Pathogenicity and Virulence ofPhytophthora capsiciIsolates from Taiwan on Tomatoes and Other Selected Hosts

In container experiments, black nightshade, cabbage, cucumber, pepper, potato, tobacco, and tomato plants were inoculated with isolates of Phytophthora capsici obtained from either pepper stems or tomato foliage. Inoculum was applied by atomizing foliage or by drenching soil with zoospore suspensions of 1×10 4 zoospores per milliliter. Foliage and stem blight developed on black nightshade, pepper, and tomato plants but not on the other plant species. Tomato and pepper seedlings were inoculated with five isolates of P. capsici by spraying foliage or drenching soil. Response to individual isolates varied from no symptoms to 100% blighting and death of foliar-inoculated pepper plants (.)