?Elntb?rsitp of fftamt. 



ORONO 



BULLETIN 256 



NOVEMBER, 1916 



ELM LEAF ROSETTE AND WOOLLY APHID OF 

 THE APPLE. 



CONTENTS. 



PAGE 



Habits and General Discussion 330 



Economic Status 336 



Life Cycle of Woolly Aphid of Apple 338 



Structure Key 339 



Habitat Key 340 



Preventive and Remedial Measures 341 



