Q: The cucumber grows well. The middle leaves are normal. The middle and upper leaves are wilting, the roots are very good, and there is no root knot nematode. What is the cause of this? How to prevent it?
A: This is a physiological acute atrophy. When the temperature of the greenhouse is high and the light is strong, the upper and middle blades are large and thin, the transpiration is large, and the water loss is faster than the water absorption, and acute wilting occurs. Control measures: First, the high temperature and strong light stage at noon, appropriate shading. The second is the noon wilting period, the appropriate spray of water or foliar fertilizer in the shed. Tests have shown that proper application of vinegar or aspirin 1000 times can increase stress resistance and reduce acute wilting.
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