Evaluation of Banana (Musa spp) germplasm against root-knot nematode (Meloidogyne incognita).

A pot culture experiment was conducted during 2004-05 to evaluate 72 banana (Musa sp.) varieties/cultivars for the tolerance/resistance against root-knot nematode, Meloidogyne incognita. The results indicated diat none of the varieties/ cultivars was resistant to root-knot nematode (M.incognita). However the varieties 'Singhlal', 'Manik' 'Champa', 'Sabri' and 'Warner' showed moderately resistant reaction to root-knot nematode and the varieties 'Malai Kali', 'BattisaPiro', 'Shahil Kela', 'Gragric Sarpara' and 'Elavalai' showed tolerant reaction to root-knot nematode. The remaining 61 accessions were found susceptible to root-knot nematode. Of which 15 were found highly susceptible to root-knot nematode. The resistant variety 'Pisang Lilin' had shown the highest level of resistance to M.incognita whereas the susceptible variety 'Robusta' had exhibited maximum reduction in plant growth and nematode populations showing the highly susceptible reaction to root-knot nematode

Nematicidal Property of Phytochemical Alpha - Terthienyl against Root Knot Nematode, Meloidogyne incognita

Aims: Documentation of the nematicidal effect of Alpha-terthienyl on Meloidogyne incognita. Study Design:  Complete randomized design (CRD). Place and Duration of Study: Department of Nematology, Tamil Nadu Agricultural University, Coimbatore between 2021-2023. Methodology: This study used a purified synthetic compound of Alpha-terthienyl (α-T).it is a plant-derived phytochemical from Marigold (Tagetes sp.). This study examines the effect of alpha-terthienyl on egg hatching and juvenile mortality under laboratory conditions. Four different concentrations of alpha-terthienyl were tested for their influence on in vitro studies. A uniform size of single egg mass of M. incognita was incubated. Observations on hatching were recorded. Juveniles of M. incognita were incubated in alpha-terthienyl were examined. Results: The result showed 100% percent inhibition at 2 ppm concentration. A similar trend was observed in Juvenile (J2) mortality also showed 100% mortality at 2 ppm. A check was maintained in tap water for comparison. Conclusion: According to the findings of this study, Alpha-terthienyl was effective against M. incognita under in vitro conditions. Hence it could be used for the management of M. incognita in vegetable crops which also increase yield