Cladosporium cucumerinum

image of scab on cucumber

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Scab can affect cantaloupe, pumpkin and squash but it mainly infects cucumber. Foliar symptoms include water-soaked spots in early stages that progress into angular or circular necrotic lesions. An area of olive-gray fungal mat may be present in the lesions. Affected fruit have large sunken lesions with watersoaked margins, that later develop corky “scabs” and may ooze sap.

Planting resistant cucumber varieties and use of an effective fungicide program are important. Cleanliness is also important since the fungus may survive in crop litter.

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Publication Revised July 2009

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