![]() The most likely diseases to affect cucumbers are: Mosaic Virus How to Identify Diseased Cucumber PlantsĪ number of diseases can also cause cucumber leaves to yellow. If you’re growing under artificial lights, you’ll need between twelve and sixteen hours as grow lights aren’t nearly as powerful as the sun. ![]() If you are growing your cucumbers in pots, moving your plants to a brighter location may be an option. They need a minimum of six hours of direct sunlight per day. How Many Hours of Sunlight Does Your Cucumber Get?Ĭucumbers are sun worshippers. Ideally, a cucumber plant should receive one to two inches of water per week. The soil should be moist, but not waterlogged. To test moisture, stick your finger into the soil up to the first knuckle. Too little water and they’ll quickly crisp up and die. When cucumbers receive too much water, leaves will yellow, become limp, and may fall off. When it comes to watering, cucumbers are a bit like Goldilocks. Aphid colonies can be quite significant, making them easy to spot. ![]() Aphids, potato leafhoppers, spider mites, and whiteflies are all common pests that do this.Ī visual inspection will often reveal if these insects are the source of your problem. Pests that suck the sap from the leaf can cause leaves to yellow. Be sure to check the bottoms of leaves, especially those that are curling. So how do you figure out what is causing the problem? A Diagnosis Guide for Cucumber Leaves That Are Turning Yellow Ultimately, a cucumber plant with yellow leaves is stressed and needs attention. Because the plant’s ability to photosynthesize is affected, it struggles to produce enough sugar to feed itself. Chlorosis occurs when chlorophyll, an essential ingredient for photosynthesis, is in short supply. “Chlorosis” is the technical term for what’s happening.
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