A number of mosaic viruses infect cucurbits including cucumber mosaic, papaya ringspot, watermelon mosaic, zucchini yellow mosaic.
Identification
Infected leaves become mottled yellow/green and take on a puckered (drawstring) effect
If infected at an early growth stage, the plant will become stunted and malformed; it may also fail to produce fruit
Plants infected later in the season will produce mottled, misshapen fruit that often fail to ripen
Often Confused With
Nutrient Deficiencies
Mosaic and rugosity of foliage and color breaking on fruit of straightneck yellow squash caused by Watermelon Mosaic Potyvirus (formerly WMV-2).