Abstract
A powdery mildew disease of greenhouse tomato first appeared in the Fraser Valley of British Columbia in 1995. The causal agent was identified as Erysiphe orontii. Host range studies were conducted using uniform levels of inoculum of the pathogen under greenhouse conditions. Of 26 tomato cultivars inoculated, cv. DRW4409F1 had the least powdery mildew infection. Twenty-five of the 26 tomato cultivars tested, as well as eggplant cv. Early Long Purple, nightshade and tomatillo, were susceptible to E. orontii. Tobacco and potato (cv. Epicure) had slight infection. Cultivars of pepper, potato, corn, strawberry, raspberry, bean, feverfew, borage, delphinum, petunia, impatiens, gazania, morning glory, zinnia, african daisy, cosmos, wild buckwheat, curled dock, and knotweed were not susceptible to E. orontii. This study indicates that resistance to powdery mildew of tomato is available and should be explored in breeding programs to develop powdery mildew-resistant cultivars for the greenhouse industry. Key words: Host resistance, Lycopersicon esculentum, powdery mildew, Solanaceae
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