MISSOURI BOTANICAL GARDEN BULLETIN 
tion of nicotine sulphate. 
23 
These are twisted in a funnel 
shape and ignited, producing a thick, suffocating smoke. 
Occasionally, substances like lime, tobacco dust, naphtha- 
line, etc., have the power of repelling insects by their odor 
and are thus effectively used in powder form. 
The following table indicates the most common injurious 
insects, means of identification, and the sprays effective for 
their control : 
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Brown-tail moth.... 
Cabbage zebra cater- 
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pillar 
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DESCRIPTION 
Green, red, yellow, black, 
winged or wingless, 
soft-bodied insect 
Larva case made of silk 
and leaves; female 
wingless, never leaving 
bag, where eggs are de- 
posited in spring 
Long-legged, black or 
“striped insect, with dis- 
tinct head and elon- 
gated body; emerges 
from soil in spring 
Flat or round - headed 
larvae 
Compact nests hanging 
during winter ; caterpil- 
lars appearing before 
foliage in spring, 1 in. 
long, brown, marked 
with row of oblique 
white dashes on each 
side of back, two 
orange spots at hind 
end 
Naked measuring worm 
Velvety, green, naked 
worm 
Naked caterpillar, with 
red head and yellow 
body striped with 
black down back and 
sides 
Pinkish, fleshy worm 
which eats cavities 
within apple 
CoNTROL 
Tobacco extract 
Arsenate of lead in 
spring; removal of 
bags in winter 
Arsenate of lead 
Probing with wire; pro- 
tective wash composed 
of 2 qts. of soft soap 
dissolved in 3 gals. of 
water, adding 3 pt. 
earbolie acid and 2 oz. 
Paris green, lime 
added to make thin 
paste. 
Burn winter nests; 
spray with arsenate of 
lead in spring 
Arsenate of lead 
Arsenate of lead in early 
stage, hellebore later 
Arsenate of lead 
Arsenate of lead just 
after blossoms fall 
