Nematicidal influence of P.tuberreguim and neem extract on the incidence of root-knot nematode on hausa potato (Solenostemon rotundifolius Poir).
Efficacy of Pleurotus tuberregium, Neem-leaf ash, carbofuram and combination of the three above were tested in the control of root-knot nematode (Meloidogyne incognita) on Hausa potato. In the green house, twenty-five polythene bags were filled with 10kg of steam-sterilized sandy loam soil and Hausa potato seedlings were planted in each of them. Four weeks after planting 5000 eggs of (Meloidogyne incognita) were inoculated round the plants in each of the bag. The treatments which included Pleurotus tuberregium, Neem-leaf ash, Carbofuran (a synthetic nematicide), and a combination of the three treatments above as a combined approach treatment were applied into the bags around the plants to ascertain the nematicidal influence of each. A control plot where nematode eggs were not inoculated and no treatment application was maintained and observed. Influence of these treatment were further observed in the field which is naturally infested with nematode (Meloidogyne incognita.) The field study was laid out in a Randomized Complete Block Design (RCBD) replicated five times. Both the green house study and the field study shows that all the materials used as treatments in this study have nematicidal influence as they significantly (P=0.05) reduced nematode population and their damaging effects. Combined approach treatment (i.e. P. tuberregium, plus Neem-leaf ash, plus carbofuran) gave better result than the single treatments.
Keywords: Root-Knot nematode, control, Hausa potato.