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Photo Gallery of Vegetable Problems – Lettuce


General Lettuce Disease Management

Diseases

Anthracnose Downy mildew White Mold, lettuce drop, or Sclerotinia rot

(Click on photo to enlarge)

General Lettuce Disease Management

Common Diseases of Lettuce, New South Wales Department of Primary Industries, Australia. Includes photos of disease symptoms on lettuce.

 

Diseases

Disease: Anthracnose
Pathogen: Microdochium panattonianum

Photo Source: D.A. Inglis

On-Line Resources:

Pacific Northwest Plant Disease Management Handbook: Lettuce (Lactuca sativa) – Anthracnose

Lettuce: Anthracnose, Washington State University Hortsense


Disease: Downy mildew
Pathogen: Bremia lactucae
Host crops: Lettuce and spinach.

Photo Source: Lindsey du Toit

On-Line Resources:

Pacific Northwest Plant Disease Management Handbook: Lettuce (Lactuca sativa) – Downy Mildew

See Lettuce: Downy Mildew. UC Pest Management Guidelines. UC IPM Online, University of California

See Models: Diseases: Lettuce: Downy Mildew. UC IPM Online, University of California


Disease: White Mold, lettuce drop, or Sclerotinia rot
Pathogens: Sclerotinia sclerotiorum
Host cropsBean, various brassica vegetables, carrot, eggplant, lettuce, potatotomato, etc.

  

  

Symptoms resulting from basal infection of the stem from Sclerotinia inoculum in the soil. Aerial infection of lettuce from ascospores released by the apothecia.
Photo Source: Lindsey du Toit Photo Source: Bo-Ming Wu
Photo Source: Bo-Ming Wu

On-Line Resources:

Pacific Northwest Plant Disease Management Handbook: Lettuce (Lactuca sativa) – Drop {Sclerotinia Rot}

UC Pest Management Guidelines: Lettuce: Lettuce Drop. UC IPM Online. University of California.

Diseases of lettuce ( Lactuca sativa ) in Arizona: Leaf drop. Extension Plant Pathology, The University of Arizona.

Evaluation of Products to Manage Sclerotinia Leaf Drop of Lettuce in 2003. The University of Arizona Cooperative Extension.

Important New York Vegetable Diseases: LETTUCE: Drop (Sclerotinia sclerotiorum). Vegetable MD Online, Cornell University.

See Diseases, pests, and other problems common to many vegetables: White mold.