One is getting bigger. 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) … Adults are about 5/8-inch long, grayish or yellowish brown, flat backed and speckled. 0 0. Rotate your crops and use disease-free seed. Anthracnose. Q. Mastaneh. My cantaloupe leaves have a web all over them and some of the leaves are turning yellow and dying. 6 years ago. A. I’m Ann. https://growinginthegarden.com/how-to-prevent-and-treat-powdery-mildew We have had an abundance of rain here. Small grey to brown spots will appear on older leaves of watermelon plants. Treat light infestations with diazinon or Kelthane. The fruit seems to not be directly affected. My cantaloupe leaves are affected by something, and despite my own research, I am still not sure what it is. Description: Leaves with small specks which turn yellow, then brown. I started growing what I thought was squash, but turns out it’s cantaloupe. The plants are probably infested with spider mites. Charcoal rot causes yellow leaves and an oozing, gummy substance at the stem. I have 4 on the vines. Vines wilt from point of attack to end of vine. The little cantaloupes are small and hard. My leaves are turning brown. Use as directed on the label. https://www.thespruce.com/houseplants-leaves-turning-brown-1902675 Hi. They have brown spots with a yellow halo, which quickly turn to larger irregularly shaped brown patches. The cantaloupes will turn tan and fall off vine when ready for eating. Control: Trap adults beneath boards in spring--turn over boards in morning and kill bugs. 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. Charcoal Rot. Handpick adults, egg mass and young bugs on plants. Check the underside of the leaves for small red mites. Remove and destroy heavily infested plants. 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? Typically, brown leaves on watermelon plants will appear more as brown spots or areas of brown. I’m a first time patio gardener. 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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