214 Diseases of Truck Crops 



Control. Burning of all infected trash and crop 

 rotation are the best effective remedies. 

 Root Rot, see Beet p. 122, 128. 

 Root Knot (fig. 35 f), see Beet p. 129. 



DISEASES OF THE TURNIP {Brassica Rapa) 



Club Rqot, see Cabbage, p. 186. 



Black Rot 



Caused by Pseudomonas campestris (Pam.) Ew. Sm. 



Black rot in turnips is apparently confined to the 

 roots. Infected plants may live a long time, and 

 show no symptoms on the leaves. The roots pf 

 such plants, however, are stunted, abnormal in shape, 

 and very narrow. The interior tissue is dry rotted 

 and blackened, emitting a characteristic strong odor. 

 For further description of the black rot, see p. 317. 



Scab, see Beet, p. 120, and Potato p. 317. 



White Rust, see Radish, p. 211. 



Downy Mildew, see Cabbage p. 194. 



Drop (fig. 36 g), see dABBAGE, p. 194. 



Anthracnose 



Caused by Colletotrichum, Higginsianum Sacc. 



Anthracnose is a new disease whidi has recently 

 been studied and described by Higgins' in Georgia. 



• Higgins, B. B., U. S. Dept. of Agr., Jour, of Agr. Research, lo: 

 157-161, 1917. 



