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Foliar sprays of a nonswelling chlorite mica clay were applied to leaves of greenhouse-grown long English cucumber (Cucumis sativus L.) plants, either before or after an artificial inoculation with powdery mildew ( Sphaerotheca fuliginea (Schlech.:Fr.) Poll.) and to field-grown wine grapes (Vitis vinifera L.) before natural inoculation with powdery mildew (Uncinula necator (Schwein.) Burrill). In all cases, the clay sprays did not eradicate the pathogen, but resulted in significant reductions in disease severity. In cucumber, a single spray of 0.5% clay reduced colony numbers on leaves by up to 60%. Spraying after inoculation was generally more effective than spraying before inoculation. In grapes, repeated sprays of either 2% or 4% clay were applied through the season to 'Reisling' and 'Chancellor' vines. Four percent clay reduced the amount of leaf surface covered by mildew by 22% in 'Reisling' and 51% in 'Chancellor'. Both concentrations reduced the incidence of mildew on clusters and canes. No treatment effects were observed on fruit quality. Our results demonstrate that foliar sprays of clay can reduce the severity of Sphaerotheca fuliginea and Uncinula necator on cucumbers and grapes, respectively. Powdery mildew fungi are arguably the most common and destructive pathogens of greenhouse crops and wine grapes. These fungi can develop rapidly in favorable greenhouse environments and outside in warm summer climates, causing considerable economic dam- age to crops such as cucumber and grape. In Canada, the main powdery mildew pathogen of greenhouse-grown long English cucumber plants is Sphaerotheca fuliginea and of grapes is Uncinula necator. Recommended control practices include the growing of resistant va- rieties and application of fungicides (British

Foliar Sprays of Clay Reduce the Severity of Powdery Mildew on Long English Cucumber and Wine Grapes