GIPSY MOTH WORK IjST NEW ENGLAND. 15 



II. — Species favored by the gipsy-moth larvae after the first stage: 



Chestnut. Spruce, black. 1 



Hemlock. Spruce, Norway. 



Pine, hard. 1 Spruce, red. 



Pine, red. Spruce, white. 1 

 Pine, white. 



III. — Species not favored by the gipsy-moth larvae but capable of 

 supporting it: 



Beech, blue. 1 



Birch, black. 



Birch, yellow. 



Cherry, black. 



Elm. 



Gum, black. 1 



Hornbeam, hop. 



Maple, red. 1 

 Maple, silver. 

 Maple, sugar. 

 Pignut. 

 Sassafras. 1 

 Shagbark. 



IV. — Species unfavored by the gipsy-moth larvae in all stages : 



ArborvitEe. 

 Ash, black. 1 

 Ash, white. 

 Butternut. 

 Cedar, red. 1 

 Cedar, white. 



Fir, balsam. 1 

 Hackberry. 1 

 Locust, black. 

 Locust, honey. 

 Sycamore. 1 

 Tulip. 



1 Species of low commercial value. 



During 1914 many food plants were tested which do not ordinarily 

 occur in New England except when planted for ornamental purposes. 

 They grow to a greater or less extent in other sections of the United 

 States, and it was desired to make these tests in order to determine 

 whether these plants would be seriously damaged by the gipsy moth 

 in case it should spread from New England. The information is also 

 useful as a guide to the method of treatment which should be applied 

 in case a small colony should become established in some region 

 outside the present infested area. During the first two summers 

 that these experiments were carried on a sublaboratory was main- 

 tained at Worcester, Mass., where check experiments were con- 

 ducted. The food-plant work is now nearly completed and the 

 results will be brought together shortly for publication. In con- 

 nection with these experiments it should be said that a large number 

 of observations have been made in the field each summer relative to 

 the favorability of different species of trees and undergrowth to 

 gipsy-moth attack. This information serves as a check on the 

 laboratory experiments which are carried on under artificial condi- 

 tions. The observations in the field have in the main been made in 

 definite areas, which were selected for an entirely different purpose 

 and will be considered under the next experimental project. 



