FOOD PLANTS OF THE GIPSY MOTH IN AMERICA. 33 
POPLAR AND RED SPRUCE. 
The larvze fed freely on the poplar in all stages, but very slightly on the 
spruce, no feeding being noted in the first two stages. They grew steadily and 
to fairly large size, and a small number reached the adult stage. 
CLASSIFICATION OF FOOD PLANTS. 
As a result of the experiments with single food plants and combi- 
nations, it is possible to draw up a classification of the trees and 
shrubs tested as regards their susceptibility to attack by the gipsy 
moth. 
They have been arranged in the following classes: 
Class I. Species that are favored food for the gipsy moth. 
Class II. Species that are favored food for the gipsy moth after 
the early larval stages. 
Class III. Species that are not particularly favored, but upon 
which a small proportion of the gipsy-moth larve may develop. 
Class IV. Species that are unfavored food for the gipsy moth. 
CLASS I.—Species that are favored food for the gipsy-moth larve. 
Alder, Spreckled. Oak, Rock Chestnut. 
Apple. Oak, Dwarf Chestnut. 
Ash, Mountain. Oak, Bur. 
Aspen, American. Oak, Pin. 
Aspen, Large-toothed. Oak, Post. 
Balm-of-Gilead. Oak, Red. 
Beech, American. Oak, Scarlet. 
Birch, Gray. } Oak, Bear. 
Birch, Paper. Oak, Shingle. 
Birch, Red. Oak, Swamp White. 
Blueberry (V. angustifolium). Oak, White. 
Box Elder. Poplar, Lombardy. 
Gum, Red. Rose, Pasture. 
Hawthorn. — Service-berry. 
Hazelnut. Sumac, Mountain. 
Hazelnut, Beaked. Sumae, Scarlet. 
Larch, American. Sumac, Staghorn. 
Lareh, European. Willow, White. 
Linden, American. Willow, Glaucous. 
Linden, European. Willow, Sandbar. 
Oak, Black. Witch-hazel. 
Cuiass II.—Species that are favored food for gipsy-moth larve after the earlier 
larval stages, 
Chestnut. Pine, White. 
Hemlock. Plum, Beach. 
Pine, Pitch. Spruce, Black. 
Pine, Red. Spruce, Norway. 
Pine, Scotch. Spruce, Red. 
Pine, Jack. Spruce, White. 
Pine, Western White. 
