The cantaloupes will turn tan and fall off vine when ready for eating. https://growinginthegarden.com/how-to-prevent-and-treat-powdery-mildew Q. 6 years ago. Bacterial wilt will cause leaves and stems to turn dark green and then wilt. Anthracnose causes pink spores to form on cantaloupe leaves. Remove and destroy heavily infested plants. Description: Leaves with small specks which turn yellow, then brown. Typically, brown leaves on watermelon plants will appear more as brown spots or areas of brown. The fruit seems to not be directly affected. Treat light infestations with diazinon or Kelthane. Small grey to brown spots will appear on older leaves of watermelon plants. We have had an abundance of rain here. One is getting bigger. I started growing what I thought was squash, but turns out it’s cantaloupe. My cantaloupe leaves are affected by something, and despite my own research, I am still not sure what it is. Mastaneh. I’m a first time patio gardener. The little cantaloupes are small and hard. Anthracnose. Check the underside of the leaves for small red mites. Use as directed on the label. Control: Trap adults beneath boards in spring--turn over boards in morning and kill bugs. They have brown spots with a yellow halo, which quickly turn to larger irregularly shaped brown patches. My cantaloupe leaves have a web all over them and some of the leaves are turning yellow and dying. I have 4 on the vines. https://www.thespruce.com/houseplants-leaves-turning-brown-1902675 0 0. Two possible diseases: (1) late blight: small, round yellow spots on leaves turn almost black in 2 weeks; spray with a copper-based fungicide every 7 to 10 days; (2) black heart: water-soaked areas on leaves turn brown and then black; add calcium to the soil; check the soil pH for imbalance; spray with kelp or seaweed extract. I live in Las Vegas and some of my cantaloupe and watermelon are getting soft and yellow and they dye leaves are green and not yellow only the fruits are dying can you please tell me why? Hi. Rotate your crops and use disease-free seed. I’m Ann. It’s spread by bugs, so keep them away. My leaves are turning brown. Charcoal Rot. Vines wilt from point of attack to end of vine. Charcoal rot causes yellow leaves and an oozing, gummy substance at the stem. Handpick adults, egg mass and young bugs on plants. The plants are probably infested with spider mites. A. Often times, these spots are accompanied by a light green-to-yellow water-soaked ring around the spot, sort of like a halo. 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