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Evaluation of Phosphonate Treatments for Control of Phytophthora Crown Rot of Walnut

G. T. Browne, T. L. Prichard, L. S. Schmidt, and W. H. Krueger

June 2011


Preventive foliar and soil (chemigation) applications of phosphonate were evaluated in a factorial manner for control of cankers caused by Phytophthora citricola in a Persian walnut orchard, cultivar Chandler. A foliar treatment was applied once in the second week of September, and a soil chemigation treatment was applied three times at weekly intervals from the last week of August to the second week of September; the treatments were applied separately and in combination to the walnut trees. At 1 and at 7 months after completion of the treatments, the trees were wound inoculated with P. citricola. Treatment efficacy was assessed by measuring the area of resulting trunk cankers.


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