LEAFLET 1 



U. S. DEPARTMENT OF AGRICULTURE 



Principal Ornamental Hosts of Common Surface Mildews 



Fungus 



Erysiphe cichoracearum DC. 



Erysiphe lager stroemiae West. 



Erysiphe polygoni DC. 



Microsphaera alni (Wallr.) Wint. 



Phyllactinia corylea (Pers.) Karst. 



Podosphaera oxyacanthae. (DC.) DBy 



Sphaerotheca pannosa (Wallr.) Lev__ 



Uncinula necator (Schw.) Burr 



Uncinula salicis (DC.) Wint 



Host 



Calendula. 



Centaurea. 



Chicory. 



Chrysanthemum. 



Clematis. 



Cosmos. 



Dahlia. 



Helianthus. 



Phlox. 



Rudbeckia. 



Verbena. 



Zinnia. 



Crapemyrtle. 

 ' Alyssum. 



Aquilegia. 



Brassica. 



Calendula. 



Clematis. 



Clover. 



Dahlia. 



Delphinium. 



Dier villa. 



Lupine. 



Peony. 



Scabiosa. 



Sweetpea. 



Vetch. 



Verbena. 



Alder. 



Birch. 



Lilac. 



Lonicera. 



Oak. 



Walnut, 



Vaccinium. 



Ash. 



Beech. 



Catalpa. 



Chestnut, 



Crapemyrtle. 



Dogwood. 



Elm. 



Hawthorn. 



Hornbeam 

 {Oak. 



Amelanchier. 



Apple. 



Hawthorn. 



Pear. 



Persimmon. 



Plum. 



Spirea. 

 /Peach. 

 \Rose. 

 fAmpelopsis. 

 (Grape. 

 /Poplar. 

 1 Willow. 



U.S. GOVERNMENT PRINTING OFFICE: 1940 



For sale by the Superintendent of Documents, Washington, D. C. - - - - Price 5 cents 



