Use fixed or neutral coppers. Remove fungicide residues by washing. Consult seed catalogs for current information on resistant varieties. Yellowing and wilting of young center leaves that later turn brown and die. Control aphid vectors with appropriate insecticide.
Some varieties have tolerance to the virus.
Consult seed catalogs for current information on varieties. Consult the Plant Disease Clinic for more information on serological testing provided by Dr. Om Sehgal. Albugo occidentalis 1. White blister-like spots on leaves, usually on upper surfaces. May be banded over the row, pre-plant incorporated or injected with liquid fertilizer.