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Effect of Calcium in Offsetting Defoliation Induced by Ethephon in Pecan1


A greenhouse screening system was developed with ‘Curtis’ seedlings of ‘Curtis’ pecan (Carya illinoensis (Wang) K. Koch) to test the effect of Ca in reducing defoliation caused by foliar applications of (2-chloroethyl)- phosphonic acid (ethephon). Ethephon alone at 2000 ppm induced 100% abscission, but the effect could be offset with 0.01 M Ca from several sources. The added Ca increased the freely available Ca in treated leaves. As pH of the solutions containing ethephon alone increased from 2.0 to 8.0, less defoliation occurred.