Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: December 2, 1997
Publication Date: N/A
Technical Abstract: Improved formulation technology is needed to preserve the viability of fungal weed pathogens in products with commercial potential. Shelf life of granules containing matrix-encapsulated inoculum of Fusarium oxysporum, a pathogen of coca, and Colletotrichum truncatum, a pathogen of hemp sesbania exceeded one year at 25 deg C. Factors that promoted increased shelf life were water activity (aW) of the product and choice of fungal inoculum, such as naturally-stable chlamydospores of F. oxysporum or microsclerotia of C. truncatum. Additionally, encapsulation in a matrix protected the inoculum throughout processing and storage. The matrix chosen was composed of wheat flour and kaolin ('Pesta'). The wheat flour component provided nutrients for proliferation of the fungal bioherbicide agent. Pesta granule production is now in the pilot plant stage using twin-screw extrusion and fluid bed drying equipment.