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Effect of early season foliar sprays of ga 4+ 7 on russeting and return bloom of golden delicious apple

Effect of early season foliar sprays of ga 4+ 7 on russeting and return bloom of golden delicious apple

Hortscience 22(3): 412-415

Early season multiple spray applications of 5, 10, or 20 ppm of gibberellins A4 + 7 (GA4 + 7) reduced the severity and frequency of russet on four strains of 'Golden Delicious' apple (Malus domestica Borkh) fruit at three locations over 1, 2, or 3 years. The distribution of fruit in the U.S. extra fancy and fancy categories (graded for russet only) increased with increasing concentration of GA4 + 7 sprays. Regression analysis of data pooled from seven trials predicted for the 5-, 10-, and 20-ppm GA4 + 7 sprays, respectively, 68%, 74%, and 76% of the fruit falling in the combined extra fancy and fancy grades as compared to 40% on the untreated control trees. Additional experiments revealed tank-mixing GA4 + 7 with pesticides reduced the degree of russet suppression in one trial, but not in another. Return bloom was diminished on trees sprayed with GA4 + 7 in the previous year and the flower cluster density was inversely related to GA4 + 7 concentration.

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Accession: 005235310

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