fi 
with a power sprayer or with a com- 
pressed-air or knapsack-type sprayer. 
Emulsion sprays are usually easier to 
apply with hand sprayers than are 
sprays made from wettable powders. 
The quantity of spray to apply de- 
pends on the size of the animal and the 
amountofhair. About 2 quarts of 0.5- 
percent spray is sufficient for most 
cows. Insome sections of the country, 
cattle owners have been using up to 
1.5-percent methoxychlor sprays, or 
even higher percentages, but they re- 
duce the amount of spray per animal 
proportionately. A very quick and 
satisfactory method for using methoxy- 
chloron small herds of dairy animals 
is to thoroughly mix cne-half pound of 
50-percent methoxychlor wettable pow- 
der in 21/2 gallons (a 10-quart pail) 
of water. Pour the mixture into a 3- 
gallon compressed-air or knapsack- 
type sprayer and pump up tothe highest 
pressure possible by hand. One full 
sprayer prepared in this manner will 
treat 10 cows at the rate of about 1 
quart per cow. It is not necessary to 
cover the entire animal with the spray. 
Good control of horn flies can be ob- 
tained by applying the insecticide with 
a sponge. Complete coverage, how- 
ever, willhelp to control lice and other 
insects. One application will usually 
be effective for about 3 weeks. 
Pyrethrum sprays also may be used 
forhornfly control. The effectiveness 
of pyrethrum is increased when used 
with another chemical such as piper- 
onyl butoxide. An emulsion concen- 
trate containing about 1 percent of 
