Population behaviour of Meloidogyne incognita in soil and roots of tea in Tripura, India
AbstractSpatial and temporal variations in population density of Meloidogyne incognita in roots and rhizosphere soil of tea were studied for a period of two years (2000-2001) in a 3-year-old root-knot nematode infested and rain-fed tea plantation at Lakhilunga tea estate, West Tripura. Samples were taken at three depths (0-20, 21-40 and 41-60 cm) and at two horizontal distances (0-20 and 21-40 cm) away from the plant base. The number of second stage juveniles in the soil was low. The samples collected at 40 cm from the plant base and at 40 cm depth yielded significantly greater nematode populations and therefore can be considered as the optimal sampling zone for the development of the root-knot nematode in tea. The largest nematode population was observed in November when the soil was rather dry and rainfall was minimum in the post-monsoon season.