Journal of Plant Pathology Archive

Abstract:

Seven strains of Phytophthora nicotianae were isolated from pepper plants (Capsicum annuum) showing collar and root rot in northwest Spain and were identified using standard taxonomic criteria. The pathogenic behaviour of the isolates was studied in Capsicum annuum under greenhouse and growth chamber conditions in comparison with that of Phytophthora capsici. Differences between isolates of the two species and great variation within the strains of P. nicotianae were observed. The genetic compatibility of these strains was studied and the importance of some taxonomic criteria was considered. P. capsici isolates were all A1 while those of P. nicotianae had the A2 compatibility type. Criteria for distinguishing the two species are discussed.