Management of root- knot nematode Meloidogyne incognita in tomatowith liquid bioformulations

Abstract

Root-knot nematodes are one of the major plant parasiticnema todes i n tomato (Solanum lycopersicum L. ).Considering its damage potential, a field experiment was piloted for the management of root-knot nematode,Meloidogyne incognita in tomato. For this study, Bacillussubtilis (1% A.S) and Bacillus amyloliquefaciens (1% A.S)liquid bio formulations were evaluated. The liquid bioformulations were evaluated in two delivery mechanismssuch as nursery drench (5 ml/litre of water) and soilapplication of bioformulations (5 l ha-1) enriched with FYM(20 t ha-1) individually and in combination and theirnematicidal efficacy compared with carbofuran 3G (1 kg a.i.ha-1) and combined application of carbofuran 3G (1 kg a.i.ha-1) with FYM (20 t ha-1). Among the bioformulations,integrated application of B. amyloliquefaciens (1% A.S)(nursery drench and soil application of enriched FYM)consistently exhibited greater nematicidal activity byresulting maximum percent reduction of nematodepopulation in soil 77.1, 61.5 and 74.6 during 2015-16, 2016-17 and 2017-18, respectively. Therefore, we able to harvest marketable yield of 24.0, 22.5 and 31.1 t ha-1 during 2015-16,2016-17 and 2017-18, respectively which was next to combined application of carbofuran 3G (1 kg a.i.ha-1) withFYM (20 t ha-1). Subsequently, it was followed by B. subtilis1% A.S (nursery drench and soil application of enrichedFYM) found promising and recorded percent reduction of nematode population in soil 52.5, 55.8 and 70.4 with marketable yield of 20.0, 22.0 and 30.4 t ha-1 during 2015-16,2016-17 and 2017-18, respectively. The present findingsindicate that, liquid bioformulations of B. amyloliquefaciens(1% A.S) and B. subtilis (1% A.S) with its delivery mechanisms can be considered as a component under integrated nematode management of M. incognita infecting tomato under field condition.