20 BULLETIN 1469, U. S. DEPARTMENT OF AGRICULTURE 
trees, upon sidewalks, fences, and buildings, and even entering 
dwellings. The feeding of small larvae in the early fall is some- 
times so severe as to cause a browning and premature dropping of 
the leaves. 
No heavy feeding of this insect in New England was observed, 
except on poplars (fig. 5, B), until the summer of 1925, when willows 
(fig. 5, A, C) were also severely defoliated. Experiments on food 
plants have shown that this insect can mature when scrub oak 
forms a large part of its food. Similar experiments suggest that 
larvae of the satin moth might 'mature when black oak is a part of 
their diet. Such data, together with a European report including 
oak as one of the food plants of these larvae, leave open the possibility 
that under certain conditions this insect may attack some trees not at 
present included in the list of its favored food plants. 
There are certain areas in this country where poplar is an impor- 
tant pulp tree and is being planted for that reason. In some areas 
on Cape Cod, Mass., white poplars are the predominating shade 
trees, and severe injury to them will result from heavy defoliations 
caused by this insect. 
In many sections in the West trees of the genus Populus constitute 
the predominating shade and ornamental trees. Should this insect 
become established in such areas, it might become a pest of the first 
magnitude. 
QUARANTINE 
The habit of this insect of hibernating under very small and 
inconspicuous webs on the trunks of trees (fig. 3, E) and small 
branches of its favored food plants makes it impossible to inspect 
nursery stock properly and be sure that it is free fr.om infestation. 
In order to protect the territory in this country not infested by this 
introduced insect, a quarantine, No. 53, was promulgated by the 
Secretary of Agriculture and made effective on and after January 
1, 1922. It has been revised annually, the last revision being- 
effective November 15, 1926. This quarantine prohibits the move- 
ments of all species and varieties of poplar (Populus) and willow 
(Salix) trees, and parts thereof capable of propagation, from the 
area designated as infested to noninfested territory. 
The area designated as infested by the satin moth comprises the 
city of Bangor, Me., and the following towns and all the territory 
between them and the Atlantic Ocean : 
Vinal Haven, North Haven, Islesboro, city of Belfast, Northport, Lincolnville. 
Hope, Union. Waldoboro, Nobleboro, Newcastle, Alna, Dresden, Gardiner. Rich- 
mond, Bowdoin, Webster. Greene, Auburn, Poland, Casco, Naples, Sebago, 
Hiram, and Porter. Maine; Eaton, Conway, Madison, Tain worth, Moultonboro, 
Meredith, Sanbornton. Franklin. Salisbury. Warner, Henniker, Deering. Ben- 
nington, Greenfield, Peterboro, JafTrey, Sharon, and New Ipswich, Neio Hamp- 
shire; Ashburnham, Winchendon. Templeton. Phillipston. Athol, Barre, 
Oakham. Spencer. Brookfield. Brimfield. Sturbridge. Southbridge. and 
Dudley, Massachusetts ; Thompson, Connecticut; Burrillville, Glocester, Foster, 
Coventry, West Greenwich, Exeter, Hopkinton, and Westerly, Rhode Island; 
Stonington, Connecticut. 
The following counties and all the territory between them and the 
Pacific Ocean are designated as infested by the satin moth : 
Whatcom, Skagit, Snohomish, King, Pierce, Lewis, and Skamania, 
Washington. 
