The Occurrence, Characteristics, Distribution, Genetics, and Control of a Metalaxyl-resistant Pathotype of Bremia lactucae in the United Kingdom. I. R. Crute, Principal Scientific Officer, Plant Pathology Section, National Vegetable Research Station, Wellesbourne, Warwick, England, CV35 9EF. Plant Dis. 71:763. Copyright 1987 American Phytopathological Society. DOI: 10.1094/PD-71-763.