Effect of date of transplanting of basmati rice cultivars and spacing on the population build up of rice-root nematode, Hirschmanniella oryzae

Population build up of rice root nematode, Hirschmanniella oryzae on basmati rice cultivars in relation to the different dates of transplanting and two spacings revealed that there was more build up of H. oryzae in crop transplanted in middle June or late July in basmati cultivars. Spacing of 15x15 cm and 20x15 cm in Basmati 370 and Pusa 615 had no effect in population build up of H. oryzae. Comparatively higher population of H. oryzae was observed in Pak Basmati followed by Basmati 370. Basmati 385 supported minimum population of H. oryzae.