Evolution of Herbicide Resistance in Senecio vulgaris: Variation in Susceptibility to Simazine Between and Within Populations

Publisher Website
Google Scholar
Abstract
Inter-population variation in susceptibility to simazine in S. vulgaris was investigated in 46 different populations collected from several different fruit farming locations in England [UK). Significant population differences occurred in susceptibility to simazine, indicating a genetic basis for variation in susceptibility. There was a positive, linear relationship between percentage survival of a population and the number of consecutive years of simazine application indicating the possibility that natural selection had occurred. Intra-population variation in susceptibility to simazine was investigated in 1 population orginating from an apple orchard in Suffolk, and a selfing series procedure was used to obtain the genetic and environmental components of variance and an estimate of broad sense heritability. The latter was low.