Fusarium proliferatum Pathogenic on Onion Bulbs in Washington

Plant Disease
L J du ToitG Pelter

Abstract

Fusarium oxysporum f. sp. cepae and an unidentified Fusarium species have been reported to cause bulb rot of onion (Allium cepa L.) in Washington (1). In August and September 2002, a salmon-pink discoloration was observed on the outer three to four layers of dry scales of approximately 20% of white onion bulbs of cv. Cometa F1, in each of two 20-acre fields in the Columbia Basin of central Washington. Isolations from the discolored areas of the dry scales onto water agar and potato dextrose agar (PDA) yielded fungal colonies characteristic of F. proliferatum (3). The isolates formed long, V-shaped chains of microconidia on polyphialides. Pathogenicity of the isolates of F. proliferatum was tested on white onion bulbs purchased at a local grocery store. The outermost dry scales of each bulb were removed, and the bulb was inoculated by one of three methods: (i) a 5-mm3 section of the fleshy scales was removed using a scalpel, the wound was filled with a 3-mm2 plug of PDA colonized by F. proliferatum, the plug was covered with the section of scale that had been removed, and the inoculation site was covered with Parafilm; (ii) the basal plate of the bulb was dipped into a suspension of 106 microconidia per ml; or (iii) the basal pl...Continue Reading

Citations

Jan 15, 2019·Microbiology Resource Announcements·Andrew D ArmitageJohn P Clarkson
Nov 27, 2015·Molecular Plant Pathology·Andrew TaylorJohn P Clarkson

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