Site selection Grow asparagus in fields that have never grown the crop before. Replace the suspension in the clean tank when it is discolored by soil. Drain crowns, and plant as soon as possible. These are not currently viable management options. 47 Phytophthora spear rot , Phytophthora spp.
Infected spears show gray-beige to brown lesions slightly above or just below the soil line.
The decay is odorless unless invaded by saprophytic bacteria. No thresholds have been established. No resistant varieties are available. This is a problem in low or poorly drained areas. These are not currently viable management options.