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. 



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. (3) 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. 1 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 larvae in all their stages. 



Ash, Mountain (Sorbus americana Marsh.). 



Aspen {Populu8 tremuloides Michx.). 



Aspen, Large-tooth (Popuhis grandidcntata Michx.). 



Balm of Gilead (Popuhis balsamifera Linn.). 



Basswood (Tilia americana Linn.). 



Beech (Fagus atropunicea [Marsh.] Sudw.). 



Birch, Gray (Betula popuUfoUa Marsh.). 



Birch, Paper (Betula papyrifera Marsh.). 



Birch, River (Betula nigra Linn.). 



Boxelder (Acer negundo Linn.). 



Oak, Black (Qucrcus velutina Lam.). 



Oak, Bur (Quercus macrocarpa Michx.). 



Oak, Chestnut (Quercus prinits 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. Bui. 

 250. 39 p., 6 pi. 1915. 



