Virus
Squash mosaic, cucumber mosaic, watermelon mosaic

• Irregular, blotchy to wavy patterns of yellows and greens on leaves
• Leaves may be distorted (sometimes fern-like), wrinkled, and curled
• Plants may be stunted
• Fruit may have unusual color patterns, blotches or rings but are not rotten
• Fruit are often deformed and distorted
• More information on Virus