18 BULLETIN" 250, U. S. DEPAETMENT OF AGRICULTURE. 



American Linden ( Tilia americana L. ) . 



All field observers agree in calling this a favorable food for the gipsy-moth 

 larvse. It is eaten freely by all stages and is especially favored during the first 

 three larval stages. 



In the trays a fair percentage of adults were obtained from first-stage larvae. 



European Linden (Tilia sp. 1 L.). 



Mr. Schaffner notes considerable feeding on this species by second and third 

 stage larvse. 



In the trays this species did not seem to be as favored as the preceding one ; 

 the larvse died rapidly and none pupated, although several reached the fifth 

 stage. 



Black Locust (RoMnia pseudoacacia L.). 



Slight feeding by all stages of the gipsy -moth larvse has been observed in the 

 field in mixed growth, where the infestation was bad. 



In the trays the larvse fed very sparingly and died rapidly. None before the 

 third stage were carried to the adult stage, and all those reared were male 

 moths. It is an unfavored species. 



Honey Locust (Gleditsia triacanthos L.). 



Results of the tray work show that this species ranks the same as the 

 preceding. 

 No observations have been made in the field on honey locust. 



Pepper-bush (Xolisma Uffwstrina [L.] Britton). 



Slight feeding by gipsy-moth larvse in all stages has been observed on this 

 species in the field. 



In the trays, feeding was very slow and little or no growth resulted. It is 

 an unfavored species. 



Mountain Maple (Acer spicatum Lam.). 



No field observations have been made on this maple. 



In the trays the first-stage larvse fed freely, but after passing into the 



second stage feeding was much less, and none developed beyond the third stage. 



Very little feeding occurred in the later stages and no adults were obtained. 



Norway Maple (Acer platanoides L.). 



Adults, both male and female, were obtained from the trays started with 

 first-stage larvse on this foliage. The larvse fed freely, especially in the later 

 stages, and grew to good size. 



No field observations were made on this maple. 



Norway maple and the box elder are the most favored species of the maples. 

 They are not as freely eaten, however, as many other food plants. 



1 T. platyphyllos and T. vulgaris are the lindens usually included by nurserymen as 

 T. europiea, hence the designation Tilia up. Is adopted in the absence of specific determi- 

 nation. 



