Abstract
Patterns of daily spore release in Pseudoperonospora humuli (Miy. & Tak.) Wilson show similar features to those of other downy mildew fungi. With data of 1967 and 1968 an attempt was made to predict daily spore release in terms of preceding weather factors. Moderate agreement was obtained between measured and predicted spore concentrations within and between these years using multiple regression equations based on two or three weather variables. However, when the same equations were used in 1969 and 1970 the agreement between predicted and measured spore concentrations was poor, suggesting that meteorological factors are not always adequate to explain daily variation in spore release. Biological variables, which are less convenient predictively and hence were not included in the analysis, are thought to be too important to allow for a purely meteorological prediction.
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