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Root and Foot Rot of Loquat in Taiwan Caused by Phytophthora

June 1998 , Volume 82 , Number  6
Pages  651 - 656

L. L. Chern , Culture Collection Center, Food Industry and Research Institute, HsinChu, Taiwan , P. J. Ann , Taiwan Agricultural Research Institute, Wufeng, Taiwan , and H. R. Young , Chiayi Agricultural Experimental Station, Chiayi, Taiwan

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Accepted for publication 23 February 1998.

Loquat trees growing in central Taiwan were inflicted with a disease causing wilting and death of plants due to severe foot and root rot. The vascular tissues of all infected plants turned brown. Typical as well as atypical isolates of Phytophthora parasitica were isolated from the diseased basal stem and root tissues but not from the discolored vascular tissues. Symptoms observed in the field were reproduced when roots and stems of loquat seedlings were inoculated with zoospores of atypical isolates of P. parasitica; whereas only fibrous root rot resulted from inoculation with typical isolates of P. parasitica. Atypical isolates could be differentiated from the typical isolates of P. parasitica by several characteristics, including colony appearance, partial caducous sporangia, size of oospore, growth at 36°C, mycelial soluble protein patterns, and pathogenicity.

Additional keywords: atypical strain

© 1998 The American Phytopathological Society