Volume 30 Number 2 Article 1 Pages: 42-55
Year 1976 Month 4
Title: Fire Blight in the Geneva Apple Collection
Authors: H.S. Aldwinckle, R.D. Way, K.G. Livermore, J.L. Preczewski and S.V. Beer
Citation
Abstract:
Ratings of the severity of fire blight
(caused by Erwinia amylovora) were
made on trees in the apple collection
at the Geneva Experiment Station
after severe epiphytotics in 1972 and
1974. The most severe rating for each
cultivar, sport or numbered selection
is reported on a total of 1224 clones
on many of which fire blight has not
been reported previously.
Based on natural infections, several
authors (3, 4, 5, 6) have reported
ratings of the susceptibility of many
apple cultivars to Erwinia amylovora
(Burrill) Winslow et al., the incitant
of fire blight.
Often the data were
from 1-3 trees in one location (3,4,5).
Aldwinckle (2) derived ratings based
on a transcontinental survey of research
and extension workers using
many man-years of observations.
However,
only cultivars in substantial commercial
production in the United
States and Canada were listed (1).
Shaw (5) reported the susceptibility
of vegetative shoots of 25 apple cultivars
to artificial inoculation in the
greenhouse.
These studies did not include
cultivars and sports which were
locally unavailable or were only recently
produced.
This report summarizes observations
of infections on 1224 cultivars,
sports, numbered selections and Malus
species.
It does not, however, purport
to unequivocally rate fire blight
susceptibility.
Fire blight has not prevously
been reported on some of the
clones observed.
Many of the apples
listed are presently unimportant commercially;
some are unknown in North
America but are important in other
apple-growing regions.
Full text download: APS subscribers
ISHS members & pay-per-view
Download all articles in volume 30 number 2 (for APS subscribers only) (all PDF's in .tar archive format)
(PDF 1346949 bytes)
Translate:
APS membership administration
ISHS membership administration
