20 BULLETIN 250, 17. S. DEPARTMENT OF AGRICULTURE. 



Rock Chestnut Oak (Quercus prinus L. ). 



This species is not common in the infested area, but wherever found the ob- 

 servers were unanimous in their reports that it is very favorable food. 



The same conclusions were drawn from the tray experiments. The larvae fed 

 freely in all stages, growth was rapid, and they attained large size. A good 

 percentage reached the adult stage. 



Dwarf Chestnut Oak {Quercus prinoides Willd.). 



No observations were made on this species in the held. 



The larvae fed freely in the laboratory during the first two stages. It then 

 became necessary to discontinue the experiments, as the specimen trees were 

 sprayed. It is undoubtedly a favored food plant. 



Buk Oak ( Quercus macrocarpa Michx. ) . 



Larvae fed freely on this foliage in all stages and grew rapidly, but all died 

 of disease by the time they reached the sixth stage. 

 No field observations were made on this species. 



Pin Oak (Quercus palustris Du Roi). 



Larvae fed on this foliage freely in all stages in the trays, especially in the 

 first stage, but none reached the adult stage on account of disease. 

 No field observations were made on this oak. 



Post Oak (Quercus stellata Wang.). 



Trays started with newly hatched larvae on this foliage produced adult moths. 

 Larvae fed freely in all stages. 



No field observations were made on this species. 



Red Oak (Quercus rxibro, L.). 



This is one of the most abundant oaks and the records of field observations 

 are voluminous. All are agreed that the larvae feed ravenously on it in all 

 stages and that large vigorous larvae are produced. This is usually one of the 

 first species to be entirely defoliated in a mixed growth. 



In the trays the larvae fed freely in all stages and good reproduction resulted. 



Scarlet Oak (Quercus coccinea Wang.). 



In most of the infested territory this oak is found to some extent and all are 

 agreed that it is eaten by larvae in all stages, but usually not quite as freely as 

 white, red, or black oak. 



Tray work shows it to be a favorite food, as a good proportion of larva went 

 through to the adult stage. 



Bear Oak (Quercus ilicifoUa Wang.). 



As a food for gipsy-moth larvae this is one of (lie most favored oaks. Not all 

 the observers had this species in their divisions, but those that did :igree as to 

 the favorability. 



In the tray work the same thing was shown, as the larvte fed freely in all 

 stages. 



