OBSERVATIONS OF GROWTH, SCAB CONTROL AND PHYTOTOXICITY FROM PHOSPHITE ON NON-BEARING TREES
Applied Research
Raymond Joyce
County Extension Agent
University of Georgia
Dublin
Abstract
Phosphites are a reduced form of phosphate. In pecan production,phosphitesare used as a fungicide and are very effective at controlling pecan leaf scab. With the greatest effect of scab on bearing trees,non-bearing trees do not need strict fungicide programs. In recent years,phosphiteswere researched for additional nutrient benefits. As a nutrient, phosphite is not available to the plant with its conversionin the soil found to be too slow to be agriculturally relevant (Thao et al, 2009). Phosphites were found to suppress the developmental response of plants with P deficiency as well as mimic P in some plantswith P deficiency (Thao et al., 2008). In addition to nutritional benefits, this study was conducted to see if phosphite use translated into a horticultural benefit for non-bearing pecan trees. Four treatments of differing rates and intervals of K-Phitewere replicated four times on no-bearing pecans. Height and caliper growth were compared as well as leaf nutrient samples compared.
Poster has NOT been presented at any previous NACAA AM/PIC
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Authors: J. R. Joyce, A. G. Sawyer, M. L. Well
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Joyce, J. County Extension Agent, University of Georgia, Georgia, 31021
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Sawyer, A. Area Extension Agent, University of Georgia, Georgia, 30460
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Well, M. Extension Specialist, University of Georgia, Georgia, 31794