8 U. S. DEPARTMENT OF AGRICULTURE BULLETIN NO, 484. 
should be greatly reduced, for it is a very difficult matter to grow 
together successfully a large variety of trees varying widely in their 
requirements. : 3 
The expense necessary to bring about the desirable changes would 
be the following: (1) The sale of a lower grade, and hence a less 
profitable product than would be available under present methods. 
(2) Added expense of cutting, owing to the greater cost of cutting 
scattered trees instead of cutting clear. (8) Added expense of cut- 
ting, owing to the effort which should be made to protect young 
growth of desirable species already started on the ground. (4) The 
cost of planting desirable species where these can not be procured by 
natural seeding. 
FEEDING HABITS OF GIPSY-MOTH CATERPILLARS. 
The Bureau of Entomology has conducted extensive experiments to 
ascertain the feeding habits of the gipsy moth. The methods used 
and the results obtained have been described by Mosher.. The results 
of these experiments have considerable bearing on any forest manage- 
ment which may be prescribed in an effort to control infestations in 
woods. 
Mosher has classified the trees and shrubs of the region according 
to susceptibility to gipsy-moth attack. This classification includes 
several species of trees which are not indigenous and some which 
occur almost exclusively as ornamental trees. Following is a list of 
only the indigenous and naturalized forest trees of the region as 
classified by Mosher. The nomenclature used here is that which 
has been adopted as standard by the Forest Service. It varies 
slightly from that used in Bulletin No. 250. 
Class I: Species that are favored food of the gipsy-moth larvz in all their stages. 
Ash, Mountain (Sorbus americana Marsh.). 
Aspen (Populus tremuloides Michx.). 
Aspen, Large-tooth (Populus grandidentata Michx.). 
Balm of Gilead (Populus balsamifera Linn.). 
Basswood (Tilia americana Linn.). 
Beech (Fagus atropunicea [Marsh.] Sudw.). 
Birch, Gray (Betula populifolia Marsh.). 
Birch, Paper (Betula papyrifera Marsh.). 
Birch, River (Betula nigra Linn.). 
Boxelder (Acer negundo Linn.). 
Oak, Black (Quercus velutina Lam.). 
Oak, Bur (Quercus macrocarpa Michx.). 
Oak, Chestnut (Quercus prinus Linn.). 
Oak, Pin (Quercus palustris Muench.). 
Oak, Post (Quercus minor [Marsh.] Sargent). 
1 Mosher, F. H. Food Plants of the Gipsy Moth in America, U. S. Dept. Agr. Bul. 
250. 39 p., 6 pl. 1915. 
