Phytopathology · 1993 · 63 citations · 0 references
Life SciencesBiologyEntomologyInsect EcologyMycologyPlant-microbe InteractionsDisease Resistance EvaluationEpidemiology Of Insect DiseasesEpidemiology Of Plant DiseasesFungal Diseases Of InsectsPhenotyping For Disease ResistancePlant Disease ResistanceMating System AnalysisMating Type DeterminationMating Type SystemsMating-type LociPathogen Resistance EvaluationPhenotypic AdaptationPhenotypic AssaysResistance Response Quantification
A total of 106 isolates of Phytophthora infestans collected in eastern Germany between 1976 and 1990 was analyzed for mating type, allozyme phenotype, and response to metalaxyl. The A2 mating type was found among isolates collected in 1980. Although an increase in the frequency of the A2 mating type has been observed since 1976, it did not increase to a frequency of 0.5, which is found in Mexico. Metalaxyl resistance was first observed among isolates collected in 1977, prior to the commercial use of the fungicide in eastern Germany. Between 1976 and 1990 the frequency of isolates resistant within a sample to metalaxyl increased from 0 to 40% []