The leaves are thin and pale green, with elongated tips and an overall longer shape. They are uneven in size and slightly curved, resembling a scooped-out shape. The petioles are long and droop downward, while the leaf texture is crisp or shows longitudinal cracks that make them prone to breaking. This condition is typically caused by excessively high temperatures and overly moist soil. To address this, it's important to lower the temperature and reduce humidity.
The leaves are large and appear swollen, with curled edges and thin, pale veins. This symptom often occurs when the temperature is too low and the soil is excessively warm. Adjusting the environmental conditions to balance the temperature can help alleviate this issue.
The leaves are large, but their color is yellow-green and dull. Occasionally, there may be a yellowish ring around the leaf edges, and both the leaf tips and stems fail to grow properly. This is usually due to high temperatures and dry soil. Cooling the environment and watering the plant promptly will help restore its health.
The upper leaves are small, with curled margins that resemble an umbrella shape. The growing tip does not expand, and the leaves remain dark green. This is often a result of over-fertilization. It’s essential to adjust the fertilizer application and ensure it's used appropriately.
In the morning, the edges of cucumber leaves feel hot and show water-soaked, angular or round spots that disappear after sunrise. This is caused by high greenhouse temperatures that inhibit transpiration. Lowering the temperature can prevent further damage.
Leaf veins are surrounded by sheet-like, waterlogged scars that become soft and turn gray-green over time. This issue commonly appears in greenhouses where large amounts of uncomposted organic fertilizer have been used. It's a sign of ammonia toxicity, so proper ventilation is crucial, and unfermented organic fertilizers should be avoided.
To maintain healthy growth, it's important to monitor temperature, humidity, and soil moisture levels regularly. Proper care and adjustments in the growing environment can significantly improve plant health and productivity. Always ensure good air circulation and avoid overuse of fertilizers to prevent such issues.
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