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United States Department of Agriculture

Agricultural Research Service

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Research Project: INCREASING FRUIT RETENTION AND OVERCOMING LEAF SCORCH AND SCAB OF PECAN TREES

Location: Fruit and Nut Research

Project Number: 6042-21220-011-06
Project Type: Nonfunded Cooperative Agreement

Start Date: Jun 09, 2008
End Date: May 30, 2013

Objective:
This collaboration seeks to address alternate bearing associated crop losses by evaluating efficacy of two orchard management strategies for improving commercial-scale pecan production. These include increasing fruit-set of pecan trees and reducing crop loss and alternate bearing caused by leaf scorch.

Approach:
A registered growth regulator (ReTain) is used in a ‘Desirable’ orchard to prevent excessive fruit-drop. Systemic acquired resistance inducers and micronutrients are used in a ‘Cape Fear’ orchard to overcome canopy and yield loss to leaf scorch and scab. The fruit retention study will use 'Desirable' trees sprayed post-pollination to retain fruit that otherwise drop during the June-drop phase of fruit development. Treatments will be untreated and treated (ReTain). The growth regulator is provided at no charge by Valent BioScience, Memphis, TN. Treatments will be replicated a minimum of 6 times, in large block rows, with yield and quality being assessed in the autumn for treatment effects. Return bloom will be assessed the following spring. The second study will evaluate several treatments (SAR inducers, micronutrients, and combinations) applied to single trees, involving about 50 trees. The study might need to be repeated for an additional one or two years.

Last Modified: 10/22/2014
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