Nemato-toxic potential of <em>Trichoderma harzianum</em> and <em>T. viride</em> extra-cellular metabolites and <em>Annona glabra</em> crude extraction on <em>Meloidogyne incognita</em> infestation

Root-knot nematode, Meloidogyne incognita (Kofoid and White) is one of the most destructive plant parasitic nematode species in almost all agriculture horticulture crops Sri Lanka. Biologically sound controlling measures against this has been attempted from long past with ambiguous efficacy. This paper highlights nemato-toxic potential crude leaf extract Annona glabra, extracellular metabolites Trichoderma harzianum T. viride on root-knot species, infesting spinach plants under semi-field conditions. Results revealed that infested treated showed a significantly higher growth together reduced root galling compared to A. glabra extract. Both treatments increased at rate 125 g/L fungus mycelium 140 mg/L 100 respectively resulted highest M. incognita. study concludes positive effect antagonists tested suggests activity lytic enzymes enhanced effect.