Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Dickeya fangzhongdai causing soft rot of onion in New York State.

Abstract

In early July 2014, an outbreak of soft rot disease of onion (Allium cepa) occurred in Orange County, New York, USA. Symptoms developed following rainy, hot, humid weather and included chlorosis, maceration of leaves, browning, and plant collapse within a few days. Bulbs from diseased plants appeared normal, but inner tissues were macerated. Disease was first apparent in a field of red onions cv. Redwing; later yellow onions (cultivar unknown) in an adjacent field were symptomatic. The causal pathogen was isolated and identified as Dickeya fangzhongdai based on genomic DNA sequences and pathogenicity analyses. This is thought to be the first report of D. fangzhongdai causing soft rot of onion in New York, USA.