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:
Mosaic Virus Diseases of Vine Crops
Access additional general information on squash, pumpkins and gourds at:
Color mottling on 'Munchkin' mini-pumpkin following infection with Watermelon Mosaic Potyvirus (WMV)
Photo courtesy of Tom Zitter, Extension Vegetable Pathologist, Cornell University
Karen Rane, Plant Disease Diagnostician, Botany & Plant Pathology, Purdue University
Several species of the plant pathogenic fungus Fusarium can cause spots
rot of pumpkin fruit. Symptoms range from small, pitted, corky spots to
large, sunken areas covered with a white or gray mold (Figure 1).
species are common soil inhabitants, but the conditions that induce
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
Andy Wyenandt indicates that planting pumpkins into a cover crop may
reduce the incidence of Fusarium rot, by keeping the fruit
coming in contact with the soil. For more information on this research,
the Ohioline newsletter article at the following website:
Lesions on pumpkin fruit caused by a Fusarium species
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