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Cucumber seedlings turning white9/28/2023 Once the Alternaria fungus infects plants, it needs to be treated with a fungicide application. If you have a period of sustained rain, expect cucumbers to be more susceptible to Alternaria leaf spot. The infection becomes prevalent when the leaves are left wet for over ten hours. Planting bush varieties too early can leave the leaves in contact with moist soil for too long. Whilst cucumbers are considered among the best vegetables to plant in spring, that only applies to vining varieties. ![]() Longer periods of morning dew and night temperatures over 60-Fahrenheit are when cucumbers are at the highest risk. High humidity and warm climates are when the Alternaria cucumerina fungus spreads fastest. When this becomes more prevalent is in mid-summer when night temperatures are higher. The lesions are the largest battle on mature leaves. On new leaf growth, the initial signs of spread are brown leaf tips. As the disease matures though, those spots enlarge and can reach a half-inch per spot.Īs the disease spreads and spots enlarge, it can cause all aged leaves to brown resulting in defoliation. The symptoms start as small brown spots on mature leaves, usually with a yellow halo (ring) around the edge.Īt first, the spots are only one to two millimeters in diameter. On other cucurbits, such as cantaloupe and watermelon, it can spread to the fruit, but with cucumber plants, it only affects the leaves. Bacterial leaf spot starts as small brown spots on the underside of leaves.Īngular leaf spot disease causes light tan brown spots between the leaf veins.Īlternaria leaf spot is a fungal foliage disease on cucumber plants. ![]() Anthracnose causes brown spots that drop leaving holes in the leaf. ![]() Frequently Asked Questions about brown spots on cucumber leavesĪlternaria infections cause brown spots that spread across cucumber leaves.
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