Relationship of Age of Plants and Resistance to a Severe Isolate of the Beet Curly Top Virus

Abstract

DUFFUS, J. E., and I. 0. SKOYEN. 1977. Relationship of age of plants and resistance to a severe isolate of the beet curly top virus. Phytopathology 67: 151-154. Strains of the curly top virus capable of causing after more than 40% of the growing period had elapsed. Both appreciable damage to resistant cultivars of sugar beet are root yield and sucrose content were significantly reduced. found throughout the western United States. However, little Disease resistance appears to be associated with differences knowledge of the extent of the damage induced by these in incubation period rather than differences in the abilities of isolates was known. Field trials on sugar beets have indicated resistant cultivars to recover from the effects of virus that current strains of the curly top virus caused serious infection. losses, even when inoculated as late as 10 wk after seeding or Beet curly top virtually destroyed the sugar beet