|Thies, J. - USDA, ARS, VEGETABLE RES|
Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: April 1, 2005
Publication Date: June 1, 2005
Citation: Yandoc, C.B., Rosskopf, E.N., Thies, J. 2005. Reaction of root-knot nematode-resistant peppers to Phytophthora capsici. Phytopathology. 95:S115. Technical Abstract: Seven root-knot nematode resistant pepper cultivars and cultigens were evaluated for resistance to Phytophthora capsici in the greenhouse. Two bell pepper cultivars, Charleston Belle and Carolina Wonder; two cayenne cultivars, Carolina Cayenne and Charleston Hot; and three Scotch Bonnet-type cultigens, PA-353, PA-398, and PA-426 were tested using three inoculum levels of P. capsici (0, 2.0 x 104 and 4.0 x 104 zoospores/plant). The bell cultivars Capistrano and Enterprise (susceptible to P. capsici) and Aristotle (resistant) were included as reference controls. Disease resistance was measured by computing the area under the disease progress curve (audpc), which was based on the disease severity ratings at 7 and 14 days after inoculation. The disease severity rating scale ranged from 0 (no disease) to 5 (dead). ‘Aristotle’ was not infected at either inoculum level. According to the audpc, the Scotch Bonnet-type cultigens PA-398 and PA-426 were the most resistant genotypes at the lower inoculum level while PA-353 was the most resistant at the higher inoculum level. However, the disease severity levels of PA-353, PA-398, and PA-426, were higher (P=0.05) than the resistant control Aristotle.