Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Verticillium dahliae causing dieback of highbush blueberry (Vaccinium corymbosum) in Oregon and Washington.

Abstract

In the spring of 2011, 2013, 2015 and 2016, symptomatic plants of the blueberry (Vaccinium corymbosum) cultivarsAurora, Blue Ribbon, Bluetta and Cargo from Oregon and Washington, USA, were sent to the Oregon State University Plant Clinic for diagnosis. Symptoms included foliar chlorosis, reddening, blackening of either part or the entire stem followed by stem dieback, vascular discolouration in the lower stems and occasional wilt. The diseased plants were scattered in the fields, with incidence ranging from less than 5 to 40% of acreage. The causal pathogen was identified as Verticillium dahliae based on morphological, molecular and pathogenicity analyses. This is thought to be the first report of V. dahliae causing disease of highbush blueberry in the USA.