ROOT CROPS. 



63 



stages, when the insects commit so much damage, but they 

 ward off the " flies," being objectionable to them. 



Cure. — (1) " Roll and lightly harrow after 8 p.m. and 

 before 6 a.m., for this disturbs and weakens the ' fly,' and 

 stimulates the yotmg plant. Sow eight bushels per acre 



Fig. 27. — Turnip Aphis {ApMsftoris-rapa). 



•A. Male with closed wings (enlarged). 

 B. Its natural size. 

 0. Wingless female (enlarged). 

 D, Its natural size. 

 B. Flask-shaped abdomen of Aphis rapce. 



of fresh-slaked lime along the rows just as the plants are 

 appearing." (2) " Dustings of fine ashes or soot are also 

 effectual, but salt must not be used, for it injures the 

 plant and does not hurt the beetle." Dressings should 

 always be applied whilst the dew is on the plants. (3) 

 Mr. W. Gr. Mount, M.P., has eradicated the turnip fly with 

 either lime or paraffin distributed by means of a Strawso- 

 nizer (see Miss Ormerod's Common Farm Pests). 



The Turnip Aphis or Green Fly (Aphis floris- 

 rapce and Aphis rapce, Kg. 27) is allied to the bean aphis 



