24 BULLETIN 250, U. S. DEPARTMENT OF AGRICULTURE. 



Sassafras (Sassafras sassafras [L.] Karst.). 



A few male moths were produced in trays started with first-stage larva? on 

 this foliage. Feeding was fairly heavy in all stages. This foliage was very 

 hard to keep in a fresh state and the trays had to be changed frequently. 



Field observers have recorded feeding in all stages and in some instances 

 defoliation. 



Service-berry (Amelanchier canadensis [L.] Medic). 



This is a very favorable food plant as the tray experiments and the observa- 

 tions in the field show. The trays produced a good percentage of males and 

 females. The larva? grew rapidly and were of large size. 



Field observers record the feeding of the larvae in all stages and in some cases 

 a complete defoliation. 



Skunk Cabbace (Snatliyema fcetida [L.] Raf.). 



Mr. Kennedy found fourth and fifth stage larvoe feeding upon this species, 

 and they continued into the sixth stage. Many of the leaves were badly eaten. 



Black Spruce (Picea mariana [Mill.] B.S.P.). 



No field observations were made on this species. 



In the trays, first-stage larva? were reared to adults on this foliage. During 

 the first stage, growth was very slow and many died of starvation, but in the 

 second stage feeding increased and continued to increase with each successive 

 stage. The larva? in the last stages were large and fed ravenously. 



Norway Spruce (Picea abies [L.] Karst.). 



From trays started with third-stage larva?, adult moths were reared. Larva? 

 in all the lower stages died before reaching the next stage. In the later stages 

 feeding was rapid, but in the first three stages the larva? fed very little and 

 growth was very slow. 



Red Spruce (Picea rubens Sargent). 



Trays started with first-stage larva? on this foliage did not produce second- 

 stage larva? ; when started with second-stage, male moths were produced only. 

 In the first stage no feeding could be found on the foliage, and in the next 

 stages feeding and growth were slow. In the last stages, however, the larva? 

 fed ravenously and growth was much faster. 



White Spruce (Picea canadensis (Mill.) B.S.P.). 



The second stage produced a small percentage of male moths, and no females 

 with larva? started in trays on this foliage. Those started in the first stage 

 died before reaching the second stage. In the later stages feeding was fairly 

 heavy and growth was rapid. It is about the same in favorability as red 

 spruce. 



Mountain Sumac (Rhus copallina L., 



This is one of the most favorable foods for all stages of the larva?. A good 

 percentage of males and females were reared from first-stage larva? in the trays 

 and growth was rapid. 



All stages have been observed feeding upon it in the field, and defoliation has 

 been noted repeatedly. 



