30 BULLETIN 250, U. S. DEPARTMENT OF AGRICULTURE. 
YELLOW BIRCH AND HEMLOCK. 
Larve fed on the birch freely in the first four stages and more moderately 
in the latter stages. No feeding occurred on hemlock in the first and second 
stages. It was slight in the third and continued light in the remaining stages. 
Larve grew rather slowly and were of small size and a few changed to 
adults. 
YELLOW BIRCH AND RED MAPLE. 
Larve fed more freely on birch than on maple, and the same proportionate 
feeding was maintained throughout the experiment. They were of small size 
and were badly attacked by disease. A Small number reached the adult stage. 
YELLOW BircH AND SUGAR MAPLE. 
The larve fed moderately on both food plants, with a slight preference for 
the birch at times. They grew slowly and were of moderate size. A few males 
and females were obtained. 
YELLOW BircH AND WITCH-HAZEL. 
There was moderate feeding on both these food plants, but at times some 
preference was shown for witch-hazel. Growth was rather slow and the larveze 
attained moderate size. A few males resulted. 
Low BLUBERRY AND WHITE PINE. 
This is the most unfavorable of the blueberries. Feeding was very light in 
the early stages and increased later, but at no time was this plant eaten freely. 
There was no feeding -on pine in the first three stages. It was light in the 
fourth and increased in the later stages. Larve grew slowly in the early 
stages, but much more rapidly later, and reached medium size. Only maies 
were obtained. 
In a single location in the field the blueberry was very slightly eaten by 
first-stage larvee, but no feeding was noted by the later stages. The infestation 
was light and no defoliation resulted to either the blueberry or pine. 
TALL BLUEBERRY AND WHITE PINE. 
The feeding on blueberry by the first and second stage was light and there 
was great variation in the rapidity of growth. In the remaining stages feeding 
was free. Pine was not eaten in the first two stages. In the other stages it 
was fed upon slightly, but not freely. The larve grew quite rapidly and reached 
medium size. Adults of both sexes were obtained. 
BLUEBERRY AND WHITE PINE. 
This blueberry is the most favored of the blueberries, and larve fed freely 
upon it in all stages.. Pine was not eaten at all in the first two stages, but 
feeding increased in the later stages, when it was often eaten from choice. 
The larve grew rapidly and attained average size, and males and females 
developed. 
Field reports show nearly complete stripping of the blueberry, but almost 
no injury being done to the pines. 
