FOOD PLANTS OF THE GIPSY MOTH IN AMERICA. 15 
HAZELNUT (Corylus americana Walt.). 
This is a favored food plant for all stages of the larve, although feeding is 
heavier during the first four stages. 
In the laboratories the feeding in trays was general in all stages and male 
and female moths were reared from larve started in the first stage. 
BEAKED HAZELNUT (Corylus rostrata Ait.). 
Not as common as the above species. Field observations same as for 
C. americana. 
Laboratory experiments had to be discontinued after the larve reached the 
third stage because the shrubs were sprayed with poison. 
HeMuock (7suga canadensis [L.] Carr.) 
This evergreen is capable of Supporting life in all stages of the gipsy-moth 
larve. At the Worcester laboratory, Mr. Collins reared 2 males and 1 female 
from the two trays of first-stage caterpillars. At the Melrose Highlands 
laboratory no adults were reared. 
The field observers note feeding in all stages on the foliage, but in the first 
stage it is the new growth only. The feeding increases in intensity with each 
successive stage. In the field few adults develop when this tree is the exclusive 
diet of the gipsy-moth larve. (PI. V.) 
BITTERNUT Hickory (Hicoria cordiformis [Wang.] Britton). 
No field observations were made on this hickory. 
In the trays the larvee fed quite freely in the first three stages, but the foliage 
appeared somewhat distasteful to them in all stages. 
The tree will doubtless sustain the caterpillars through life, but is not a 
favored food plant. 
MockerNnut Hicxory (Hicoria alba [L.] Britton). 
This seems to be the most favored species of the hickories. Mr. Shinkwin 
reports nearly total defoliation of a few trees. Feeding is most noticeable in 
the early stages. | ; 
In the trays, first-stage larve were reared to the fifth stage only. 
In heavy infestations, in a mixed growth, this tree may be severely defoliated. 
PigNut Hickory (Hicoria glabra [Mill.] Britton). 
Pignut hickory has been watched by all the observers and slight feeding upon 
it has been noted in all stages. All are of the opinion that it is an unfavorable 
food plant. The first-stage larve begin feeding upon the bud scales and follow 
up by eating holes in the new unfolding leaves. 
In the trays at Melrose Highlands started with first-stage larve, eile moths 
were obtained. At no time was the feeding free, and growth was very slow. 
SHAGBARK Hickory (Hicoria ovata [Mill.] Britton). 
Shagbark hickory is eaten by the gipsy-moth larve less than the other 
~ hickories. The field observers report considerable feeding on the bud scales and 
after these drop the feeding diminishes. All stages have been reported feeding 
upon it sparingly. 
