432 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 13 
On the above date (September 16) an important conference took place at St. 
Thomas, Ont., at which the following men were present: Messrs. W. R. Walton and 
L. H. Worthley, of the United States Bureau of Entomology; Dr. E. P. Felt, state 
entomologist of New York; Dr. J. H. Grisdale, deputy minister, Dominion Depart¬ 
ment of Agriculture; Prof. L. Caesar, provincial entomologist, Ontario, and Messrs. 
Gibson, McLaine, Keenan and Vroom of the Dominion Entomological Service. 
Fields of field corn in the vicinity of St. Thomas were investigated, some of which 
were very seriously infested, in one field probably a commercial loss of from 20 to 25 
per cent had resulted. 
Arthur Gibson 
Acting Dominion Entomologist, Department of Agriculture, 
Ottawa, Canada 
The Green Japanese Beetle (Popillia japonica), which was discovered in New 
Jersey several years ago and which has been confined to that state, is now known to 
occur in Pennsylvania along the Delaware River for a distance of nearly eight miles 
and extending back from the river one-fourth to one and one-half miles. The Penn¬ 
sylvania infestation was first discovered in July, 1920, by Mr. Fred Worsinger, a 
scout for the Pennsylvania State Department of Agriculture. Beetles were first 
found in Pennsylvania at Torresdale and here the beetles are most abundant and that 
location is apparently the center of the Pennsylvania infestation. 
The conditions in Pennsylvania are apparently ideal for the beetle and there is 
reason to believe that it will increase and spread at the same rate as in New Jersey. 
Just how the beetle became established in Pennsylvania is problematical. The 
supposed center of infestation is at Torresdale and up the river from the nearest 
known 1919 infestation in New Jersey. It is not, therefore, likely that the beetle 
flew across the river. A club house in New Jersey within the infested area affords 
considerable traffic across the river, particularly during the summer months when the 
beetles are active. Weeds and rubbish are sometimes carried up the river with the 
tide from the New Jersey shore to the Pennsylvania side. Either of these last two 
possibilities are likely methods of transportation. 
Although some scouting was done in Pennsylvania in 1919, there is little doubt that 
a few beetles occurred on that side of the river a year ago. 
John J. Davis. 
Riverton, N. J., Sept. 2, 1920. 
Round-Headed Apple Tree Borer Injuring Apple Fruits. On July 20th, while 
inspecting an orchard near Scotland, Pa., the writer observed a considerable 
number of large feeding scars on apple fruits. At first it was somewhat puzzling 
to state the real cause of the damage, but after a more thorough search the real cul¬ 
prit was found to be the adults of Saperda Candida. 
These feeding punctures were frequently 5 to 10 mm. in width, 10 to 20 mm. in 
length and 1 to 2 mm. in depth. In some instances the fruit was marked by trough¬ 
like gouges 4 mm. in width and 8 to 10 mm. in length. The work of this beetle may 
be determined by the rather large serrate margins of the feeding scars, this being 
caused by the sharp, pointed mandibles. Not infrequently the surface of the fruit 
bears string-like frass particles, 3 to 6 mm. in length. 
The amount of feeding in this orchard was considerable as most of the tree trunks 
were badly infested with borers. 
Under laboratory conditions the adult beetles caused injury to fruits similar to the 
injury observed in the field thus proving conclusively that the adult borer was re- 
