44 BULLETIN 132% U. S. DEPARTMENT OF AGRICULTURE 
modified somewhat in connection with our laboratory and green- 
house work in Washington. Large numbers of plants treated at 
Brooksville have been sent to Washington and planted in the depart- 
ment's plant-inspection house and in the test garden at Bell, Md. 
In all cases it has been found that a treatment of five minutes in 
water at a temperature of 50° C. (122° F.) kills the mites but does 
not injure the plants or rhizomes. Many thousands have been 
treated in this way, and no such plants have been found to be 
infested. So far, the mite has been confined to the garden at 
Brooksville, and as these plants are soon to be destroyed and the 
garden abandoned it is hoped that there will be no further trouble 
from this pest. 
