Abstract
Oospores of Phytophthora syringae in apple leaves were stored on or beneath soil in an apple orchard from March 1980 to November 1982 and their condition was determined at intervals. A large proportion of oospores in buried leaves was destroyed in the first seven months and most of these were colonized by Microdochium fusarioides: the remnant survived to the end of the experiment. Oospores in surface-stored leaves were degraded progressively, apparently by a variety of micro-organisms, and had declined to numbers of functional spores approximately twice those in buried leaves after two and half years.
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