Bui. 100, U. S. Dept. of Agriculture 



Plate 



Fig. 1.— Three Matured Nuts of European Walnut Seedling. 

 [Middle nut natural size, other two undersized from attack by aphides.] 



Fig. 2.— Upper Side of Three Leaflets of European Walnut Seedling. 



[The central leaflet shows growth of fungus thriving upon the exudation of aphides above. 

 Two-thirds natural size.l 



