4 BULLETIN 90, U. S. DEPARTMENT OF AGRICULTURE. 



DISTRIBUTION. 



The rose aphis is distributed over the entire United States, having 

 been recorded from Massachusetts, New Jerse} , Illinois, Iowa, Minne- 

 sota, Colorado, and California. It also occurs in Europe, from which 

 country it was first described. 



The writer has collected it in southern California on all the 

 commoner varieties of roses growing outdoors and has also taken it, 

 in 1913, in Connecticut, Maryland, the District of Columbia, and 

 Virginia. 



Fig. 2. — The small green rose aphis ( Myzus rosarum): a, Winged viviparous female; 6, wingless viviparous 

 female; 1, 2, antcnnal articles of winged female; S, cornicle of same; 4> style of same; 6, third antenna! 

 article of same; 6', style of wingless female; 7, 9, front and antenna of same; 10, cornicle of same; S, process 

 of sixth antenna! article of same. Greatly enlarged. (After Essig.) 



CHARACTER OF INJURY. 



This insect, like all aphides or plant-lice, obtains its food by suction. 

 The slender beak with which it is furnished is inserted into the plant 

 attacked, and through this the plant juices are taken up. The rose 

 aphis in feeding chooses the tender and growing shoots and flower 

 buds or the young unfolding leaves, and by feeding in large numbers 

 checks the growth, the leaves and flowers being curled or distorted 

 and prevented from attaining their perfect form. (Pis. I, II.) 



