Ribosomal DNA variation was used to study evolutionary relationships among five fungal-like protoctistan Phytophthora species. On the basis of morphological and ecological characteristics, four of these species--P. palmivora, P. megakarya, P. capsici, and P. citrophthora--were once thought to be related. Variation within a species was extensively studied in a fifth, outgroup species--P. cinnamo...

ABSTRACT The potential for outcrossing, occurrence of oospores, and inheritance of mefenoxam sensitivity was assessed in naturally occurring populations of Phytophthora capsici. Between 1997 and 1998, 14 farms were sampled, with 473 isolates recovered from cucurbit hosts and 30 from bell pepper. The A1 and A2 compatibility types were recovered in a roughly 1:1 ratio in 8 of 14 farms with sample...

Phytophthora capsici is a pathogen on several economically important crops including pepper. The fungus attacks the roots, stems, leaves and fruit of the plant. Experiments were conducted to determine environmental conditions that may affect infection of pepper fruit by zoospores of P. capsici. Two techniques were used to inoculate the mature green pepper fruit. First, the blossom end of the fr...

BACKGROUND Oospores are the most persistent propagules of Phytophthora capsici. The viability of oospores is determined by staining methods such as the tetrazolium bromide (MTT) test. OBJECTIVES The aim was to assess the MTT test and a plasmolysis method for their utility in determining viability of oospores of P. capsici. METHODS For either procedure the reactions of non-treated (viable) a...