Assessment of Varietal Resistance and Two Organic Fertilizers in The Management of Southern Root-Knot Nematode in Soyabean (Glycine max)

Abstract

ABSTRACT Screenhouse experiments were conducted during 2009 and 2010 planting seasons to assess the effectiveness of resistant variety and two organic fertilizer types in the management of the southern root-knot nematode, Meloidogyne incognita population and symptoms on soyabean (Glycine max). The experiment was laid out in completely randomized design with six replications. Adapted and improved dual purpose soyabean variety, TGx 1019-2EN, with known susceptibility to M. incognita and TGx 1448-2E, resistant to M. incognita were selected for the study. Locally, commercially available ‘Neem’ and ‘Sunshine organic’ fertilizers were used. Seedlings of the test crop were raised in pots and inoculated with 5000 M. incognita eggs and allowed to grow for 60 days. Destructive plant samples were assessed for root gall symptom and severity, and bio-assays of nematode populations were done. Results show that the resistant variety was effective in controlling the population of M. incognita and the root-knot nematode symptom and gave the highest yield parameters. Neem and Sunshine organic fertilizers suppressed nematode population and symptoms on the susceptible variety compared with unfertilized plants. The two organic fertilizers were similar in the effect, but suppression and yield gain was not as effective as with the resistant variety.