Vegetable and Field Crops 



207 



the field. The neck of the onion, where the top has been cut 

 off, is coated with a fuzzy, pale brown or gray mold, and later 



Fig. 110. — Black-spot showing variation. Original. 



this area bears few or many black sclerotia. The mold oc- 

 curs also in water-soaked spots on leaves and seed heads. 



Diseased bulbs should never be set out. All diseased refuse 

 should be destroyed. The crop must be thoroughly cured 

 and dry before storage. 



