Geographical origin of pecan cultivars influences time required for fruit development and nut size.
Sparks D.
The limitations imposed on the time required for fruit development and on nut size by the geographic origin of a cultivar were analyzed for 46 cultivars of pecan [Carya illinoensis (Wangenh.) C. Koch]. Two very different ecotypes were found to exist: cultivars adapted to a growing season of approximately 160 to 180 days and those adapted to approximately 210 or more days. Days required for fruit development ranged from 137 to 198 among cultivars. A substantial genetic base for early nut maturity exists in pecan. Nut weight and, to a limited degree, percentage kernel increased linearly with time required for fruit development. Early nut maturity is apparently associated with small nut size, and incorporation of earliness into a cultivar appears to be at the expense of nut size.
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