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`Haralson,' the most widely-grown cultivar in Minnesota, is highly susceptible to russetting and cracking in many orchards. Because wax platelet arrangement has been proposed as a cause for russettting in `Golden Delicious' apples, we examined the wax platelet arrangement of `Haralson' apples. When compared to the wax platelet arrangement found on the russet-susceptible `Golden Delicious,' and on `McIntosh,' a cultivar which does not russet in our region, `Haralson' platelets were large and upright in orientation, more numerous than found on `Golden Delicious,' but unlike the smaller, more granular platelets found on `McIntosh.' In a concurrent study, we made four GA,,, (Provide) applications, at petal fall and at p.f. +10, 20, and 30 days. At harvest, the treated and untreated blocks of trees were examined for incidence of russet, 25-ct. wt., and total yield per tree. Treated trees produced a greater number of fruit of slightly larger size and with reduced incidence of russet than untreated trees in the study.

292 WAX PLATELET ARRANGEMENT, GA4+7 APPLICATIONS, AND THEIR RELATIONSHIPS TO RUSSET IN `HARALSON' APPLES