Problem of the Week

This Week: July 15, 2003:

Hail Damage and Anthracnose on Pumpkins

see below


This Week:

Hail damage and Anthracnose on Pumpkins
See Below:

The recent spell of warm and rainy weather during the first 10 days of July has led to an outbreak of anthracnose in some pumpkins and other vine crops. Growers should check their fields soon and begin a fungicide application program shortly if they have not already done so. Consult page 213 of the 2003 OH Vegetable Production Guide for recommended materials. The online edition is available from the VegNet homepage.

Photos by Andy Wyenandt, Plant Pathology

Hail damage on a pumpkin leaf

Top side of leaf showing anthracnose lesions

Upper surface with more anthracnose lesons plus holes in the leaf caused by hail.

Close-up view of anthracnose lesions on the underside of the pumpkin leaf.

Another close-up view of anthracnose lesions on the underside of the pumpkin leaf. Notice how the lesion attacks the main vein of the leaf and collapses it. This will lead to necrotic areas on the leaf.



Previously....

From March 10, 2003,
Cucurbit Yellow Vine Decline (CYVD)
Click Here! to see a short Powerpoint presentation on this disease including pictures (From OK State Univ.)
From September 13, 2002, Sunscald on pumpkins
From August 13, 2002, How to Distinguish Between Symptoms of Squash Vine Borer versus Bacterial Wilt
From July 18, 2001,Powdery Mildew on Summer Squash
From September 21, 2000, Bird Damage and Fusarium Fruit on Pumpkins
From June 24, 2000, Soil Crusting
From August 18, 1999, Watermelon Mosaic Virus on Pumpkins
From July 13, 1999, Spider Mites on Pumpkin Leaves
From July 1, 1999,
  • Command Carryover Affects Tomatoes
  • Bacterial Wilt in Muskmelons
  • Drought Conditions
  • From June 9, 1999, Impatiens Necrotic Spot on Pepper Transplants
    From: July 15, 1998, Phytophthora Blight on Tomatoes

    From: July 8, 1998. Angular Leaf Spot on Pumpkin,
    Buckeye Rot on Tomatoes (Phytophthora spp., including P. capsici),
    Phytophthora Blight of Cucurbits

    From June 25, 1998: Timber Rot on Tomatoes plus Hail Damage on Tomatoes and Sweet Corn.



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