed.
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