Le FARMERS’ BULLETIN 674. 
attention need be paid to the inner portions of the tree, as thrips do 
not oceur there. 
One should not attempt to spray too many trees with a single 
outfit, and an application once commenced should be finished within 
Fic. 7.—Correct position of operatorinspraying. (Original.) 
10 days. It has been 
found after much experi- 
ence that only about 25 
acres of from 12 to 18 
year old trees or 50 acres 
of from 5 to 7 year old 
trees can be successfully 
handled with one gasoline- 
power sprayer. This is 
calculated on the basis of 
ten 200-gallon tanks of 
spray per day, allowing 8 
gallons per tree for trees 
from 12 to 18 years old or 
4 gallons for trees from 
5 to 7 years old, allowing 
100 trees to the acre. It 
is a common mistake to 
use the wash too spar- 
ingly and to try to get 
over the ground too fast. 
Table I, published: also in 
a former report,'4was pre- 
pared to show approxi- 
mately the correct amounts 
to apply to trees of dif- 
ferent ages, and from it 
the quantity of spray material required for the season may be 
estimated. 
TABLE I.—Quantities of liquid required in spraying for the citrus thrips. 
Age of aise 
Pues One application. 
Gallons | Gallons 
aati dilute | per acre 
eears. spray of 100 
per tree. trees. 
2 to 3..- 2 200 
5to7...) 4 ~ 400 
8to10-..} 5 500 
12to 18.) 8 800 
1Jones, P. R., and Horton, J. R. The Orange Thrips: A Report of Progress for the Years 1909 and 
1910. U.S. Dept. Agr., Bur. Ent., Bul. 99, pt. 1, iv+16 p., 2 fig., 3 pl., Mar. 6, 1911. Seep. 15. 
