Singh, Uma ShankarM, Monica Preeth2020-11-172020-11-172020M/Nema/342/2018-19https://krishikosh.egranth.ac.in/handle/1/5810155148Detailed investigations were carried out to study the plant parasitic nematodes associated with tomato grown in polyhouses located in and around Pusa, Dholi and Birauli regions of Bihar. The studies were conducted with the main objective to survey to know the incidence of different plant parasitic nematodes by collection of soil and root samples from tomato crop rhizospheres grown in polyhouses; to screen the available tomato genotypes against root knot nematodes, Meloidogyne spp. and to study the integrated management of Meloidogyne spp. infecting tomato cv. Heemsohna by soil application of bio control agents (Pseudomonas fluorescens and Trichoderma viride), organic amendment (neem cake) and chemical nematicide (carbofuran 3G). All the experiments were conducted under protected environment (polyhouse). Survey and collection of soil and root samples revealed the presence of Meloidogyne spp., Rotylenchulus reniformis, Helicotylenchus spp., Pratylenchus spp., dorylaimids (Xiphinema spp.) and other saprophytic nematodes in tomato rhizospheres. Of these, Meloidogyne spp., was found to be the most predominant. An initial inoculum level of 1000 J2 root knot nematodes per plant caused yield reduction in tomato plants of all eight genotypes including MS – 2, Heemsohna, TO – 3150, Shivam, Prabhav 1322, Annapurna, PKM – 1 and Somnath. Pot culture studies conducted using bio control agents (Trichoderma viride and Pseudomonas fluorescens), organic amendment (neem cake) and chemical nematicide (carbofuran 3G) as integrated management of Meloidogyne spp on tomato cv. Heemsohna revealed that two treatments, Trichoderma viride+ Neem cake and Trichoderma viride + carbofuran 3G (at 5 + 25 g/pot and 5 + 10 g/pot respectively) effectively reduced the numbers of Meloidogyne spp. besides increasing the plant growth parameters. This was also the best combination among all the treatments where the root-knot index was found to be 1 (least).EnglishThesis