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.
