Volume 48 Number 1 Article 20 Pages: 46-47
Year 1994 Month 1
Title: Using Disease-Resistant Apple Cultivars to Reduce Fungicide Applications for Disease Control
Author: W. Hal Shaffer
Citation
Abstract:
Most disease-resistant apple cultivars
(DRAC) are resistant to apple scab;
some are resistant to other diseases.
However, many of these cultivars are
susceptible to other diseases includ
ing cedar apple rust, powdery mildew, fireblight, fly speck, and sooty
blotch.
The objective of this research
was to determine to what extent
DRAC could be used to reduce fungi
cide applications for disease control.
During 1983, a replicated planting of standard cultivars and DRAC was es
tablished at the Univ. of Missouri's
Horticulture Research Center in New
Franklin, MO. Standard varieties in
cluded: 'Jonathan,' 'Red Delicious,' and
'Golden Delicious'; DRAC included:
'Prima,' 'Priscilla,' 'Sir Prize,' 'Redfree,'
'Jonafree,' 'Dayton,' 'Williams Pride,'
'Liberty,' and four numbered selections
from the Purdue-Rutgers-Dlinois breed
ing program.
Fungicide applications
for control of diseases were reduced by an average of 64$ using the DRAC
'Liberty,' 'Priscilla,' and 'Redfree,' compared to the standard varieties Jonathan,'
'Red Delicious,' and 'Golden
Delicious' during a two-year test pe
riod from 1987-1988. An average 45%
reduction in fungicide applications also was obtained during the same
period on the scab-immune variety
'Prima' which is very susceptible to
cedar-apple rust.
DRAC offer fruit
growers an opportunity to reduce
production costs while protecting the
environment.
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