In some cases, the curling leaves are not an indication of poor health or of poor growing conditions. Any ideas? Leaves curling and turning yellow: Curling and discoloration are often a common sign of poor plant nutrition (nutrient deficiencies) and pH problems. If your cucumbers leaves turning yellow you might have a problem. Roots become damaged and unable to absorb nutrients when the soil around it is too moist or submerged in water. 1 Response. There are many causes, requiring you to do a little detective work to correct the situation. A common example of this is the yellowing and shedding of many older leaves over a relatively short period in summer by holly hedges. In some cases, the curling leaves are not an indication of poor health or of poor growing conditions. The stunted growth may be due to over-fertilization, but cucumbers are generally heavy-feeders so unless you are fertilizing more than every two weeks, it's unlikely to be that. Viewed 3k times 2. The leaf number, leaf length and leaf width of transgenic and wild Arabidopsis plants were measured using 35-day-old seedlings; 15 plants of each genotype were analyzed. They are another insect that’s usually found on leaf undersides where they leave behind a silvery, fine webbing. There are many causes, requiring you to do a little detective work to correct the situation. Squash vine borers plague any type of melon or squash in the garden, including cucumbers. A viral disease, curly top also results in upward curling leaves. Pruned cucumber plants will have temporarily curled leaves as a way of conserving energy and as a reaction to the shock of being pruned. Pl advise what to do and possibly organic way. Add manure and compost to your garden soil before planting cucumber plants to ensure healthy soil for your cucumbers before they begin setting fruit. They look stressed. Do you know what could be wrong? Leaves curl outward due to many diseases. To help you have a bountiful harvest, we’ll enumerate some of the most common reasons behind these issues, along with their respective treatment and precautions. Cucumber Mosaic Virus. Three of the most common diseases that infect cucumber plants are: Cucumber Mosaic Virus: This disease is characterized by wrinkled, dried leaves with yellow spots. The leaves are usually lost gradually throughout the year, but some evergreens will occasionally shed a large number of old leaves at one time, and this can cause concern. However, in other cases, curling leaves are one of the earliest signs of stress on the cucumber plant. Yellowing of cucumber leaves. Ask Question Asked 2 years, 4 months ago. Don’t panic – this happens to the best of us! Seedlings do best with some fertilization for best development. Cucumber leaves can curl for a variety of reasons. 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