The Hood River glacier. (Hood River, Or.) 1889-1933, 1912-10-03
ANTHRACNOSE DAN
GEROUS TREE DISEASE

While a majority Of the apple grow l
ers are familiar with Anthrscuose ;.a- d.u
It's control, it is evident lnae eisnei .ne.
through lack of information " mss
lect, this disease has spreau 10 SUM re-. u
the orchards, causing serious ana iasl-
ing damage to the trees. Weatner CON
ditions have been ideal for the develop
ment of the disease this season ana an
epidemic is ant to occur this coming
autumn. Should such epidemic occur
hundreds Of bearing as well as young
trees may be rendered very weak since
the fungus causing the disease attachs
the body of the tree directly lhreateh,
ing ITS destruction. Badiy uamaged
trees do not recover for two TO several
years after the disease mas run its
course.
Owing to the destructive nature OF
Anthracnose ard the rapldlty win
which II spreads, and especially upon
very young trees, great precautions
should be taken to locate and treat,
very thoroughly, every specimen that
show one or more cankers. Inc di-
sease can be eliminated by thorough
spraying and the plan Of coating every
tree on the ranch, TO protect the
healthy ones and prevent future at
tacks, is the method that will give the
results.
Recent investigations show that An
thraenose fungus causes rot OF apples
10 storage. At the time of picking
there is no indication of defects in
fruits. 1t is apparent that the spores
OF the fungus which are discharged
from the cankers during the summer
and later lodge upon the fruit, adhere
to 1t, later terminating and causing
decay of the fruit after the same has
been in storage for several weeks or
months.
In combating the disease two kinds
of spray may be used Bordeaux mix
ture is recognized as the more effective
and is recommended in all cases where
scale or other insect pest do not occur.
Spraying during the fall with either
llme-sulphur or bordeax mixture before
the fruit has been gathered evidently
does not injure the fruit and prevents
attacks of anthracnose and other fungi
TO large degree at least. Strong
mixtures leave a residue on the fruit
that interferes in the coloiing of red
varieties and for this reason 1T is gen.
orally more desirable to apply the
weaker sprays. If Bordeaux mixture
is applied ALSO strength should be
used before the fruit is gathered, while
1-4-5O is better for applications made
following the picking of the fruit.
Spraying before the fall rains begin is
very essential since the disease not
only attacks the tree Immediately
but the conditions for
spraying of any kind soon become very
The same recommended
ions hold true relative to the use of
lme-sulphur summer strength to be
lsed previous to picking, while the
winter strength should follow picking
md especially where insect pests or
mites are present.
During most seasons the time be-
ween the last picking of the fruit and
he beginning of the fall rains is so
hort that it is impossible to do the
praying as suggested. In sections
where the rains duringsthe summer are
ight, spraying during early spring and
efore the buds begin to swell is some
ines practiced This method has
.iven perfect results and is advisable
,here fall spraying cannot be done.
or the spring spraying bordeaux Cd
0 should be used unless the trees are
$50 infested with scale, in which case
winter strength may be
W. II. Lawrence, pathologist.