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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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20231
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Subject: Agricultural Entomology × Author: Akhtar, Shahnaz ×
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    ThesisItemOpen Access
    BIOEFFICACY AND DISSIPATION PATTERN OF CHLORANTRANILIPROLE AND JATROPHA OIL AGAINST MAJOR PESTS OF CABBAGE
    (2023) Akhtar, Shahnaz; Choudhury, Kasturi
    The present experiment on ‘Bioefficacy and dissipation pattern of chlorantraniliprole and jatropha oil against major pests of cabbage’ was carried out during 2022-2023. The field experiment was carried out at Experimental Farm, Department of Horticulture and the laboratory experiments were carried at Residue Laboratory, Department of Entomology, Assam Agricultural University, Jorhat and Guwahati Biotech Park, Amingaon. The insecticide and botanical used in the experiment were chlorantraniliprole 18.5 SC and jatropha oil respectively. The insect pests found in field during the period Nov-Jan (2022-2023) were cabbage butterfly (Pieris brassicae), cabbage aphid (Brevicoryne brassicae), cutworm( Agrotis ipsilon), cabbage semilooper ( Trichoplusia ni), white spotted flea beetle( Monolepta signata), head borer ( Hellula undalis) and mustard aphid ( Lipaphis erysimi) and 4 species of coccinellid predators viz., red and yellow colour morphs of Coccinella transversalis, Cheilomenes sexmaculata, Harmonia dimidata and Propylea dissecta. After 1, 3, 5, 7 and 10 days of spraying, chlorantraniliprole 18.5SC @ 0.3ml/l showed maximum percent reduction of lepidopteran pests (90.70 to 92.90) followed by jatropha oil @ 7 ml/l (57.00 to 73.90) and highest infestation was observed in control. In case of Brevicoryne brassicae, the maximum percent reduction was observed in chlorantraniliprole 18.5 SC@ 0.3ml/l (74.40) which was statistically at par with jatropha oil@ 7ml/l (64.00). Chlorantraniliprole and jatroha oil had no significant effect on the population of coccinellid beetles. The highest yield was obtained from chlorantraniliprole 18.5SC @ 0.3ml/l treated plots (302.05 q ha-1), which was statistically at par with jatropha oil @ 7ml/l treated plots (299.15 q ha-1). Benefit cost ratio was also highest in jatropha oil@ 7ml/l treated plots (2.4:1). The lowest yield was obtained in control plot (111.95 q/ha). The initial deposits of chlorantraniliprole 18.5SC at 0 day was 0.44 mg kg-1 followed by 0.30, 0.15 and 0.06 mg kg-1 at 1 day, 3 days and 5 days respectively. The highest dissipation (86.36%) of chlorantraniliprole 18.5SC was recorded 5 days after spraying. The initial deposit of jatropha oil at 3 and 5 ml/l were found below detectable range while the residues of jatropha oil at 7 ml/l could be detectable only at 0 day (1hr) after spraying (0.08mg kg-1). The half-life values calculated were 1.8 days for chlorantraniliprole 18.5 SC @ 0.3 ml/l. The initial deposit of chlorantraniliprole @ 0.3ml/l was found to be below MRL. Therefore, a waiting period of 5-6 days and 1 day for chlorantraniliprole and jatropha oil, respectively has been suggested to avoid any health hazards to the consumers.