Evaluation of soybean (Glycinemax L. Merrill) varieties for resistance to rootknot nematode (Meloidogyne spp.) under field conditions

Field experiment was conducted to evaluate the resistance of fourteen varieties of soybean to Meloidogyne spp. infection at Umudike. Result obtained indicated that there were no significant differences on plant height, mean number of leaves per plant, on the varieties used. Only mean number of nodules (3.3) per plant, mean flowering dates (44 DAP) exhibited significant differences. Varieties TGX1789-7F, TGX1681-3F, TGX1440-1E, TGX1805- 33F, NCRISOY-6 and NCRISOY-1 were moderately susceptible. Varieties TGX1485-1D, TGX1805-31F, TGX1843- 6E and Cameroon late were observed to be resistant to the nematode infection. The resistant varieties recorded for nematode population (2433) at planting, nematode population (2566) at mid planting periods only. There was no significant difference on the grain yield. Grain weight for each treatments and variety showed TGX1019-2EN as having the lowest yield (0.56kg). Variety TGX1807-19F maintained a higher yield (1.42kg) and resistance to nematode attack, while varieties TGX1805-33F and NCRISOY-1 had high nematode populations and galls (3.3, 3.7) respectively. However, these varieties yielded the highest grain by weight than other varieties ie 0.94kg and 1.06kg respectively.

Author(s): Ibiam BUN, Ononuju CC, Onyenobi FI, Okorocha AD and Ikwunagu EA

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