Abstract
Abstract Defoliation of pecan trees [Carya illinoensis (Wang) K. Koch] in August reduced yield and nut size the current season. No nutlets were set the next season when trees were defoliated on September 15 or earlier. Nutlet set increased as defoliation date became later the previous fall through November 15. Yield was less than 1 kg/tree for trees defoliated the previous season on October 15, or earlier compared with 11 kg/tree for trees defoliated November 1. Early defoliation in the fall also caused late refoliation the next spring.
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