Abstract
Phytophthora diseases of flowering potted plants were investigated from 1989 to 1999. A total of 16 new diseases, which have not been formally reported in Taiwan, were found and described in the study. An atypical type of Phytophthora capsici was found to cause wilt and death of azalea. P. citrophthora attacked was detected from the infected diseased tissues of seven species of plants including Aphelandra sp. (whole plant wilt), bougainvillea (leaf and flower blight), hibiscus (root rot), flame vine (leaf and flower blight), desert rose (young tissue and stem blight), chincherinchees(wilt and blight of whole plants), and Aeschynanthus sp. (wilt). While P. palmivora caused flower blight of curcuma and wilt of garden petunia. Besides, P. cinnamomi was isolated from the rotted basal stem tissues of begonia, P. citricola from the blighted leaves of Taiwan pleione, and P. cryptogea from the diseased root tissues of sweet alyssum. Disease symptoms similar to those occurring in natural conditions were reproduced when each host was inoculated with zoospore suspension of their respective isolates of Phytophthora species in pathogenicity. Same species of Phytophthora was reisolated from all artificially infected tissues. Among these new diseases, P. capsici on azalea, P. cinnamomi on begonia, P. citricola on Taiwan pleione, P. citrophthora on anthurium, P. cryptogea on sweet alyssum, P. parasitica on Aeschynanthus sp., chincherinchees, flame vine and desert rose, and P. palmivora on curcuma have not been described in any other places previously.
Published Version
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