Abstract Annual and herbaceous perennial ornamental bedding plants are popular, high value crops in the southeastern United States. However, many of these subject to root or crown rot caused by Phytophthora species. In North Carolina, nicotianae Breda de Haan, drechsleri Tucker, cryptogea Pethybr. & Laff., and/or tropicalis Aragakia J.Y. Uchida cause this disease greenhouse production syste...

Phylogenetic relationships among Phytophthora species were investigated by sequence analysis of the internal transcribed spacer region I of the ribosomal DNA repeat unit. The extensive collection of isolates included taxa from all six morphological groups recognized by Waterhouse (1963) including molecular groups previously identified using isozymes and mtDNA restriction fragment length polymor...

Trichoderma species are among important antagonists of plant pathogenic fungi. The main purpose of this study was to evaluate the biocontrol potential of native Trichoderma spp. isolates from sugar beet fields against Phytophthora drechsleri and P. cryptogea, the causal agents of Phytophthora root rot of sugar beet. During 2007–08, 85 isolates of Trichoderma spp. from sugar beet fields in eight...