34 



CROP PRODUCTION 



decay. The destruction of affected plants, rotation of 

 crops, and soaking the seed in a dilute solution of for- 

 malin are the most important preventive measures. 



Club-root of cabbage is due to a low form of fungus 

 — one of the so-called slime molds — that lives in the 



soil and attacks the 

 roots, causing them 

 to become abnor- 

 mally swollen. 

 Rotation of crops, 

 setting healthy 

 plants, and heavy 

 apphcations of Hme, 

 both to the land 

 and to the seed- 

 bed, are the chief 

 methods of prevent- 

 ing the disease. 



The Cauliflower 

 The Cauliflower 

 is ranked as a vari- 

 ety of the Wild 

 Cabbage, so its 

 technical name is Brassica oleracea, variety hotrytis. 

 The edible part consists of the curiously modified flower 

 clusters which form the succulent white head. 



It requires constant and careful selection of seed to 

 keep the type perfect, so that it is more important to use 

 the choicest seed with this crop than with almost any 

 other vegetable. Until recently practically all the seed 

 used in America was grown by specialists in Europe, but 



The Later Stages of the Cabbage Worm 

 Larva, Chrysalis, Butterfly 



