Assessment of avoidable yield losses in Rajmash, Phaseolus vulgaris due to root-knot nematode, Meloidogyne incognita

An experiment was laid out in wet temperate high hill zone Kinnaur of Himachal Pradesh consecutively for four years to work out avoidable yield losses induced by the infestation of root-knot nematode (Meloidogyne incognita) on Rajmash (var Jawala). Treated (phorate 10 G @ 0.3 g ai/m²) and untreated beds (6 m² size) in the replication of six were maintained in the nematode infested field. The results revealed that with 18.7–28.0 per cent reduction in root gall index and 40.0–83.3 per cent decrease in the J2 (2^nd stage juveniles) population of the nematode, 15.4–23.0 per cent yield increase in treated beds in comparison to control was recorded.