First report of fusarium wilt caused by Fusarium oxysporum f. sp. canariensis on Canary island date palm in Texas and South Carolina.

摘要

Canary Island date palm (Phoenix canariensis) is native to the Canary Islands and widely grown throughout the world as an ornamental. At a home site in Austin (Texas) in May 2008 and a commercial site near Charleston (South Carolina) in December 2009, declining Canary Island date palms were observed. Symptoms included individual leaves with chlorotic or necrotic leaflets on one side of the leaf blade (one-sided wilt or death) and a distinct reddish brown stripe along the petiole and rachis. Cross sections through the petiole or rachis exhibited discoloration of internal tissue. Based on morphological characteristics, pathogenicity tests and molecular investigation (nucleotide sequence comparison against databases), the causal agent was identified as F. oxysporum f.sp. canariensis. This is thought to be the first report of Fusarium wilt of Canary Island date palm in Texas and South Carolina. Previously, in the USA, the disease had only been noted in California, Florida, and Nevada.Digital Object Identifier http://dx.doi.org/10.1094/PDIS-11-10-0777