66 PAPERS ON INSECTS AFFECTING VEGETABLES. 
Paris green will kill the sugar-beet webworm when used at the rate 
of 2 pounds in 100 gallons of water, but its action is comparatively 
slow. It can also be safely used on sugar beets at the rate of 4 
pounds in 100 gallons of water, although this amount is excessive and 
unnecessarily expensive. All things considered, either formula No. 
1 or formula No. 2 can be depended on for the most satisfactory 
results. 
Many beet growers demand that an insecticide to be used against 
webworms shall be immediately effective. It is of course unreason- 
able to expect immediately fatal results from a stomach poison. 
When Paris green is properly applied against this webworm at the 
rate of 3 pounds in 100 gallons of water, a fairly large number of 
dead webworms will be found about the sprayed beets at the end of 
24 hours, and at the end of three days practically all webworms 
should be dead. 
Dusting with Paris green and lime has also proven effective against 
this webworm when used at the rate of from 2 to 4 pounds of the 
poison in 100 pounds of air-slaked lime. The " dust " may be ap- 
plied by shaking it from a coarse sack or with a " powder gun." 
This method is slow, would increase the cost of application more than 
50 per cent, and is difficult to apply in an even coating. 
Occasionally a field of beets may have been irrigated just before 
an infestation of webworms becomes apparent, and in such a case 
the soil is likely to be so wet that the prompt use of a sprayer will 
prove impracticable and dusting may then be employed to advantage. 
SPRAYING MACHINERY. 
For spraying large areas of sugar beets a geared traction sprayer 
of 125 gallons' capacity (figs. 20-22) will prove profitable; but for 
the average grower, whose planting does not exceed 20 acres, this 
type of machine is too expensive and unnecessarily large, and a 
smaller, much cheaper sprayer, which can be assembled at home, will 
give satisfactory results. Such a sprayer may be fitted up by mount- 
ing a spray pump in a 50-gallon barrel on an ordinary one-horse, 
two-row beet cultivator, from which the " handles " and " shoes " 
have been removed. This arrangement will be readily understood 
by referring to the accompanying illustrations (figs. 15, 1G). The 
four-row attachment is connected with the pump by a rubber hose 
and is fastened to sections of plank which are bolted to the culti- 
vator frame and extend out behind the wheels. The row attachment 
is made of J-inch and J-inch iron pipes and can be put together by a 
plumber. Three types of row attachments are illustrated. Number 
1 (fig. 17) is the simplest and will give satisfaction under ordinary 
conditions. This may be built to cover eight rows of beets instead 
of four. The eight-row attachment, however, is rather cumbersome 
