Effect of urea coated with neem formulations on root-knot and reniform nematodes in Okra

The investigations were carried out to know the effect of three commercially available neem-based formulations viz. Nimin®, U-Coat® and Modified-neem-oil® as urea coatings (@ 500 gl50kg urea) on the root-knot (Meloidogyne incognita) and reniform (Rotylenchulus reniformis) nematodes in okra. Two glasshouse experiments and a field trial were conducted in three successive years. Application of recommended doses of urea coated with Nimin® and U-Coatm® significantly reduced root-knot index as well as soil population of M. incognita and R. reniformis and increased plant growth parameters. In field trial, all the three treatments reduced the root-knot index (3.0–3.6 compared to 4.8 in check), soil populations of voot-knot (17–23%) and reniform (14–25%) nematodes compared to the check, and increased the yield/plot. Nimin® and U-Coat® urea treatments were at par and effective while increase with Modified-neem-oil® was not significantly different from the check.