Resistance of pea genotypes in relation to sporulation by Erysiphe pisi

Resistance of pea (Pisum sativum) genotypes in relation to sporulation, as represented by numbers of `conidiophores-bearing-conidia' per colony, of Erysiphe pisi on detached leaflets was studied. Many fewer conidiophores-bearing-conidia per colony were produced on highly resistant and resistant genotypes as compared with other genotypes. Moderately resistant and moderately susceptible genotypes could be separated from highly resistant to resistant and from susceptible to highly susceptible genotypes by significant differences in conidiophore counts. A general idea of resistance/susceptibility of pea genotypes may be obtained by recording sporulation on detached leaflets and this information could be useful in supplementing and/or confirming field reactions of pea genotypes. An indication of existence of pathogenic types in E. pisi was also obtained. Copyright (C) 1996 Elsevier Science Ltd.