INSECT AND FUNGOUS ENEMIES OF THE APPLE. i 
TREATMENT. 
Three methods of control are applicable against cankerworms, and 
where the insects have been quite injurious the use of all three 
methods in conjunction may be adopted. 
The wingless moths, and also the caterpillars, may be prevented to 
a large extent from reaching the foliage by the use of bands of sticky 
substances around the trunks of trees, some 12 to 18 inches from the 
ground. Some 
excellent prepara- 
tions for this pur- SIE 
pose are on the 
market, or home- 
made adhesives 
may be used. A 
simple plan is first 
to scrape off the 
rough bark from 
the trunk of the 
tree in a band 8 
to 10 inches high, 
and surround the 
tree at this place 
with a strip of 
stiff paper, tying 
tightly, so that no 
moth or larva can 
work up the trunk 
beneath it. The 
paper band should 
then be coated 
with a sticky ad- 
hesive, which 
should be replen- 
ished as often as 
necessary to keep 
it in good working 
condition. This method is especially suited to large trees in lawns 
around the home, or elsewhere, where plowing and spraying are 
considered impracticable. 
The larve are readily poisoned with arsenicals, as arsenate of lead 
and Paris green, used at usual strengths. The first treatment for 
apple scab, while a little late for cankerworms, will in most cases 
answer fairly well, and where the insect is troublesome an arsenical 
should be added, as for the bud moth. 
492 
“gy 
bs 
\E 3 
Fic. 10.—Work of the spring cankerworm (Paleacrita vernata) 
on apple. 
