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United States Department of Agriculture

Agricultural Research Service


item Wood, Bruce

Submitted to: Pecan Grower
Publication Type: Trade Journal
Publication Acceptance Date: 1/11/2003
Publication Date: 2/15/2003
Citation: WOOD, B.W. VIVIPARY. PECAN GROWER. 2003. v.14(3). p.6-7.

Interpretive Summary: Vivipary, or premature sprouting, of pecan nuts causes substantial economic loss in certain orchards. Orchard management strategies need to be revised and developed to protect against vivipary. Several factors are identified that act to either increase or decrease vivipary. Consideration of these principles by orchard managers will allow for development of strategies that will substantially reduce the loss of nut production and quality by vivipary.

Technical Abstract: At the present time the practical approach to avoiding vivipary in existing orchards entails adoption of some combination of the following approaches: a) ensure that soil moisture levels are near field capacity during the kernel filling stage (i.e., usually September and October for most cultivars and locations in the U.S.; it should be noted that water-logged soils can actually induce vivipary); b) take advantage of the early-ripening effect of Temik usage; c) avoid excessive crop loads by either timely mechanically thinning excess fruit or by indirect thinning via hedge pruning; and d) early harvesting. Research efforts at the USDA-ARS Southeastern Fruit and Tree Nut Research Laboratory have investigated vivipary for several years and continue to look for additional strategies and tools that growers can use to eliminate vivipary.

Last Modified: 10/17/2017
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