1024 ; I. M. Hawiery 
placed in field cages with beans free from the disease. Blight did not 
appear In any of the cages. 
In examining bean seed punctured by Adelphocorus rapidus, Dr. Burk-. 
holder has found undetermined bacteria present in large numbers. It 
would seem, therefore, that this common sucking insect might be capable 
of transmitting the organism that causes bean blight, but most of the 
evidence thus far obtained is negative. 
It is unusual to find A. rapidus present in sufficient numbers to be 
the sole agent in the spread of blight. The writer still feels that the 
commoner Lygus pratensis may sometimes carry the disease as it migrates 
from plant to plant in search of food, and further experiments should be 
carried on with Empoasca mali before it is safe to say that this species is 
not partially blamable for the spread of the bight organism. Plant lice 
have been found but rarely on beans in New York, and never in quantities 
that would justify placing much blame on them. 
Dr. Robert Matheson, working in conjunction with Dr. Donald Reddick, 
of the Department of Botany at Cornell University, found that he could 
transfer bean mosaic, the causal organism of which has not been isolated, 
from one bean plant to another by means of an undetermined plant louse, 
but that Empoasca mali, Lygus pratensis, Systena hudsonius, Systena 
frontalis, Epitrix cucumeris, and Tetranychus telarius, seemed unable to 
transmit the disease. 
