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Delivery systems for biological control agents to manage aflatoxin contamination of pre-harvest maize
- While soil application of a competitive non-toxigenic Aspergillus flavus strains is successful in reducing aflatoxin contamination in certain crops, direct application to aerial reproductive structures could be more effective for maize. A sprayable, clay-based water-dispersible granule formulation was developed to deliver non-toxigenic A. flavus strain K49 directly to maize ears. The efficacy of the K49 water-dispersible granule in mitigating aflatoxin in maize (Zea mays L.) was evaluated. Field studies were conducted to compare K49 colonization and effectiveness in reducing aflatoxin contamination when applied either as a soil inoculant or as a directed spray in plots infested with toxigenic strain F3W4. Fifty percent of non-toxigenic A. flavus was recovered from non-treated controls and from plots soil inoculated with K49 on wheat. In spray treatments with formulated or unformulated K49 conidia, over 90% of A. flavus recovered was non-toxigenic. Soil-applied K49 reduced aflatoxin contamination by 65% and spray applications reduced contamination by 97%. These findings suggest direct spray application of non-toxigenic A. flavus strains may be better than soil inoculation at controlling maize aflatoxin contamination and that a water-dispersible granule is a viable delivery system for maintaining viability and efficacy of the biological control agent, K49.
Lyn, M.E. , Abbas, H.K. , Zablotowicz, R.M. , Johnson, B.J.
Zea mays , preharvest treatment , on-farm food safety , plant pathogenic fungi , toxigenic strains , Aspergillus flavus , field experimentation , biological control , biological control agents , fungal antagonists , nonpathogenic strains , granules , microbial pesticides , pesticide application , spraying , soil , aflatoxins , secondary metabolites
- Includes references
- Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment 2009 Mar., v. 26, no. 3
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.