ISSUE #477

477 The 2005 Crop - The Good, The Bad, The Ugly


It's great to say this year is over and the beets are out of the field and in the pile. Some growers in the Hillsboro district harvested their best crop ever while some in Drayton harvested no crop at all. Yields at Ada North, 22.9 T/A; Amenia 22.7 T/A and Nash 22.4 T/A were at or near the best ever. Very poor yields were experienced at Humboldt 9.8 T/A; McArthur 10.6 T/A and Kennedy at 11.6 T/A with only part of the contracted acres delivered. The crop was planted right on time with 98 % in the ground by May 10. Seedling emergence was good to excellent for most of the crop with replanting at just over 1 %. Then the rains came and severe flooding caused abandonment of nearly 30,000 acres. Saturated field conditions persisted for several weeks resulting in difficulty timing herbicide applications and cultivation. Moderate to severe root rots developed causing additional yield loss. The persistent warm wet conditions provided an ideal situation for Rhizomania to cause extensive yield loss. Rhizomania was particularly severe in Clay, Norman and Polk counties. It became much more severe in Traill, Grand Forks, Marshall and Walsh counties in 2005. Incidence of Rhizomania increased noticeably in Cass, Kittson and Pembina counties.

Rhizomania Management Strategies

  • Plant high resistance varieties where disease pressure is severe
  • The third crop planted after a positive Rhizomania diagnosis will suffer yield loss
  • Planting resistant varieties will slow buildup of disease inoculum
  • Long rotations, 4 years or more, noticeably slow disease buildup
  • Plant resistant varieties in fields or sections that previously have had Rhizomania
  • When resistant variety revenue per acre is equal to conventional variety revenue per acre there is no reason not to plant the resistant varieties
  • Be sure Rhizomania resistant varieties have the Aphanomyces, Fusarium and Cercospora resistance and other characteristics required on a field-by-field basis.

Sugarbeet after Soybean Minimizing the Rotation Effect

  • Plant early to maximize yield
  • Watch out for herbicide carryover if not after Roundup Ready soybean
  • Be aware Rhizoctonia is common to both soybean and sugarbeet
  • Use a starter fertilizer to maximize yield opportunity
  • Plant spring cover crop on these prone to blow soil conditions
  • Use best management practices to minimize allelopathic effects that can lower RSA by 500 to 1000 pounds per acre compared to sugarbeets after small grains.
  • Be sure to use soybean N credits