Physiological leafroll occurs when the edges of the leaves roll upward and inward. Sometimes the curling continues until the leaf margins from either side touch or overlap. Some leaves on the plant may not exhibit rolling. Leafroll does not reduce plant growth, yield, or fruit quality.
It is believed to result from irregular water supply, and may be intensified following pruning. The symptoms are sometimes temporary, disappearing after a few days, but can persist throughout the growing season.
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