Frequent low rate application of 2, 4-D and cytokinin to study plant symptom reduction in HLB affected trees � grower tests

Frequent low rate application of 2, 4-D and cytokinin to study plant symptom reduction in HLB affected trees � grower tests

Report Date: 05/23/2016
Project: 776   Year: 2016
Category: ACP Vector
Author: L. Gene Albrigo
Sponsor: Citrus Research and Development Foundation

Valencia harvests were completed and fruit/tree, fruit drop and leaf drop data collected. Juice analyses data is being analyzed. Fruit drop data was 22 % and 19 %, respectively, for Hamlin and Valencia trials at Babson Park. Drop % were 22 % and 20 % at Sebring and 18 % and 15 % at Ft. Meade, respectively, for Hamlins and Valencias. No differences were found between the low concentration PGR treatments and Controls at any of the sites for either healthier or more declined trees. The reduced fruit drop in treated trees after the first year did not occur in the second year. Leaf drop was heavier in September than later in the fall or winter for Hamlin trees and leaf loss was heavier for Valencias in December than later in the winter or spring. No differences were found between PGR-treated and Control trees in the amopunt of leaf drop. At each site there was no difference in the fruit per tree between the Control and PGR treatments in the second year after one year of treatments.


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