‘ Spraying Apple Trees. 23
Oi]? the setting of the fruit entirely. Both show, however, that spraying
gm i to be effective must be done immediately after the blossoms fall.
at If delayed the larvae get down into the fruit where no spraying
lm will reach them. ·
. From my own tests I am disposed to recommend strong mixtures
mg ‘ of arsenate of lead in preference to Paris green mixtures, though
the I know from previous experimentation that the latter can be made
Ind _ to do very effective work. i
-0},- We used last spring a mixture of arsenate of lead containing
mc-   pounds in fifty gallons of water, and found it very effective.
mss »i A somewhat weaker mixture, say 3 pounds in fifty gallons of water,
mu will probably do ljust as well, and where large orchards are to be
and sprayed is preferable on the score of economy. Yet it must be
the remembered that arsenate of lead is not effective when employed
Mh in water in the same proportions as Paris green. A mixture of the
L latter poison in the proportion of 1 pound in 150 gallons of water
imp is about all the foliage will endure, because the poison in Paris
ww green is slightly soluble and stronger mixtures are likely to burn
USGS foliage. To prevent burning when using Paris green, a few pounds
mb, of lime are commonly added-
mcil 'l`he precise procedure in spraying an orchard depends somewhat
Sm] on what pests are present in it. If only eodling moth is trouble-
HWS sonic. the early spraying with arsenate of lead or Paris green, with
the an additional application of the same mixture in a week or ten days
can after the first. will commonly be all that the trees need. It will
mw S serve also for most of the other early-appearing. leaf-gnawing
insects. such as the canker worm and apple-leaf measuring worm.
But if hitter rot, brown rot. or seab, is prevalent. it is advisable to
use the arsenate of lead or Paris green in Bordeaux mixture, and
I more than two spraying may be required. since the rots often appear
Etify after the apples are well grown.
from ObS(‘l'\’llEiO1\S 011 the Life-history.
gched M _ _ _ _ _ A
made lhe importance ol; knowing the time limits of the broods and
HOME stages for Kentucky was impressed upon me in 1893, while engaged
fan, in \\`¢·>l'l{·Wlt`ll apple pests on the Experiment Farm, and it was de-
jgma ternnned then when opportunity offered to devote to the question
event time necessary to determine these points. Incidentally facts throw-