30 NEW YORK STATE MUSEUM 
also shown the continued practical immunity from infestation of 
any plants except corn in this State, thus justifying the restriction 
of quarantine in the single brooded areas to corn, broom corn, 
sorghum and Sudan grass and the releasing from such restrictions 
of the numerous plants coming within the provisions of the quaran- 
tine as enforced in the two brooded Massachusetts area. This modi- 
fication in New York State has not reduced the protection given to 
uninfested territory through quarantine and at the same time it has 
greatly lessened the expense of administration and removed many 
vexatious restrictions upon farm produce. The probability of this 
insect spreading to the warmer areas of the State, particularly the 
lower Hudson valley and Long Island and the possibility of its 
developing two generations and causing serious injuries in that terri- 
tory as in eastern Massachusetts, amply justifies the maintenance of 
the quarantine for the time being, not to mention the probability of 
troublesome complications with other States, if all restrictions were 
removed. 
The gipsy moth (Porthetria dispar Linn.). This pest 
has in the past few months spread to such an extent as to seriously 
menace a considerable proportion of New York State. The Ento- 
mologist has devoted considerable time to a study of the situation 
and through conferences with representatives of the United States 
Department of Agriculture, the New England States and New 
Jersey and various officials of this State, material progress has been 
made in working out a practicable and constructive policy for pre- 
venting the spread of this insect over large portions of New York 
State and the great expense incident thereto — that is the cost of 
control, the latter usually not entirely satisfactory, and the very 
material loss resulting from widespread depredations. The history 
of this insect shows a gradual spread from the point of original 
infestation at Medford, Mass. in 1868 until the infested area includes 
a considerable proportion of the New England States and touches 
the eastern border of New York State for a distance of some 75 
miles. This has occurred in spite of systematic efforts to restrict 
spread and although experience, throughout much of this period, 
has shown the practicability of exterminating isolated infestations 
and preventing spread, this gradual dissemination has resulted from 
a well intentioned, though parsimonious policy of delayed or insuffi- 
cient appropriations, frequently both. The infested adjacent New 
England area is a rough, thickly wooded territory and it is therefore 
proposed to prevent spread as well as may be along the present 
