Q. Charcoal Rot. 6 years ago. Use as directed on the label. https://www.thespruce.com/houseplants-leaves-turning-brown-1902675 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. Adults are about 5/8-inch long, grayish or yellowish brown, flat backed and speckled. Treat light infestations with diazinon or Kelthane. I have 4 on the vines. Charcoal rot causes yellow leaves and an oozing, gummy substance at the stem. 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? 0 0. Iâm Ann. They have brown spots with a yellow halo, which quickly turn to larger irregularly shaped brown patches. The fruit seems to not be directly affected. We have had an abundance of rain here. One is getting bigger. Hi. My leaves are turning brown. Mastaneh. Itâs spread by bugs, so keep them away. The little cantaloupes are small and hard. Check the underside of the leaves for small red mites. It affects the older leaves first, eventually turning them yellow and dying. My cantaloupe leaves are affected by something, and despite my own research, I am still not sure what it is. Control: Trap adults beneath boards in spring--turn over boards in morning and kill bugs. Anthracnose causes pink spores to form on cantaloupe leaves. The plants are probably infested with spider mites. I started growing what I thought was squash, but turns out itâs cantaloupe. Anthracnose. Iâm a first time patio gardener. Description: Leaves with small specks which turn yellow, then brown. Vines wilt from point of attack to end of vine. Small grey to brown spots will appear on older leaves of watermelon plants. Melon flowers can turn brown and drop for several reasons: (1) if the flower is not visited by a pollinator then it will eventually brown and drop; (2) too much nitrogen in the soil can cause flowers to die and drop; (3) too much water or not enough can cause flower drop; (4) ⦠Remove and destroy heavily infested plants. Rotate your crops and use disease-free seed. My cantaloupe leaves have a web all over them and some of the leaves are turning yellow and dying. Bacterial wilt will cause leaves and stems to turn dark green and then wilt. https://growinginthegarden.com/how-to-prevent-and-treat-powdery-mildew The cantaloupes will turn tan and fall off vine when ready for eating. 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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