1 86 Diseases of Truck Crops 



The total 1909 area in horseradish was estimated at 

 1475 acres, and the total crop valued at $233,885. 

 The crop is grown mostly in North Dakota, Pennsyl- 

 vania, New York, New Jersey, and Illinois. 



The total 1909 area in kale was estimated at 1495 

 acres, and the total crop valued at $146,010. The 

 crop is principally grown in Virginia, Kentucky, 

 Maryland, and New York. 



The total 1909 area devoted to radish was esti- 

 mated at 2269 acres, and the total crop valued at 

 $293,062. The crop is grown in the following States, 

 ranking in order according to acreage: New York, 

 Alabama, Virginia, Illinois, Mississippi, Louisiana, 

 Missouri, and Texas. 



DISEASES OF CABBAGE {Brassica oleracea) 



The cabbage, although a hardy plant, is neverthe- 

 less subject to numerous diseases. Disease may re- 

 duce the profits of the crop by fifty per cent., or even 

 mean total failure. 



Club Root 



Caused by Plasmodiophora brassica Wor. 



Club root is a field disease only. Few plant dis- 

 eases are as cosmopolitan as this trouble. It is 

 found in many of the European countries, and in 

 Australia, New Zealand, and in the United States. 

 The loss from club root ranges from forty to seventy 



