Symptoms do not occur on the leaf underside. Silverleaf symptoms have been observed on very young plants with only three true leaves, on plants in later vegetative stages, and on plants during fruit production. All or some leaves on a plant may be affected. In severe cases, plants are stunted and fruit production is restricted. The disorder may appear on plants scattered through a field, on plants on one side of a field, or on all of the plants in a field.
Some observations suggest that symptoms disappear occasionally, and plants resume normal growth.
However, silvering is permanent in any given leaf in which it occurs, but it is developmentally reversible. Normal plants can develop new silvered growth and plants having silver leaves can develop new green growth. Fruit symptoms are not noticeable in cases of mild leaf silvering, however, when leaf silvering is severe, fruit color is lighter than normal. Yield reductions and poor fruit quality are usually associated with leaf silvering. History Silverleaf of squash was first observed in Israel in 1963.