Oat, Wheat, and Sorghum Genotype Reactions to Meloidogyne incognita and Meloidogyne javanica.
Keywords:crop rotation, management, resistance, root-knot nematodes
AbstractMeloidogyne spp. are the most economically importan t species of plant-pathogenic nematode s. Plant resistance and crop rotation are the main nematode management methods. Thus, the objective was to evaluate the resi stance of seven wheat genotypes, five oat genotypes, ten sorghum hybrids, and thr ee sorghum–sudangrass genotypes to Meloidogyne incognita and Meloidogyne javanica .Thecropswere sowed in pots with an autoclaved substrate. A single plant/pot was le ft after thinning. The soil was infested with 5,000 eggs of the studied nematodes. Tomato (cv. Rutgers) plants were used as the standard for nematode susceptibility. The evaluations were conducted 60 d after inoculation. Gall and egg-mass indexes were obtained according to a 0–5 scale. Plants with a reproduction factor higher than 1.0 were classified as susceptible (S) and lower than 1.0 as re sistant (R). Wheat and oat genotypes did not allow M. incognita and M. javanica reproduction, proving resistance to these organis ms. Sorghum genotypes had different reactions to M. incognita and M. javanica .The tomato (cv. Rutgers) plants demonstrated th e viability of the nematode inoculum for the three crops. The wheat and oat genotypes and the sorghum hybrids ‘BRS-610’, ‘BRS-800’, and ‘30 7.343’ can be used in crop rotation systems for M. incognita and M. javanica management.
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