27 



brown and dry. It is believed that flea-beetles are responsible to some 

 extent for the spread of the disease. 



Treatment : Spray with Bordeaux and Paris green when the plants 

 are three or four inches high, and repeat every two weeks through June 

 and July. This treatment will control both the fungus and the flea- 

 beetles. 



Four-lined Leaf Bug. (PsecilocapsusMneatus, Fab), a. adult ; b. 



Lugger. Fggs after Slingerland. 



c. immature. 



Dry Rot (Fusarium oxysporum) : This disease produces a wilt of 

 the stalks, and a rot of the tuber, characterized by a blackening of the 

 ring of fibres and an end-rot. These injuries usually follow the blight; 

 and the rotting is frequently in market potatoes, which may appear quite 

 sound on the outside, but on cutting them open show black or brown 

 spots or parts of rings. 



Treatment : By spraying to prevent Blight, and selecting seed pota- 

 toes carefully, the injuries may be reduced. 



Wet Rot (Bacillus sp.) : A common bacterial disease of potatoes, 

 producing soft rot. 



Radish. 



(Insects.) 



Radish-Maggot (Phorbia brassicce) : These are the same maggots 

 that work' in Cabbage roots, and for further information concerning 

 appearance and life-history of this insect, see insects affecting the 

 cabbage. 



Remedies : Sprinkle carbolic acid emulsion solution along the rows 

 about once a week ; light frames, two or three feet high, enclosed on all 

 sides with cheese cloth, placed over the beds ; dust white hellebore along 

 the rows once a week ; slight applications of nitrate of soda between the 

 rows. (See Onion Maggot.) 



