676 



WEED FLORA OF IOWA 



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Fig. 524. Impurities found in Red Clover: 1, Bull Thistle; 2, Canada Thistle; 

 3, Green Foxtail (Setaria viridis) ; 4, common Plantain (Plantago rugelii) ', 

 5, Peppergrass (also found in Timothy); 6, Chicory; 7, Pigeon Grass 

 (Setaria glauca) ; 8, Crabgrass (Digitaria sanguinalis) ; 9, Old Witch Grass; 

 10, Timothy; 11, Wild Carrot; 12, Pigweed (Amaranthus retroflexus) ; 13, 

 Smartweed (Polygonum persicaria) ; 14, Lamb's quarters; 15, Dropseed 

 Grass (Muhlenoergia). 



(Drawings by Charlotte M. King.) 



Weed "host. : 



Insect. 



Gharlock (Sinapis arvensis) 

 I similar Crucifers 



and 



Goosefoot (Chenopodium album) 

 Thistles (Cirsium sp) 

 Sow Thistle (Sonchus) 

 Dandelion (Taraxacum) and appar- 

 ently Docks (Rumex) 



Turnip Flea Beetle or "Fly" (Phyl- 

 lotreta (Haltica) nemorum) 



Cabbage and Turnip Gall Weevil 

 (Ceutorhynchus sulcicollis) 



Mangold Fly (Pegomyia betae) 



