The leaves are thin and greenish in color, with elongated tips and an overall longer shape. They appear uneven and slightly scooped, while the petioles are long and tend to droop. The texture is crisp or shows longitudinal cracks, making them prone to breaking. This condition is typically caused by high temperatures and excessive soil moisture. To address this, it's important to lower the temperature and reduce humidity.
The leaves are large, swollen, and their edges curl upward, while the veins appear thin and pale. This is often a result of low ambient temperatures combined with overly warm soil. Adjusting the temperature to a more balanced level can help improve the situation.
The leaves are large, with a yellow-green and dull appearance. Sometimes, a yellow-green ring appears around the leaf edges, and both the leaf tips and stems fail to grow properly. This is due to high temperatures and dry soil conditions. It’s essential to cool the environment and water the plants promptly.
The leaves are large, but the dark green foliage grows slowly. They tend to twist to one side, resembling symptoms of a viral infection. This issue usually arises from low temperatures and excessively dry soil. Warming the area and providing adequate water can help resolve the problem.
The upper leaves are small, with curled margins that resemble an umbrella shape. The growing points don’t expand, and the leaves remain dark green. This is often caused by overuse of fertilizers. It’s important to apply nutrients carefully and in appropriate amounts.
In the morning, the edges of cucumber leaves feel hot and show angular or round water-soaked spots that disappear after sunrise. This happens when greenhouse temperatures are too high, inhibiting normal leaf transpiration. Lowering the temperature can help prevent further damage.
Leaf veins are often surrounded by sheet-like scars, which become soft and turn gray-green over time. This condition is common in greenhouses where large amounts of uncomposted organic fertilizer have been used. It is known as "ammonia poisoning" in cucumbers. Proper ventilation is crucial, and unfermented organic materials should be avoided to prevent this issue.
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