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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 13 
extending beyond the infested area, the beetles will continue to have 
ideal and easy means of traveling out and establishing themselves in 
new areas at a rapid rate. With these favorite food plants eliminated 
the beetles find it much more difficult to spread and there is far less 
opportunity and chance of their entering vehicles or fruit and vege¬ 
table packages and in this way being carried away. A scarcity of 
favorite food plants and breeding areas naturally interferes with the 
unrestricted multiplication of the beetle, and likewise such conditions 
will also make it necessary for the beetles to concentrate on fewer 
plants and in fewer places, thus making the hand collecting of beetles 
more profitable and the scouting more efficient. 
In this connection the War Department was requested to cooperate 
to the extent of mapping the area, the object being to photograph and 
prepare a mosaic of the area from an aeroplane, to enable us to plan our 
clean-up to better advantage and to impress more clearly upon the 
farmers the needs of clean-up work on their individual farms. The 
War Department detailed an outfit for this purpose, but owing to the 
foggy conditions and equipment unsuited for these conditions satis¬ 
factory photographs were not obtained, but the work will probably be 
repeated next spring under more favorable conditions and with equip¬ 
ment better suited for our needs. . 
For the entire project it was estimated that a minimum of $70,000, 
in addition to the funds already appropriated, would be necessary and 
consequently this amount was requested. Of this amount $45,000 
were granted and since it is impossible to construct and maintain a 
barrier as planned we are now endeavoring to secure the cooperation 
of the individual farmers to clean up according to our directions. 
Whether the cooperation will be sufficiently general to enable us to 
complete and maintain the barrier cannot be foretold. 
3. To Reduce Their Numbers it is planned to continue hand¬ 
collecting the beetles, cyaniding to destroy the grubs and to secure the 
cooperation of farmers to the extent of following certain agricultural 
practices. 
(a) Hand Collecting. The past season collectors were employed to 
collect beetles in the heaviest infested areas, but only at such times as 
when inspection and similar work permitted. Boys were encouraged 
to collect beetles for which we paid 60 cents a quart (average 3,376 
beetles) early in the season and 80 cents later on. In this way we 
destroyed approximately one and one-half millions of beetles, at least 
40 per cent of which were females. Hand collecting is believed to be 
very profitable, especially since the use of arsenicals is impractical, 
from our present knowledge, and this method will be pushed another 
season. 
