VIEW ARTICLE

Selective Medium for Detection of Inoculum of Monilinia spp. on Stone Fruits. Douglas J. Phillips, Research Plant Pathologist, Agricultural Research Service, U.S. Department of Agriculture, Market Quality and Transportation Research Laboratory, 2021 South Peach Avenue, Fresno, California 93727; John M. Harvey, Research Leader, Agricultural Research Service, U.S. Department of Agriculture, Market Quality and Transportation Research Laboratory, 2021 South Peach Avenue, Fresno, California 93727. Phytopathology 65:1233-1236. Accepted for publication 27 May 1975. DOI: 10.1094/Phyto-65-1233.

Stone fruits from California orchards were washed and the wash water plated on a medium selective for Monilinia spp. Inoculum on the surface of sound stone fruits ranged from 0 to 170,000 propagules per fruit when measured at or near harvest. Propagules believed to be ungerminated conidia of M. fructicola commonly were found covering sound fruit in orchards where sporulation had occurred on nearby infected fruit. There was a detectable increase in the amount of inoculum present on the fruit late in the harvest season.