GIPSY MOTH WORK IN NEW ENGLAND. 
17 
infested territory has been divided into five sections, and the towns 
in which the points were located are indicated on the accompanying 
map. 
Table III. — Gipsy moth egg clusters recorded in observation points, 1910-1914. 
Locations. 
Number 
of points. 
Egg clusters. 
1910 
1911 
1912 
1913 
26,147 
9,603 
17, 603 
9,763 
8,222 
1914 
Eastern New Hampshire and Maine 
32 
33 
34 
30 
41 
2,074 
14,8S5 
29,399 
10, 742 
11,486 
31, 751 
23,032 
47,419 
26, 409 
39,319 
29,637 
28, 618 
30, 345 
28, 301 
42, 451 
18.234 
13.228 
31,316 
17, 159 
31,065 
170 
68,586 
167, 930 
159, 352 
71,338 
111,002 
The count of the egg clusters recorded under 1910 was made in the 
fall of 1911 and covered all clusters which were found to have hatched 
and therefore belong to the 1910 brood of moths. This count was 
more or less inaccurate, as many of the egg clusters were removed 
from the trees after a year's exposure to the elements. The count 
indicates, however, that there was a large increase in infestation 
between 1910 and 1911, and that in 1912 the gross infestation was 
slightly reduced. A heavy reduction occurred in 1913, while in 1914 
a considerable increase was noted but not nearly as great as was the 
case from 1910 to 1911. 
The conclusion which will inevitably be drawn from these figures 
will not apply to other localities in the infested area. There are many 
locations where a marked increase was noted in 1913 or where a 
marked decrease was noted in 1914, but taking the territory as a 
whole it gives a general idea of the trend of increase or decrease for 
the period covered. 
Knowing the conditions, one can not fail to be impressed with the 
results that have already become apparent from the introduction of 
parasites and the work of the wilt disease. Although the season of 
1914 was not as favorable to the natural enemies as was the case in 
1910, the proportional increase in the number of egg clusters was 
considerably smaller. Unfavored food plants have, of course, been 
instrumental in holding down the increase in some of the points, but 
the amount of infestation in points where unfavored food predom- 
inates has remained rather constant, so that it has not been as great 
a factor in the reduction noted as the other elements just mentioned. 
Much careful work has been required to secure this data. For 
about six months in each year upward of 20 men have been engaged 
in this work. During the summer a part of the men made observa- 
tions on the feeding habits of the gipsy moth caterpillars on different 
food plants in their sections. Observations on the presence of 
