Be on the Watch for Onion Diseases

Thursday, June 19, 2014

Cool, wet weather this past week is conducive to disease development in onion fields. Monitoring is necessary for Alternaria sp., leaf blotch (Cladosporium sp.) and Stemphylium sp. on direct seeded onions as these diseases were found in onions grown from sets.

Please consult the Guide to Pest Management in Onion for more information on control options. 

To learn more about Stemphylium, a devasting onion disease, please see this informative article which has good pictures to help you identify the disease.