Evaluating Host Resistance to Limit Colletotrichum coccodes on Onion

in HortScience

Leaf and neck anthracnose is incited by Colletotrichum coccodes (Wallr.) Hughes, a new foliar disease of onion (Allium cepa L.) in Michigan that has been observed in the state since 2010. Symptoms include elliptical lesions on the leaves, necks, or both that appear bleached with a pale salmon to dark brown center. To develop an effective integrated disease management strategy, field studies were conducted in 2011 and 2012 to evaluate 16 commercial onion cultivars for their susceptibility to the pathogen. The incidence and severity of anthracnose were evaluated weekly following inoculation. Onion cultivars differed significantly in disease severity and incidence; differences between years were also observed. ‘Hendrix’ had the lowest disease severity, whereas ‘Highlander’ and ‘Candy’ exhibited severe onion leaf and neck anthracnose symptoms. Using less susceptible onion cultivars combined with effective fungicides against C. coccodes may limit crop losses for Michigan growers.

Contributor Notes

This work was supported by MSU GREEEN GR11-030 and GR11-020 and the Michigan Onion Committee.

We thank all the members of the Hausbeck Lab for their valuable help; special thanks to A. Worth and J. Munoz for guidance with statistical analysis assistance.

Former Graduate Research Assistant.

Professor.

Corresponding author. E-mail: hausbec1@msu.edu.

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