Effects of Fruiting on Scorch, Premature Defoliation, and Nutrient Status of ‘Chickasaw’ Pecan Leaves1

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Abstract
The effect of retaining fruit on the induction of scorch, defoliation, and nutrient status of pecan [Carya illinoensis (Wang) K. Koch] leaves was compared with the effect of fruit removal. Fruit retention induced leaf scorch and defoliation. Fruiting suppressed N, P, and Zn accumulation in leaves and resulted in a net loss of K from leaves. Potassium loss from leaves was associated with a high K content in the shuck. The data suggest that heavy fruiting in pecans can induce a K stress which in severe cases results in leaf scorch and defoliation.

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