284 



JOURNAL oi' A(i!;l('ri/ri KM-: >'F I". R. 



parasitic and predaceous enemies, occasionally becomes destructive. 

 It appears at such times in large colonies on the cabbage leaves, suck- 

 ing the plant juices and distorting the leaves. 



The. aphid is dusky green in color and appears in winged and 

 wingless forms. 



Control. — These lice may be easily destroyed l)y spraying them 

 witJ! a nicotine sulphate and soap solution. Directions for making 

 this spray may be found on page 268. 



OTIIKR CABBAGE I'ESTS. 



Agromyza sp., mines the leaves ; flea-beetles (see General Feeders, 



Pig. 38. — The Southern White Cabbage Butterfly {Pontia Monustc) . 

 Male butterfly. Much enlarged. (U. S. Bureau of Entomology.) 



page 271) ; grasslioppers (see General Feeders, page 272) ; nema- 

 todes (see General Feeders, page 274). 



CAREOTS. 



FLEA-BEETiiE (Syslena hasalis). 



This tlca-bcetle is a very general feeder on truck crops. It is 

 very fond of the tender leaves of the carrot and may always be found, 

 feeding on it in large numbers. 



