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Subject: Nematology × Author: Bhuyan, Pranjal × Start date: 2013 ×
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    ThesisItemOpen Access
    Preliminary screening of some botanicals on Brinjal (Solanum melongena L.) against Root Knot Nematode, Meloidogyne incognita
    (AAU, Jorhat, 2017-01) Bhuyan, Pranjal; Hazarika, Koilash
    Nematicidal activity of twenty one leaf aqueous extract of botanicals like Melia azadarach, Nycanthus arbor-tristis, Ocimum gratissimum, Piper betle, P. nigrum, P. hydropipper, Ricinus communis, Terminalia arjuna, Vitex negundo, Acarus calamus, Azadirachta indica, Bacopa monnieri, Annona squamosa, Psidium guajava, Mimosa pudica, Acorus calamus, Cymbopogon citratus, Pogostemon cablin, Ipomoea carnea, Mikania micrantha and Iberis linifolia were tested against Meloidogyne incognita to know their influence on as mortality and egg hatch inhibition under in vitro condition. The study revealed that all botanicals showed nematode toxicity by killing juveniles (J2) and inhibited egg hatch at 1, 5, 10 per cent concentration at 2, 4, 8, 12 and 24 hours of incubation but among them ten botanicals like A. indica, M. azedarach, P. nigrum, R. communis, M. micrantha, P. betle, O. gratissimum, C. citratus, N. arbor-tristis and P. hydropopper showed strong nematicidal activity and selected for pot experiment. In pot experiment 10 promising botanicals from in vitro test namely A. indica, M. azadarach, P. nigrum, R. communis, M. micrantha, P. betle, O. gratissimum, C. citrans, N. arbor-tristis and P. hydropipper evaluated for their efficacy to manage root-knot nematode problem on brinjal. The study revealed that all the plant extract showed strong nematicidal activity with increasing plant growth parameter of brinjal as compared to untreated control. Among the 10 botanicals the A. indica, M. azadarach, P. nigrum, P. betle and M. micrantha showed strong nematicidal activity against M. incognita, by reducing galls, eggmass/root system and egg/eggmasses with final neamtode population. These plant also increased plant growth parameters like plant height, shoot and root (fresh and dry weight) of brinjal. In the field experiment best five botanicals from pot evaluation such as A. indica, M. azadarach, P. nigrum, P. betle and M. micrantha were selected and evaluated against RKN on brinjal. These five botanicals showed nematicidal activity against M. incognita and improved plant growth parameters of brinjal under field condition as compared to untreated control. But among these A. indica showed maximum plant growth parameters with reduced nematode population.