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Subject: Nematology × Author: Gogoi, Hemanga Jyoti × End date: 2017 × Start date: 2013 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Occurrence and distribution of plant parasitic nematodes associated with tea gardens in Dibrugarh district of Assam
    (AAU, Jorhat, 2017-01) Gogoi, Hemanga Jyoti; Borah, A.
    The present investigations were carried out to know the occurrence and distribution of plant parasitic nematodes associated with tea plants of different tea gardens in Dibrugarh district. Soil samples were collected from different tea gardens of seven blocks from Dibrugarh district. Survey of plant parasitic nematodes revealed that eight genera of plant parasitic nematodes were found to be associated with tea plants of Dibrugarh district. The genera of plant parasitic nematodes recorded were viz., Helicotylenchus, Hoplolaimus, Tylenchorhynchus, Paratylenchus, Meloidogyne, Xiphinema and also nematodes genera found under tylenchs and criconematids. Community analysis of plant parasitic nematodes revealed that the genus Helicotylenchus ranked first in relative frequency, absolute frequency, absolute density, relative density and prominence value. The genus Hoplolaimus ranked second in relative frequency, absolute frequency, absolute density, relative density and prominence value. The genus Paratylenchus ranked third in relative frequency, absolute frequency, absolute density, relative density and prominence value. Studies on bio-management of root-knot nematode Meloidogyne incognita on tea under pot condition showed that all the treatments with Glomus fasciculatum, Trichoderma harzianum, Trichoderma viride, neem cake and carbofuran 3 G alone or in combination significantly increased plant growth parameters of tea and decreased number of galls, eggsmasses and final nematode population in soil over control. The maximum increase in plant growth parameters viz., shoot length, root length, fresh and dry weight of shoot and root were recorded with the treatment Glomus fasciculatum @ 300 spores/kg of soil + Trichoderma harzianum @ 4 gm/kg of soil + neem cake @15 gm/kg of soil. While, the maximum reduction of number of galls and egg masses and final nematode population in soil were recorded in the treatment with carbofuran 3G @ 3 g/kg of soil followed by the treatment with Glomus fasciculatum @ 300 spores/kg of soil + Trichoderma harzianum @ 4 gm/kg of soil + neem cake @15 gm/kg of soil which were at par. The treatment with Glomus fasciculatum @ 300 spores/kg of soil + Trichoderma harzianum @ 4 gm/kg of soil + neem cake @15 gm/kg of soil was found to be best in increasing plant growth parameters of tea and in decreasing number of galls, eggsmasses and final nematode population in soil over control.