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Ecology and Epidemiology

Size, Nuclear Number, and Aggressiveness of Botrytis cinerea Spores Produced on Media of Varied Glucose Concentrations. Douglas J. Phillips, Plant pathologist, Agricultural Research Service, U.S. Department of Agriculture, Quality Maintenance, Genetics, and Transportation Research Unit, Horticultural Crops Research Laboratory, Fresno, CA 93727; Dennis A. Margosan(2), and Bruce E. Mackey(3). (2)Biological technician, Agricultural Research Service, U.S. Department of Agriculture, Quality Maintenance, Genetics, and Transportation Research Unit, Horticultural Crops Research Laboratory, Fresno, CA 93727; (3)Consulting statistician, Western Regional Research Center, Albany, CA. Phytopathology 77:1606-1608. Accepted for publication 27 May 1987. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1987. DOI: 10.1094/Phyto-77-1606.

Spores of Botrytis cinerea were produced at 15 C on a defined medium containing 20, 150, or 300 g/L of glucose. Increasing the glucose in the growth medium resulted in an increase in the volume and nuclear number of spores and increased their aggressiveness when inoculated on rose flowers. The effect of increasing the nuclear number on aggressiveness could not be separated from the effect of increased spore volume.