Submitted to: Proceedings of the Texas Pepper Conference
Publication Type: Proceedings
Publication Acceptance Date: 11/5/2007
Publication Date: 11/7/2007
Citation: Thies, J.A., Dickson, D.W., Hassell, R., Rosskopf, E.N., Mendes, M. 2007. Host resistance and soil treatments for managing Pythium root rot and southern root-knot nematode in pepper. Proceedings of the Texas Pepper Conference, November 7-9, 2007. Weslaco, TX. 11:9-10.
Technical Abstract: Five pepper (Capsicum annuum) genotypes differing in reactions to Phytophthora capsici and southern root-knot nematode (Meloidogyne incognita) were studied in combination with four soil treatments for managing Pythium root rot and southern root-knot nematode in field trials in Charleston, SC and Citra, FL. Pepper genotypes were ‘Charleston Belle’, a root-knot nematode resistant bell pepper, and its susceptible recurrent parent, ‘Keystone Resistant Giant’; CM 334, a serrano-type pepper resistant to both root-knot nematode and P. capsici; ‘Paladin’, a bell pepper moderately resistant to P. capsici; and ‘Jupiter’, a bell pepper highly susceptible to P. capsici. Soil treatments were pre-plant fumigation with methyl bromide (98:2), BioPhos (dipotassium phosphonate/phosphate, drip application), Ridomil Gold EC (mefenoxam, drip application), and an untreated control. All pepper genotypes performed well in methyl bromide treated plots. Generally, plants exhibited less root rot and associated wilting and chlorosis in the BioPhos and Ridomil Gold EC treated plots, even though significant differences in disease indices were not detected compared to the untreated control. CM 334 exhibited high resistance to root-knot nematodes, low root necrosis indices, and low area under the disease progress curve (AUDPC) for wilting and chlorosis associated with Pythium root rot. ‘Charleston Belle’ exhibited high resistance to root-knot nematodes, but was susceptible to Pythium root rot. ‘Paladin’, ‘Keystone Resistant Giant’, and ‘Jupiter’ were susceptible to root-knot nematodes and Pythium root rot.