Potential for biocontrol of sclerotinia rot of carrot with foliar sprays of Contans WG (Coniothyrium minitans)
2009
McQuilken, Mark P. | Chalton, David
A glasshouse and field trial were conducted to evaluate foliar sprays of Contans WG (Coniothyrium minitans) conidial suspensions for control of sclerotinia rot of carrot and infection of Sclerotinia sclerotiorum sclerotia by C. minitans. In the glasshouse trial, foliar sprays (1x10(4)-10(8) conidia mL-1) decreased the viability of sclerotia recovered from diseased plants and increased infection by C. minitans. In the field trial, three successive foliar sprays applied at 14-day intervals failed to reduce foliage disease severity, but significantly reduced viability of sclerotia recovered from diseased plants/crop debris and increased infection by C. minitans. No significant differences in sclerotial viability or infection were observed between two conidial concentrations (2.4 and 4.8x10(6) conidia mL-1). Foliar sprays of Contans WG have potential for reducing viability of sclerotia produced on diseased foliage.
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