FOOD PLANTS OF THE GIPSY MOTH IN AMERICA. 19 
RED MAPLE (Acer rubrun L.). 
When this maple is mixed with other trees more favored by gipsy-moth larvze 
and the infestation is light, the feeding in all stages is light. When the 
infestation is heavy and the other trees in the combination become defoliated, 
or nearly so, the feeding becomes more intense, and in some cases defoliation 
of this maple results. It is not, however, a favored food and will usually be 
deserted for other species. 
In the laboratory, aduits were obtained from trays started with first-stage 
larvee on this foliage. 
SILVER MAPLE (Acer saccharinum 1.). 
In trays, first-stage larve did not develop and produce adults, as all the 
former died in the fourth or earlier stages. 
No field observations were made on this species. This is not as favored a 
food as red maple. 
STRIPED MAPLE (Acer pennsylvanicum L.). 
Larve started on this foliage in any stage failed to reach the next stage. 
It is one of the most unfavored of the maples. 
No feeding of any amount was observed in the field. 
SucGAR MAPLE (Acer saccharum Marsh.). 
Very few observations on this species have been made in the field, but the 
observers are agreed that it is an unfavored food. 
In the trays at Worcester and Melrose Highlands the first-stage larve grew 
fairly well and a few male and female moths were obtained. It is less favored 
than Norway maple and about as susceptible to attack as the red maple. 
Rep Mubperry (Morus rubra L.). 
Mr. Collins tested this species in the laboratory at Worcester and found it 
an unfavorable food for the gipsy-moth larve. A few specimens passed into 
the following stage, but none lived through two stages of it. No field observa- 
tions have been made. 
WHITE MULBERRY (Morus alba L.). 
White mulberry was tested in the trays at Melrose Highlands and about the 
same results were obtained as with the red species, except that it is slightly 
more favorable than the former. One male was reared from a tray started with 
second-stage larve. 
No field observations were made on this species. 
BLACK OAK (Quercus velutina Lam.). 
The oaks are among the most-favored food of the gipsy-moth larve. The 
young larve begin feeding as soon as the buds are about half open. This is a 
favored species and is eaten freely by all stages of the caterpillars and produces 
large and vigorous adults. 
