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Assam Agricultural University, Jorhat

Assam Agricultural University is the first institution of its kind in the whole of North-Eastern Region of India. The main goal of this institution is to produce globally competitive human resources in farm sectorand to carry out research in both conventional and frontier areas for production optimization as well as to disseminate the generated technologies as public good for benefitting the food growers/produces and traders involved in the sector while emphasizing on sustainability, equity and overall food security at household level. Genesis of AAU - The embryo of the agricultural research in the state of Assam was formed as early as 1897 with the establishment of the Upper Shillong Experimental Farm (now in Meghalaya) just after about a decade of creation of the agricultural department in 1882. However, the seeds of agricultural research in today’s Assam were sown in the dawn of the twentieth century with the establishment of two Rice Experimental Stations, one at Karimganj in Barak valley in 1913 and the other at Titabor in Brahmaputra valley in 1923. Subsequent to these research stations, a number of research stations were established to conduct research on important crops, more specifically, jute, pulses, oilseeds etc. The Assam Agricultural University was established on April 1, 1969 under The Assam Agricultural University Act, 1968’ with the mandate of imparting farm education, conduct research in agriculture and allied sciences and to effectively disseminate technologies so generated. Before establishment of the University, there were altogether 17 research schemes/projects in the state under the Department of Agriculture. By July 1973, all the research projects and 10 experimental farms were transferred by the Government of Assam to the AAU which already inherited the College of Agriculture and its farm at Barbheta, Jorhat and College of Veterinary Sciences at Khanapara, Guwahati. Subsequently, College of Community Science at Jorhat (1969), College of Fisheries at Raha (1988), Biswanath College of Agriculture at Biswanath Chariali (1988) and Lakhimpur College of Veterinary Science at Joyhing, North Lakhimpur (1988) were established. Presently, the University has three more colleges under its jurisdiction, viz., Sarat Chandra Singha College of Agriculture, Chapar, College of Horticulture, Nalbari & College of Sericulture, Titabar. Similarly, few more regional research stations at Shillongani, Diphu, Gossaigaon, Lakhimpur; and commodity research stations at Kahikuchi, Buralikson, Tinsukia, Kharua, Burnihat and Mandira were added to generate location and crop specific agricultural production packages.

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2000 - 200932010 - 20151
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Subject: Entomology × End date: 2016 × Thesis Type: Ph.D ×
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Now showing 1 - 4 of 4
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    ThesisItemOpen Access
    Pest complex of French bean and Management of the major pests through Development and Validation of certain IPM modules
    (AAU, Jorhat, 2015-07) SHARMAH, DIGANTA; Rahman, S.
    The present investigation was carried out in the ICR farm, AAU, Jorhat-13 as well as in the Acarology laboratory, Department of Entomology, Assam Agricultural University, Jorhat during 2013-14 and 2014-15 to record pest complex of french bean with their incidence; management of the major pests through development and validation of certain IPM modules and to evaluate certain plant extract against aphid and two spotted spider mite (TSSM). Eight insect pests viz. cutworm, Agrotis ipsilon; aphid, Aphis craccivora; thrips, Scirtothrips dorsalis; pod borer, Helicoverpa armigera; white fly, Bemesia tabaci; leaf beetle, Menolepta signata; leaf miner, Liriomyza sativae; red ant, Dorylus orientalis and a mite pest i.e. two spotted spider mite, Tetranychus urticae were recorded. The incidence of aphid and cut worm was found to be maximum during the 51st Standard meteorological week (SMW) with 1.33 numbers per twig per plant and 1.0 number per plant, respectively. Highest population of TSSM and thrips were recorded during 52nd SMW i.e.1.23 and 0.97 number per leaf, respectively. The incidence of pod borer and whitefly was found to be maximum during the 51st SMW with 1.12 per plant and 52nd SMW with 1.23 numbers per leaf, respectively. The incidence of leaf beetle, leaf miner and red ant was found to be minor. Meteorological parameters had a significant impact on population build up of various