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Colletotrichum Species Isolated from Massachusetts Cranberries Differ in Response to the Fungicide Azoxystrobin

T. Giorgio, L. S. Adler, and H. A. Sandler

April 2020

Brief

Fruit rot is the most prevalent disease of cranberry (Vaccinium macrocarpon). Colletotrichum species (C. acutatum and C. gloeosporioides) have been identified as cranberry fruit rot pathogens. Resistance to azoxystrobin by Colletotrichum has been documented in other fruit crops. Azoxystrobin, a quinone-outside inhibitor fungicide, was approved for use in cranberry in 2003, and a single application delivers between 78 and 202 ppm under typical chemigation conditions. Twenty-nine isolates were collected from diseased fruit in commercial Massachusetts cranberry farms. Six isolates were collected prior to registration of azoxystrobin (unexposed), and 22 isolates were from locations where the fungicide had been applied (exposed). This study is the first report of the relative sensitivity of exposed and unexposed field-acquired cultures for the cranberry fruit rot pathogen, Colletotrichum, to azoxystrobin.

doi:10.1094/PHP-10-19-0075-BR

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