Changes in Conidia ofMonilinia fructicolain Response to Incubation Temperature

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Abstract
Incubation at 15, 20, or 25.degree. C caused differences in the size, percentage germination, and aggressiveness of 2-wk old conidia from 2 isolates of M. fructicola cultured on potato-dextrose agar. The volumes of M. fructicola conidia were largest at 15.degree. C and smallest at 25.degree. C. The percentage germination was lower on water agar for spores produced at 25.degree. C than for those produced at 15.degree. C but were approximately equal on peach agar. The temperature at which spores were produced influenced their capacity to initiate rot on peach fruit. Three days after inoculation the size of lesions on wounded fruit was largest for conidia from 15.degree. C, intermediate for conidia from 20.degree. C, and smallest for conidia from 25.degree. C. Similar results were found when fruit was inoculated without wounding.

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