148 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
of the transmission of fire blight by these insects. Rapidly growing 
two-year-old apple shoots in the greenhouse were infected with the 
organism obtained from exudate from infected twigs in the orchard. 
These shoots were enclosed in fine netting bags, and when the disease 
had developed, the leaf-hoppers were introduced. After feeding for 
from several hours to a day, the insects were transferred to healthy 
shoots and allowed to feed. 
The results may be briefly summarized as follows: 
Expt. No. 1. Five adults Empoasca unicolor . Negative 
Expt. No. 2. Two adults E. unicolor . Doubtful 
Expt. No. 3. Fourteen nymphs E. mali .. Positive 
Expt. No. 4. One adult E. unicolor . Negative 
Expt. No. 5. Two nymphs E. mali . Negative 
Expt. No. 6. Six nymphs E. mali . Positive 
Expt. No. 7. Ten nymphs Empoa rosce . Negative 
Expt. No. 8. Ten nymphs Empoasca mali . Positive 
Expt. No. 9. Five nymphs E. mali . Negative 
Expt. No. 10. Two adults E. unicolor . Negative 
Of the five transfers of the nymphs of E. mali, three gave positive 
results. The tests with adults of E. unicolor were negative, except in 
one case which was doubtful. The test with Empoa rosce resulted 
negatively. The negative results should not be taken to indicate that 
these species are incapable of transmitting the disease. 
IMPORTANT NOTICE 
At the Pittsburgh meeting of the Association it was voted that the Secretary be in¬ 
structed to prepare an Honor Roll of the members of the Association who are in the 
United States or allied service. 
In order to do this and secure an accurate record, it is necessary to have the fullest 
cooperation of the members. It is requested that each member send to the under¬ 
signed as soon as possible the records of any members of the Association who are in 
the services above mentioned, with as much detail as possible as to their rank and the 
regiment or other military unit to which they are attached. 
A. F. Burgess, 
Secretary. 
