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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: BORA, MAYURAKSHI × End date: 2023 × Start date: 2023 × Type: Thesis ×
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    ThesisItemOpen Access
    STUDY ON MAJOR INSECT PESTS OF TOMATO AND THEIR ECO-FRIENDLY MANAGEMENT
    (2023) BORA, MAYURAKSHI; Borah, Nirmali
    An experiment entitled “Study on major insect pests of tomato and their eco-friendly management” was conducted at the experimental farm for PG research, Biswanath College of Agriculture, Sonitpur during rabi season of 2022-23. During the present investigation, 11 insect pests from four orders and eight families were recorded as pests of tomato in the field, viz., whitefly, Bemisia tabaci (Gennadius); aphid, Aphis craccivora Koch; leafminer, Lyriomyza trifolii (Burgess); fruitborer, Helicoverpa armigera (Hubner); jassid, Amrasca biguttula biguttula (Ishida); semilooper, Trichoplusia ni (Hubner); epilachna beetle, Henosepilachna vigintioctopunctata (Febricius); flea beetle, Monolepta signata (Olivier); tobacco cutworm, Spodoptera litura (Febricius); cutworm, Agrotis ipsilon (Hufnagel) and green stink bug, Nezara viridula (Linneous). Two coccinellid predators from order coleoptera viz., Micraspis discolor (Fabricius) and Cheilomenes sexmaculata (Febricius) and two spider species Lycosa tista Tikader, Anyphaena accentuata (Walckenaer) were also recorded as natural enemies. Among them B. tabaci, A. craccivora, L. trifolii, H. armigera, A. biguttula biguttula, T. ni, coccinellid predators and spider were found to be most dominant species during the present study. From the correlation study it was observed that aphid population showed a significant negative correlation with both maximum(r = - 0.709**) and minimum temperature(r = -0.511*). Whitefly population registered a negative significant correlation with both maximum(r = -0.745**) and minimum temperature(r = -0.757**) and positive significant correlation with morning relative humidity(r = 0.671**). Jassid exhibited a negative but significant correlation with both maximum(r = -0.782**) and minimum temperature(r = -0.520*). A significant negative correlation was observed between leafminer population and bright sunshine hour(r = - 0.613*). The population of fruit borer registered significant negative relationship with bright sunshine hour(r = -0.674**). Furthermore, cabbage semilooper showed significant negative correlation with maximum temperature(r = -0.611*) and bright sunshine hour(r = -0.542*). As regards coccinellid predators, it showed significant negative correlation with maximum temperature (r = -0.525*), minimum temperature(r = -0.684**) and rainfall(r = - 0.528*) and significant positive correlation with morning relative humidity(r = 0.516*). A significant positive correlation of aphid population was also observed with coccinellid predator population(r = 0.743**). Among the seven treatments tested viz., neem oil @ 5ml/lit, garlic extract @ 5ml/lit, biogreen-L @ 5ml/lit, neem oil @ 5ml/lit + garlic extract @ 5ml/lit, neem oil @ 5ml/lit + biogreen-L @ 5ml/lit, garlic extract @ 5ml/lit + biogreen-L @ 5ml/lit, neem oil @ 5ml/lit + garlic extract @ 5ml/lit + biogreen-L @ 5ml/lit, neem oil @ 5ml/lit + biogreen-L @ 5ml/lit was found to be the best treatment in reducing pests population which was closely followed by neem oil @ 5ml/lit + garlic extracts @ 5ml/lit. Neem oil @ 5ml/lit + biogreen-L @ 5ml/lit treated plot showed the best result in reducing the per cent infestation of leafminer and fruit borer. The highest yield (299.56 q/ha) was obtained from the plot treated with neem oil @ 5ml/lit + biogreen-L @ 5ml/lit with a benefit cost ratio of 3.91. The natural enemy (coccinellid) population was found to be more in neem oil @ 5ml/lit treated plots.