Management of Rhizomania Disease of Sugarbeets
Rhizomania is considered the most serious disease of sugarbeets worldwide. Chemical control is too costly, and partially resistant varieties have been the primary management tool. Resistant varieties, however, are susceptible to a new pathotype of the pathogen that has been found in California, Oregon and Idaho. Currently no resistance has been identified to the new pathotype, and there are no control measures available. The purpose of this project is to determine whether the planting of green manure crops can be used as a supplemental management practice for rhizomania control on sugarbeets. The effect of green manures on disease incidence and development, yield and sugar production in a sugarbeet cropping system will be investigated. Biocontrol microorganisms as possible mechanisms responsible for green manure effects will be determined.