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



Red Osier (Cornus stolonifera Michx.). 



In heavily infested territory some of the field observers have found slight 

 feeding during the early part of the year. This did not extend beyond small 

 holes in the leaves and notches in the edges. 



In the laboratory each successive larval stage was tried on the foliage and 

 no adults were obtained. 



Cottonwood (Popnlus deltoides Marsh.). 



Cottonwood is seldom found in this section, but was tried in the trays in 

 order to know whether it is favored in case the moth spread to territory where 

 this species is common. 



About 10 per cent of the first-stage larva? started on this foliage carried 

 through to the second stage, when they all died. At least 10 per cent of the 

 third-stage larvae started in trays reached the fifth stage, but no adults were 

 obtained. In the early stages the feeding was slight and growth accordingly 

 slow, but in the later stages feeding was more free and growth more rapid. 



No observations were made on this species in the field. 



American Cranberry (Oxycoccus macrocarpus [Ait.] Pursh). 



The larva? eat but little of the foliage of the cranberry vines, but cut off the 

 stems just above the old growth and also the stems of the flowers or newly set 

 berries. (PI. IV.) The habit of the larva? is to feed at night and remain 

 secreted during the day. By parting away the vines the larva? may be found 

 underneath, next to the cool earth, ready to come up when the sun goes down 

 to continue the feeding. Bogs that appear to be entirely free of the pest may 

 harbor great numbers that will greatly reduce the crop. 



In the trays we failed to obtain adults from larva? started in the first stage 

 on this foliage. On the bogs, however, was evidence that larva? hatched on the 

 vines had come through to the adult stage without other food. 



Bed Currant (Ribes vulgare Lam.). 



Tray experiments failed to produce any adults, although the different stages 

 were fed upon the foliage. In the early stages there was more feeding accord- 

 ing to size of larva? than in the later stages, and the larva? lived longer. 



Mr. Schaffner noted very slight feeding on this species in the field. It is 

 an unfavored food plant. 



Bald Cypress (Taxodiiun distich inn (L.) Rich.). 



Bald cypress was tried with all larval stages in the trays and only a very 

 small percentage went through to the next stajre. None reached the adult 

 stage. Feeding was very slight and there was practically no growth. It is an 

 unfavored species. 



Dangleberry (Gaylussada frondosa (L.) T. & <».). 



Larva? in the third stage started on this foliage reached the sixth stage. No 

 pupae were obtained from any stage. 



Mr. Schaffner made observations on this undershrub in the field and in one 

 instance notes a defoliation of 50 per cent, but as a rule there is but slight 

 feeding. 



