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  • Author or Editor: Daniel B. Meador x
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Abstract

Foliage sprays of silicon dioxide formulation (Apasil) applied at petal fall and at 7- and 14-day intervals following petal fall in 1975 and at petal fall and 7 days later in 1976 significantly reduced russet on fruit of spur-type ‘Golden Delicious’ apple (Malus domestica Borkh.).

Open Access

Abstract

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. Chemical names used: (1α,2β,4aα,4bβ,10β)-2,4a,7-trihydroxy-1-methyl-8-methylenegibb-3-ene-1,10-dicarboxylic acid 1,4a-lactone (GA4+7); polyoxyethylene-polypropoxypropanol dihydroxypropane (Regulaid).

Open Access

Abstract

Providing home horticulture information for the 14,000,000 citizens of Illinois is a formidable task which requires effective use of available resources, innovation, and cooperation. One innovation utilized by University of Illinois Extension horticultural specialists is tele-lectures delivered via a TeleNet system.

Open Access