FOOD PLANTS OF THE GIPSY MOTH IN AMEEICA. 



33 



Poplar and Red Spruce. 



The larvse 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 larvse may develop. 



Class IV. Species that are unfavored food for the gipsy moth. 



Class I. — Species that are favored food for the gipsy-moth larvm. 



Alder, Spreckled. 



Apple. 



Ash, Mountain. 



Aspen, American. 



Aspen, Large-toothed. 



Balm-of-Gilead. 



Beech, American. 



Birch, Gray. 



Birch, Paper. 



Birch, Red. 



Blueberry (V. angustifolium). 



Box Elder. 



Gum, Red. 



Hawthorn. 



Hazelnut. 



Hazelnut, Beaked. 



Larch, American. 



Larch, European. 



Linden, American. 



Linden, European. 



Oak, Black. 



Oak, Rock Chestnut. 

 Oak, Dwarf Chestnut. 

 Oak, Bur. 

 Oak, Pin. 

 Oak, Post. 

 Oak, Red. 

 Oak, Scarlet. 

 Oak, Bear. 

 Oak, Shingle. 

 Oak, Swamp White. 

 Oak, White. 

 Poplar, Lombardy. 

 Rose, Pasture. 

 Service-berry. 

 Sumac, Mountain. 

 Sumac, Scarlet. 

 Sumac, Staghorn. 

 Willow, White. 

 Willow, Glaucous. 

 Willow, Sandbar. 

 Witch-hazel. 



Class II. — Species that are favored food for gipsy-moth larvw after the earlier 



larval stages. 



Chestnut. 



Hemlock. 



Pine, Pitch. 



Pine, Red. 



Pine, Scotch. 



Pine, Jack. 



Pine, Western White. 



Pine, White. 

 Plum, Beach. 

 Spruce, Black. 

 Spruce, Norway. 

 Spruce, Red. 

 Spruce, White. 



