Apple Aphids and Work. 



Figs. 30-33 Green apple-aphis; 30, Winter eggs; 31, Winged form; 

 32, Wingless form; 33 , Leaf curl caused by Apple-aphis; 34, Woolly 

 aphid, wingless form; 35, Knotty root caused by Woolly aphid. 

 (Figs. 30-33 after Quaintance; 34, 35 after Marlatt). 



