The spores may become airborne and spread to other plants and fields. Overwintering spores are produced in decaying crop debris and released into the soil. Disease Control . The strategy for white rust control involves reducing the pathogen population in the field. This may be accomplished through procedures such as rotation out of cruciferous crops, fall plowing, and good weed control.
Protective fungicides are available for use on only a few crops.
White rust-resistant varieties are not available. Boron Deficiency Boron deficiency is a nutritional disorder that occurs sporadically on broccoli grown in Indiana. The first symptom is a slight brown discoloration at some spot on the head. The brown spots can expand to cover the entire head and develop an odorous soft rot. A close internal inspection of the stem will show a cracked and brown or black cavity.