First Report of Stem Rot of Guiana Chestnut (Pachira aquatica) Caused by Pythium splendens

Plant Disease
M TojoH Suzuki

Abstract

Guiana chestnut is a perennial tropical plant that has recently become popular as a potted ornamental in Japan. In October 2001, severe stem rot occurred on Guiana chestnut plants grown in a greenhouse in Mie Prefecture, Japan. Water-soaked lesions appeared initially at the base of the stems and enlarged gradually toward the tops of plants. The affected tissues were softened and turned dark brown. Rotting was observed in the vascular bundles with advanced disease development. Globose hyphal swellings were numerous on diseased stems. Sections from diseased stems were cleaned by washing with running tap-water, placed on water agar, and incubated at 25°C. A species of Pythium was identified on the basis of morphological and cultural characteristics (1) and isolated consistently from the rotted stems of diseased plants. All isolates produced abundant hyphal swellings that were globose, smooth, 12 to 39 μm in diameter, mostly terminal, dark colored, and with dense granulated contents. Zoospores were absent. All isolates were of the compatibility '+ type' with production of sexual organs when paired with cultures of the '- type' tester isolate of Pythium splendens Braun (CBS462.48). Oogonia produced by crossings between Guiana chestn...Continue Reading

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