TURNIPS. 



TURNir APHIS. 



177 



Disturbing the surface of the ground so as to throw out the 

 eggs, and in gardens clearing away all the different rubbish 

 amongst which they shelter, also strewing Cabbage leaves to 

 attract them, and clearing the Slugs from beneath these every 

 morning, are well-known remedies. 



TURNIPS. 



Turnip Aphis (Green Fly). Aphis rajm, A. J^oris-rajni:, Cnvils ; 

 Il/tdiKilosiphuiii dianthi, Schrauk. 



1 — 4, Apliis Jloris-rapce ; 5 — 8, A. rapce, nat. size and magnified. 



This Aphis is common in the summer on many kinds of 

 plants, and is especially hurtful to Turnips, Swedes, and 

 Potatoes. It is chiefly to be found on the under side of the 

 leaves, but sometimes occurs in such numbers as to smother 

 the plants ; and the vast swarms of Green Fly which at times 

 fill the air, as in the autimm of 1834 and in 1868, are believed 

 to have been of this species. 



The Aphis is very variable in appearance ; the wingless 

 viviparous female is of some shade of green or yellow, but 

 often of an ochreous-red in autumn ; the winged viviparous 

 female is for the most part black, with reddish yellow abdomen, 



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