Circular 21 - Insecticides and Subsidiary Ifeterials 46 
LB/E SULFUR (DRY) 
Lime-sulfur is used as a dip or surface 
treatment for protecting rough and green as 
well as seasoned woods against powder-post 
beetles. The material acts as a repellent to 
the insects. 
This material consists of lime and sul- 
fur boiled together to form a series of salts. 
The* dry form is prepared by adding a stabilizer 
such as cane sugar and then evaporating to 
dryness. Lime-sulfur is used as a summer 
fungicide and insecticide for fruit trees and 
is of special value for the control of scale 
insects. It is frequently used in connection 
with other insecticides for the simultaneous 
control of chewing and sucking insects as well 
as certain fungus diseases. 
The cost of lime-sulfur in bags and 
drums in carload lots varies in different parts 
of the United States but ranges from 7i to 12 
cents per pound. 
For manufacturers and distributors 
see numbers 2, 7, 19, 22, 69, 90, and 101 of 
list at end of this circular. 
LINS2ED OIL, BOILED 
Linseed oil is used to pre2')are certain 
insecticides and to treat seasoned wood prod- 
ucts in the control of Lyctus powder-post 
beetles. The boiled linseed oil, while still 
hot, is preferable for use on wood products 
since it penetrates and dries more rapidly 
than the raw linseed oil. It stains wood 
slightly yellow. 
