Abstract
Segregation of rotted from sound clusters can establish the proportional weight of moldy fruit in hand-picked samples of wine grapes but not in mechanically harvested grapes, which have a large proportion of broken clusters and berries. The Howard mold-count method commonly used for tomatoes was therefore tested for measuring the amount of moldy fruit in mechanically harvested grapes. Berries infected in the laboratory with two separate fungi (Botrytis cinerea and Rhizopus stolonifer) were combined with sound fruit in various proportions and then macerated in a blender. Microscope counts of fungus fragments correlated satisfactorily with the controlled blends of molded berries. The method appears to be applicable for use under field conditions.
- Accepted May 1973.
- Published online January 1973
- Copyright 1973 by the American Society for Enology and Viticulture
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