RED SPIDER ON COTTON. gf f0G 
SPRAYING OUTFITS. 
The sort of outfit to be used for spraying the red spider on cotton 
depends mainly on the extent of the occurrence. Many prefer to use 
a small tin atomizer when only a score or so of plants are to be 
treated. These instruments are very economical of liquid and throw 
a very fine, vapory spray which reaches all parts of the plants. The 
bucket pump (fig. 8) and knapsack pump (fig. 9) come into use in 
cases of considerable scattered infestation, or for treatment of a few 
plants in tall cotton where the platform pump would be undesirable. 
The most economic outfit for a severe case comprising several acres 
consists of a barrel pump carried*through the field on a wagon or 
specially constructed vehicle of 
some sort. Figure 10 is from a 
photograph of a portable outfit 
used very successfully in demon- 
stration work in North Carolina. 
It consists of a platform built 
upon the axle and shafts of a 
dismantled hayrake. The wheels 
are large, bringing the axle well 
above the ground, so that the 
vehicle does very little damage 
to the plants. Since the gauge 
of the outfit is 8 feet, it straddles 
two cotton rows, the single draft 
animal walking in the middle be- 
tween these rows. A barrel pump 
with a capacity of 50 gallons is 
mounted on the platform. A boy drives, one man pumps, and two 
men handle the two sprayers. Thorough treatment of 4 acres per 
is readily obtainable with these devices, 
lic. 9.—Knapsack sprayer. (From Quaint- 
ance.) 
NECESSITY FOR THOROUGH SPRAYING. 
Some dissatisfaction has been experienced among certain planters 
who have undertaken to check the ravages of the red spider by 
spraying. With pests which devour the entire leaf, such as potato 
“bugs,” cotton caterpillars, ete., even the careless application of Paris 
green to the top of the foliage often proves entirely satisfactory. 
This is explained by the fact that pests of that kind are constantly 
moving from leaf to leaf and are sure to get some of the poisoned 
foliage. Also, since these insects usually eat completely through the 
leaf, it matters little upon which side the poison falls. With the red 
spider, however, it is very different. A contact insecticide is abso- 
lutely necessary, and since the mite spends its life on the underside of 
