HARM DONE BY WEEDS n 



common insect and fungoid pests which are spread by 

 means of weeds acting as host plants : 



WEED " HOST." INSECT. 



C Turnip Flea Beetle or " Fly " 



Charlock (Sinapis arvensis) andj (Phyllotreta(PIaltica]nemorum\ 

 similar Crucifers . . .1 Cabbage and Turnip Gall Weevil 



\ (Ceutnrhvnr.hus sulcicnllis}. 



Goosefoot (Chenopodium album)\ 

 Thistles (Cnicus spp.) . 

 Sow Thistle (Sonchus) . . r 

 Dandelion (Taraxacum] and ap- 

 parently Docks (Rumex) .' 



(Ceutorhynchus sulcicollis], 

 Mangold Fly (Pegomyia betce). 



Charlock and other Crucifers . ) Diamond-back Moth (Plutella 

 Prickly Saltwort (Salsola Kali) . \ maculipennis). 



Thistles, and the Cotton Thistle 



(Onopordon Acanthiuni) . 



Hops, Yorkshire Fog, Poa annua, 

 "' Daisy, Shepherd's Purse, Spur- 

 rey, Buttercup, Cornflower, Sow 1 Stem Eelworm ( Tylenchus devas- 

 Thistle, Black Bindweed (Poly- f tatrix} (not an insect). 

 gonum Convolvulus), and Plan- 

 tain J 



N fe ha J eS vS" ban ?.'.. H 5 d ?f) Colorado Beetle (Dorvthora de- 





Shepherd's Purse, Winter Cress, > Cabbage Root Fly (Phorbia bras- 

 Hedge Mustard . . . $ sicce). 



Various Grasses .... Frit Fly (Oscinis frif). 



Docks, Thistles, Burdock . . j Gh / ^ / j r Uer M th 



WEED " HOST." FUNGUS. 



Charlock and other Crucifers . { Finge 5: a " d " tOe , f ^"Vfr 8 ( P/aS ~ 



( modtophora brassicce Won). . 



,, ,, . Peronosporaparasitica De Bary. 



