Abstract
Hop plants in hills in three or four hop yards were assessed visually during severe and mild epidemics of downy mildew in the Yakima Valley of Washington. Several methods of analysis were used to investigate the spatial pattern of hop plants systemically infected with Pseudoperonospora humuli during the two types of epidemics. When disease incidences were low during the mild epidemics and early in the development of the severe epidemics, distributions associated with aggregation of disease provided a good representation of the frequency distribution of systemically infected shoots (...)
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