French bean crop pests. Cutworm population had a positive and significant correlation with morning relative humidity. Aphid had a positive significant correlation with maximum temperature and BSSH but negative with relative humidity. TSSM population had a positively significant correlation with relative humidity and negatively with maximum temperature. Pod borer population showed a negative significant correlation with maximum temperature and positive correlation with relative humidity. Whitefly population showed a negative significant correlation with maximum temperature and positive correlation with relative humidity. Thrips had a negative significant correlation with rain fall. Significantly lesser per cent incidence of Aphid (0.60%) was seen in Module-I than Module-III (2.58%) and Module-II (6.0%). But highest percentage of aphid incidence (13.40%) was registered in Module-IV. The mean population of thrips varied from 1.0 to 10.0 per cent among the modules. Module-I was found to be superior by recording significantly less incidence of thrips (1.04%) than Module-III (2.6%) and Module -II (4.0%). Considerably higher per cent incidence of thrips was observed in Module-IV (10.0%). The per cent population of mite was least (1.0%) in Module-I compared to Module-III (3.0%) and Module -II (7.6%). However, maximum incidence of mites was recorded in Module -IV (9.0%). Whitefly incidence was recorded to be minimum (1.2% in Module -I compared to Module -III (2.80%) and Module -II (4.0%). While highest percent incidence of whitefly was registered in Module -IV (10.8%). The mean per cent population of pod borer varied from 0.40 to 8.40% among the different modules. Module-I was found to be superior by recording significantly less incidence of pod borer (0.40%) and was significantly differed from Module -III (3.2%) and Module-II (5.8%). The highest healthy green bean yield ha-1 was achieved in Module I (13.99t ha-1) followed by Module-III (13.91t ha-1), Module II (13.56t ha-1) and Module-IV (9.88t ha-1). The effectiveness of IPM Modules in respect to B:C ratio were obtained to be 2.06, 1.95 and 1.97 from Module –I, II and III respectively. Efficacy of seven plant extract viz. Polygonum hydropiper, Murraya koenigii, Jatropha curcas, Piper longum, Ocimum sanctum, Phlogacanthus thyrsiflorus and Pongamia pinnata were evaluated against aphid (A. craccivora) and TSSM (Tetranychus urticae) under both laboratory and field condition and all were found to be effective in reducing pests population as compared to control. LC50 were calculated for the different plant extracts and found that Piper longum (3.39% & 3.41%), Jatropha curcas (4.17% & 4.37%), Polygonum hydropiper (4.37% & 4.57%), Phlogacanthus thyrsiflorus (5.13% & 5.23%), Murraya koenigii (5.25% & 5.35%), Pongamia pinnata (5.25% & 5.37%) and Ocimum sanctum (5.62% & 5.66%) against the aphid and TSSM, respectively after 48 hrs. of exposure period. The highest per cent mortality of both aphid and TSSM were obtained in Piper longum (3%) 75.46% & 66.85% after 96 hrs. of exposure period followed by Jatropha curcas (4%) with 65.89 % & 58.89%, Polygonum hydropiper (4%) with 63.89% & 57.31%, Phlogacanthus thyrsiflorus (5%) with 60.19% & 51.02%, Murraya koenigii (5%) with 55.56% & 48.61%, Pongamia pinnata (5%) with 52.31% & 46.11% and Ocimum sanctum (6%) with 48.61% & 36.57%, respectively under laboratory condition. Under field condition highest per cent reduction of both aphid and TSSM were obtained in Piper longum (3%) with 84.38% & 63.41% after 7 days of treatment followed by Jatropha curcas (4%) with 73.53% & 52.50%, Polygonum hydropiper (4%) with 72.73% & 50%, Phlogacanthus thyrsiflorus (5%) with 60.0% & 44.74%, Murraya koenigii (5%) with 56.25% & 43.59%, Pongamia pinnata (5%) with 45.0% & 40% and Ocimum sanctum (6%) resulted 39.39% & 37.84%, respectively.
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    ThesisItemOpen Access
    Mating Behaviour Of Callosobruchus Chinensis (L.) And Effect Of Neem Products On Its Reproduction
    (Assam Agricultural University; Jorhat, 2000) Deka, Mridul; Dutta, D. N.
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    ThesisItemOpen Access
    Bioecological Studies Of Pod Borer, Helicoverpa Armigera Hubner And Its Important Natural Enemies In Pigeonpea
    (Assam Agricultural University; Jorhat, 2002) Borah, Smriti Rekha; Dutta, S. K.
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    ThesisItemOpen Access
    Population Ecology And Varietal Preference Of Aphis Gossypii Glover And Henosepilachna Vigintioctopunctata (Fab.) On Brinjal
    (Assam Agricultural University; Jorhat, 2000) Shaw, Kanchan Kumar; Dutta, S. K.