160 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 16 
where there is a heavy growth of large hollow trees in cavities of which 
the egg masses of last year were sheltered from the crews and that much 
of this growth could not be sprayed because of the feeding of herds of 
cattle in areas immediately adjacent thereto. This year a campaign 
of cutting this growth has been undertaken and is rapidly going for¬ 
ward. 
Infestation in all outlying areas has been apparently cleaned up, the 
colonies have dropped from 760 to 226, and the egg masses from over 
3,000,000 have been reduced to 909. 
It is, of course, not sufficient to pursue a campaign of extermination 
in areas already known to be infested and territory bordering thereon, 
but one must make sure that no other infestations are in process of 
development and equally certain that no new establishments are taking 
place. 
To handle this phase of the work against the gipsy moth a separate 
scouting crew is maintained and operated by the New Jersey State 
Department of Agriculture. This crew scouts the supposedly infested 
sections of the state, other than the territory bordering the infestations, 
which are being looked over by the co-operative force. It also examines 
all shipments of incoming plants and products deemed likely to carry 
gipsy moth. 
The value of this supplementary work is shown by finding a year or 
more ago of one new but slight infestation and the interception of 14 
cases of gipsy moth infestation on in-coming nursery stock. 
The New Jersey authorities hold that the extermination of the gipsy 
moth within the state’s borders is a good proposition and worth the 
money it costs even if the New England infestation does slowly move 
southward but they hold it to be far better business if an end can be put 
to this movement and a “Thou shalt not pass” line be erected and main¬ 
tained somewhat on the lines laid down by Dr. Felt in his paper of 
yesterday. Not only should such a line as that suggested by Dr. Felt 
be established and maintained but all infestations beyond it should be 
prom ply exterminated. 
In a meeting held at Albany recently and attended by Canada, 
New England, New York, New Jersey and United States Department 
of Agriculture representatives. It was planned: 
(1) To exterminate the infestations in New York and New Jersey. 
(2) To hem in the New England infestations by a “Thou shalt not 
pass” line. 
(3) Exterminate all infestations that may later be found beyond it. 
