5) 
syringe, if applied every day or two, will soon rid rosebushes of the 
pest. This is at the same time an excellent remedy for rose aphides 
or plant-lice. The insects are dislodged, fall to the ground, and are 
unable to return to reinfest the bushes. This remedy was tested 
practically by Dr. L. O. Howard many years ago. 
Paris green.—Where it is possible to apply them without danger 
of poisoning human beings or disfiguring the plants for ornament, 
different poisonous preparations are useful. Of these, Paris green, 
either dry or in solution, arsenate of lead, and white hellebore are 
good remedies. Paris green is best used as a spray in the proportion 
of an ounce to a gallon of water. Applied dry, it is mixed with 20 
parts of flour or similar diluent and puffed on the plants by means of 
a powder bellows or insufflator. For use in large gardens, however, the 
poison is employed at the rate of 1 pound to from 75 to 125 gallons 
of water, lime being added in about the same proportion as Paris 
green to prevent scorching. For properly mixing and applying this 
insecticide a sprayer of good quality should be used. Sprinkling 
with a watering pot or with a whisk broom will not answer the pur- 
pose and is, moreover, dangerous to tender foliage. The Paris green 
is first mixed with a small quantity of water into a fine paste before 
the bulk of water is added and should be churned in the sprayer or 
force pump until thoroughly blended. The resulting mixture, being 
a mechanical one, is not constant and the arsenical sinks to the bot- 
tom. The solution should therefore be constantly stirred while 
being applied in order that an even application may be made. In 
applying an arsenical spray an effort should be made to reach all of 
the leaves, which may be accomplished by spraying from two sides. 
Two or three applications will suffice for the spring generation of 
rose slugs. Scheele’s green and some other arsenicals can be used 
instead of Paris green. 
Arsenate of lead.—< still more valuable insecticide for such insects 
as rose slugs and other leaf feeders is arsenate of lead, but its use is 
open to the objection that it discolors the leafage, leaving a white 
deposit, which is not, however, permanent. It is applied in practi- 
cally the same manner as Paris green and is a less poisonous arsenical, 
and, being sold in paste form, is used at a considerably greater 
strength—about 1 pound combined with 15 to 25 gallons of water or 
Bordeaux mixture. Being adhesive, it adheres more firmly to the 
leafage and is much less likely to produce scorching." 
Hellebore.—Hellebore is used at the rate of 1 ounce to from 2 to 3 
gallons of water, and kills by contact as well as by its poisonous effects 
@ Additional information in regard to the preparation and use of arsenate of 
lead and other insecticides is given in Farmers’ Bulletin 127, which may be 
had gratis on application to the U. S. Department of Agriculture. 
[Cir. 105] 
