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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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20191
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Subject: Entomology × End date: 2019 × Start date: 2019 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Biology of Callosobruchus chinensis (L.) on Green gram, Vigna radiata (L.) and Black gram, Vigna mungo (L.) in two different seasons
    (AAU, Jorhat, 2019-07) Borthakur, Abhilasa Kousik; Gogoi, Inee
    Field and laboratory experiments were conducted in the Instructional cum Research farm, Department of Agronomy, Assam Agricultural University, Jorhat and Department of Entomology, Assam Agricultural University, Jorhat during 2018-19 to examine the biology of Callosobruchus chinensis (L.) in two different seasons viz., summer and winter considering green gram(variety-Pratap) and blackgram(variety-KU301) as host plants. Ovipositional preference of Callosobruchus chinensis (L.) was also evaluated on four different host plants viz., green gram (variety-Pratap), black gram(variety-KU301), chickpea(variety-JG16) and cowpea(variety-Green fall). The data on biology of C. chinensis (L.) revealed that the insect had a comparatively shorter developmental period in the summer season (April-May) than in the winter season (October-November). In green gram, the fecundity of the insect during summer season was 4.96±0.13 number of eggs while in winter it was 3.60±0.19 number of eggs. The incubation period was found to be 4.92±0.14 days and 6.24±0.13 days during summer and winter respectively. The insect took 17.50±0.12 days to complete its larval period during summer and 23.57±0.18 days during winter. The pupal period was recorded to be 7.53±0.09 days during summer and 9.41±0.07 days during winter. Thus the total developmental period was worked out and noted to be 29.95±0.21 days during summer and 39.22±0.22 days during winter. The longevity of the male was upto 7.73±0.23 days during summer while in winter it survived upto 10.36±0.21 days. The longevity of the female was recorded as 6.70±0.21 days and 8.10±0.27 days during summer and winter respectively. In black gram the mean fecundity was recorded as 3.10±0.12 in summer and 1.57±0.11 in winter. The incubation period was recorded as 5.46±0.12 days and 7.37±0.15 days during summer and winter respectively. The larval period was completed in 18.28±0.08 days during summer and 24.50±0.12 days in winter. The pupal period was 8.17±0.07 days and 10.12±0.12 days during summer and winter respectively. The developmental period was completed in 31.91±0.15 days during summer while it took 42.08±0.21 days during winter. The male longevity was 8.90±0.23 days during summer while 9.40±0.29 days during winter. The longevity of the female was 7.40±0.26 days and 6.80±0.20 days during summer and winter respectively. The data on ovipositional preference revealed that green gram was the most preferred host for egg laying with a mean of 17.40 eggs per four pods, followed by chickpea (14.33), cowpea (11.50) and black gram (8.50). Hatchability percentage was maximum in green gram (90.55%) followed by chickpea (86.24%), black gram (82.86%) and cowpea (81.80%). Maximum adult emergence was observed in green gram (79.16%) and minimum adult emergence was observed in black gram (64.82%). Adult emergence in chickpea was 75.53% and in cowpea it was 76.55%. The data on morphological parameters of the pods revealed that cowpea had the maximum pod length (14.13cm), trichome number/mm2 (14.16) and pod wall thickness (0.73mm) . Correlation analysis between ovipositional parameters and morphological parameters of pods revealed that eggs laid, hatchability percentage and adult emergence had a negative correlation with trichome number/mm2 and pod wall thickness, whereas pod length showed a positive correlation with eggs laid, hatchability percentage and adult emergence percentage. Data on growth parameters revealed that the maximum percentage of reproductive success was shown in green gram (65.52%) followed by Cowpea (55.91%), chickpea (54.56%) and black gram (42.32%). Total developmental period was highest in black gram (33.12 days) followed by chickpea (32.12 days), green gram (31.05 days) and least in cowpea (28.13 days). Growth Index was lowest in black gram (1.96) while the highest was found in cowpea (2.73) followed by green gram (2.56) and chickpea (2.35). Correlation between Growth Index and growth parameters showed that Growth Index was negatively correlated to developmental period and positively correlated to adult emergence and number of eggs laid. A significantly high positive correlation between Growth Index and percentage adult emergence was exhibited by cowpea and chickpea.