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When GA 3  foliar sprays are applied to tomatoes at transplanting (7.5 ppm, twice, one week apart) the lowest main stem clusters bear fruits which have large blossom-end scars (catfacing). Later flowering clusters are less affected as long as the plants are being grown under normal temperature conditions. Preliminary trials (Wien and Zhang, Hort Sci. 26:583-585, 1991) indicated that cultivar differences in catfacing susceptibility were reflected in GA 3 -induced catfacing differences. In 1990 and 1991, field trials were conducted in Freeville, N.Y. to compare the catfacing susceptibility of 14 and 18 fresh tomato cultivars respectively, using GA 3  treatment. Catfacing was measured by counting the percentage of fruit on the third main stem, primary branch and two basal clusters that had blossom scars longer than 1 cm. Of the 14 cultivars common to both seasons, Valerie, Sunrise and Basketvee were least affected by catfacing in both control and GA 3 -treated plots, and Starfire, New Yorker and Olympic were most catfaced. GA 3  spray shows promise for selecting catfacing-susceptible tomato cultivars.

SCREENING FRESH-MARKET TOMATO CULTIVARS FOR CATFACING SUSCEPTIBILITY WITH GA3 SPRAYS.