FOOD PLANTS OF THE GIPSY MOTH IN AMERICA. 1% 
Porson Ivy (Toxicodendron radicans [L.] Kuntze). 
Feeding by all stages except the sixth hag been noted upon poison ivy. This 
resulted in a number of notches and small holes being made in the leaves. It 
is not a favorable food plant. 
JUNIPER, COMMON (Juniperus communis L.). 
Many of the field observers have seen feeding by gipsy-moth larve on this 
species in all stages, usually on the new growth. 
Laboratory work shows that this species will not maintain this insect through 
the larval stage. 
KENTUCKY COFFEE-TREE (Gymnocladus dioica [L.] Koch). 
This species was tested at Worcester and also at the Melrose Highlands 
laboratories. In the first stage, before the bud scales dropped, there was con- 
siderable feeding. Later there was practically no feeding in any of the stages. 
No field observations have been made on this species. 
AMERICAN LARCH (Larix laricina [Du Roi] Koch). 
Tray experiments show this to be a favored food for the gipsy-moth larve. 
They fed freely in all stages and grew rapidly and to large size. They were, 
however, badly attacked by disease, but adults were secured from experiments 
begun with first-stage caterpillars. 
No field observations were made on this species. 
EUROPEAN LARCH (“aria decidua Mill.). 
Mr. Proctor notes feeding by first-stage larve on this species and in a 
diminishing degree in the second and third stages, after which no more feeding 
was noted. Observations were made in only one locality, and the species was 
not tested in the trays in the laboratory. 
MOUNTAIN LAUREL (Kalmia latifolia L.). 
Tray experiments show that this laurel will not support life of the gipsy-moth 
larvee, as they would not feed upon it to any extent and die rapidly from starva- 
tion. 
Two observers have seen siight feeding on this shrub by first, fourth, and 
fifth stage larve, the two latter stages working on the blossoms as well as the 
leaves. | 
SHEEP LAUREL (Kalmia angustifolia 1.). 
Field observations and tray experiments show that this species is distasteful 
to the caterpillars, as they eat only when no other food is available and then 
fo a very limited extent. In the trays the larve died rapidly when furnished 
with no other food. ; 
Swamp Hupotrys (Hubotrys racemosa [L.] Nutt.). 
Considerable feeding by all larval stages has been observed by Mr. Schaffner 
on this species in Middleboro. 
In the trays it does not appear a very favorable food and ~ no pupze were 
obtained, as all larve died of disease and starvation. 
92719°-—15—_3 
