Rhizomania

Beet Necrotic Yellow Vein

 

Identification

  • Rhizomania, cause by Beet necrotic yellow vein virus, is one of the most destructive beet diseases
  • Can cause a 100% loss in an infected field
  • The disease is transmitted and carried by a fungus
  • The fungus is carried by the wind, equipment, and tail water
  • Excessive water and poor soil structure influences the development and propagation of the fungus

 

Detection

  • Stunting of the root
  • Large number of small lateral roots growing out of the main tap root
  • The beet will have a heavy bearded look
  • The root may be small with dark veins or totally rotted off
  • The vascular rings are visibly darkened
  • Leaves will be bright in color and extend upright from an abnormally large crown
  • Leaves may wilt and become flabby
  • Leaves may show yellowing veins

 

Beet Damage

  • Infection blocks moisture and nutrients from entering the beet

 

Control

  • Resistant varieties
  • Avoid planting in infected fields
  • Long crop rotations (not an option since the vector can remain dormant, yet viable for up to 25 years in the soil)
  • Early planting to have a larger canopy developed before warm temperatures arrive