Abstract
Abstract Effects of 0, 250, 500 and 750 ppm (2-chloroethyl)phosphonic acid (ethephon) on defoliation of ‘Robinson’, and ‘Nova’ tangerines (Citrus reticulata Blanco × (C paradisi × C reticulata), ‘Orlando’ tangelo (C. paradisi × C. reticulata) and ‘Owari’ satsuma trees (C. reticulata Blanco) were studied in 1974. Effects of 0, 250 and 400 ppm on defoliation, fruit plugging, yield, and color of ‘Robinson’ tangerines were studied in a second grove in 1974 and 1975. Old leaves were more subject to abscission from ethephon applications, whereas young leaves were relatively tolerant. Fruit yield was not reduced on ‘Robinson’ trees treated in the fall with up to 400 ppm ethephon. Fruit color, leaf drop, and fruit loosening were increased significantly by 250- and 400ppm ethephon.
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