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The P&PDL Picture of the Week
for 6 October 2003



Mini-pumpkin virus

Gail Ruhl, Senior Plant Disease Diagnostician, Interim P&PDL Director

Did you know that not all of the colorful mosaic patterns and interesting lumps and bumps on decorative gourds, mini pumpkins and squash are the result of genetics and plant breeding? Mosaic virus diseases of vine crops may also cause similar symptoms.

Access additional information on mosaic virus diseases at the following web sites:
http://vegetablemdonline.ppath.cornell.edu/PhotoPages/Cucurbit/CucViruses/CucVirPhotoList.htm

Mosaic Virus Diseases of Vine Crops
http://ohioline.osu.edu/hyg-fact/3000/3109.html

Access additional general information on squash, pumpkins and gourds at:
http://www.hort.purdue.edu/rhodcv/hort410/squash/squash.htm

Color mottling on 'Munchkin' mini-pumpkin following infection with Watermelon Mosaic Potyvirus (WMV)

Photo courtesy of Tom Zitter, Extension Vegetable Pathologist, Cornell University


Fusarium Rot of Pumpkin

Karen Rane, Plant Disease Diagnostician, Botany & Plant Pathology, Purdue University

Several species of the plant pathogenic fungus Fusarium can cause spots and rot of pumpkin fruit. Symptoms range from small, pitted, corky spots to large, sunken areas covered with a white or gray mold (Figure 1). Fusarium species are common soil inhabitants, but the conditions that induce fruit rot symptoms are unknown. Fungicide applications are not effective in controlling this disease. Recent work at the Ohio State University by Dr. Max Reidel and his student Andy Wyenandt indicates that planting pumpkins into a cover crop may help to reduce the incidence of Fusarium rot, by keeping the fruit from coming in contact with the soil. For more information on this research, see the Ohioline newsletter article at the following website:
http://fusion.ag.ohio-state.edu/news/story.asp?storyid=986

Lesions on pumpkin fruit caused by a Fusarium species

 

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Last updated: 6 October 2003/amd
The Plant & Pest Diagnostic Laboratory at Purdue University