30 ANNUAL RK PORTS OF DKPAIIT.MKNT OF AGRICULTURE, 1940 
To summarize: s.l'J'J cages were put out in 7:') towns, and of 
these 148 in 25 towns attracted 274 moihs. The use of these cages, 
together with the scouting thai followed, resulted in the discovery 
oi 98 infestations totaling ifiOS egg clusters. 
Owing to the delay in the return of W. P. A. labor to this proj- 
ect in tlie summer, it was possible to collect only 81,299 female pupae, 
from which B5,91Q female moths emerged. This made possible the 
preparation of 1.197 charges of attraetant, which were placed in 
cool storage for use in cages in the summer of 1940. 
USE OF AUTOGIRO IN GYPSY MOTH WORK 
Several tests were made in the summers of 1038 and 1939 to 
determine the feasibility of recording gypsy moth defoliation from 
the air. For this purpose an autogiro with two seats for observers 
in addition to the pilot is preferable, but feeding of '2~> percent or 
less cannot be recorded. For this work men must be employe. I who 
have had experience in estimating defoliation, and it has been found 
difficult to carry on with a reasonable degree of accuracy with men 
unaccustomed to flying and making records of this type on map-. 
Work done thus far has been checked in the same territory by the 
usual methods of estimating from the ground, but it has not been 
possible as } T et to determine whether a saving can be made by using 
an autogiro for this purpose. 
During the summer of 1939 defoliation ranging from slight to 
complete covered 492.640 acres, which was a substantia] increase over 
the acreage recorded in the summer of 1938. There was some in- 
crease in Maine. New Hampshire, and Vermont, slight decrease in 
Massachusetts and Rhode Island, and an increase in Connecticut west 
of the Connecticut River. In the entire territory between the Con- 
necticut River and the barrier zone defoliation was slightly Less than 
the previous year. No defoliation was recorded in the barrier zone 
or in New York. New Jersey, or Pennsylvania. 
During June 1940 two areas in Connecticut aggregating 4C»' 1 acres 
were treated with a combination of lead arsenate and fish oil which was 
applied from a specially designed distributing apparatus built into an 
autogiro. This work was done in the towns of Granby and Simsbury, 
in cooperation with the State entomologist wad the Division of Control 
Investigation- of this Bureau. It demonstrated that good distribution 
of the poison can be accomplished in this way. but complete results 
will not be available until the areas treated have been finally checked 
a fter the foliage is down. 
SCOUTING AND TREATMENT FOR THE GYPSY MOTH 
Scout ing resulted in the discovery of many -mall, scattering infest a- 
t ion- in the Massachusetts and Connecticut portion- of tin 1 hai rier /.one. 
in the southern part of Bennington County and sections of Rutland 
and Addison ('(.unties in Vermont, and m several New York towns in 
the region of the Massachusetts State line. The indication- are con 
elusive that these infestations became established by wind spread of 
-mall caterpillars from infested area- to the east of the zone in the 
Spring of L939, and to some extent at least from fragments of egg 
< luster- dislodged from t ree growth during the hurricane of September 
