20 



CABBAGE. 



is held ill the hand, so as to induce it to loosen hold ; but the surest 

 way to reduce the pest without damage to the fohage is to destroy it, 

 whilst still in larval or grub state, by some of the various measures 

 suggested. 



CABBAGE. 



Cabbage Aphis; Turnip-blossom Plant-louse. Aphis hrnssica;, 

 Linn. ; Aphis jioris-ro.pii: , Curtis. 



Aphis bkassic^. 

 1 and 2, male Aphis ; 3 and 4, wingless female (nat. size and mag.). 



About the 9th of August specimens of an infestation which was 

 then doing much harm to his Kale seed plants, was forwarded to me 

 for identification by Mr. John Moss, of Feering, Kelvedon, Essex. 

 This proved to be of the kind of Aphis, or Plant-louse, commonly 

 known as the Cabbage Aphis, which is not only to be found in summer 

 in great quantities on the leafage of Cabbage, or plants of the Cabbage 

 kind, but also amongst the flowers. 



Under the name of the " Turnip-flower Plant-louse," it was de- 

 scribed by Curtis as being noticed by him in multitudes " amongst the 

 short flower- stalks of the early white Turnip when a few only of the 

 flowers are open. They were of various sizes, but all apterous " (wing- 

 less) "at that period; by the middle of August, however, they had 

 increased to very large companies, with a few winged specimens. This 

 species is readily distinguished by its white dusty appearance with 

 which both sexes are thinly coated, as well as by the short, conical, 

 and black tubes." 



At the present day {i-ide Buckton's ' Brit. Aphides,' vol. ii., p. 33) 

 this species is considered to be the same as the Aphis brassicat, or 

 Cabbage Plant-louse. Like most other kinds of Aphides, these are to 



