Volume 48 Number 1 Article 25 Pages: 51-51
Year 1994 Month 1
Title: Impact of Disease Resistant Apple Cultivars on Fungicide Use in Ohio
Authors: M.A. Ellis, D.C. Ferree and R.C. Funt
Citation
Abstract:
The impact of disease resistant apple cultivars and inorganic fundicides (copper and sulfur) on current fungicide usage patterns are being studied.
The efficacy of "organic" and conventional fungicide spray programs was evaluated on an apple scab immune ('Liberty') and a scab susceptible ('McIntosh') and apple cultivar in a randomized, replicated trial at Wooster, Ohio.
Trees of both cultivars were nontreated, treated with inorganic "organic" fungicides only, or treated with conventional fungicides. 'McIntosh' trees received full season fungicide applications and 'Liberty' trees were sprayed only during the summer cover sprays (after petal fall) for control of summer diseases only.
Emphasis was placed on evaluating the efficacy of disease resistance for full season disease control alone and in combination with various fungicide programs.
Diseases of primary interest were apple scab, sooty blotch, fly speck and black rot.
In 1991, the number of fungicide applications ranged from 0 for nontreated 'Liberty' to 12 for the full schedule "organic" treatment on 'McIntosh,' with both treatments providing excellent disease control.
All nontreated 'McIntosh' fruit were scab infected and very poor quality.
Due to a dry growing season and lack of summer disease development, nontreated 'Liberty' fruit had excellent quality.
In 1992, the number of funicide applications ranged from 0 for nontreated 'Liberty' to 14 for the full schedule "organic" treatment, with both treatments providing good to excellent disease control.
An economic analysis of the programs is currently being conducted.
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