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Subject: Agricultre × Author: Konwar, Joyshree × Start date: 2017 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    STUDIES ON NON-CHEMICAL METHODS OF MANAGEMENT OF TEA PESTS AND USE OF OIL BASED FORMULATIONS AGAINST RED SPIDER MITE
    (2022) Konwar, Joyshree; Saikia, Gautam Kumar
    An investigation entitled “Studies on non-chemical methods for management of tea pests and use of oil based formulations against red spider mite” was carried out in the Experimental Garden for Plantation Crops (EGPC) and Department of Entomology, Assam Agricultural University, Jorhat during 2019-2021. The study was undertaken to survey non-chemical methods of management of red spider mite used by twenty (20) small tea growers of Sivasagar district of Assam and to study the efficacy of oil based formulations for management of red spider mite in-vitro. It was found in the survey that 50% of the tea growers used cow urine and water with Neem (Azadirachta indica), Pothorua bihlongoni (Polygonum hydropiper) and Karanj (Pongamia pinnata) combinations for management of red spider mite. Twenty percent (20%) of the tea growers used cow urine and water alone. Oil cake, cow dung, bhoot jolokia (Capsicum chinense), garlic (Allium sativum), limestone, curd and other ingredients were also used in small quantities. Home-made mustard and sesame oil were taken for laboratory experimentation on red spider mite, Oligonychus coffeae at 0.5%, 0.75% and 1% concentration alone or in combination with cow urine. Among the oil based treatment combinations, sesame oil 1% + cow urine 5% was found to be most effective for management of red spider mite. All the treatments of sesame oil were found to be effective in reducing rate of oviposition of red spider mite which were at par with commercial neem (1:1500). Egg hatchability was found to be reduced satisfactorily when the tea leaves were sprayed with sesame oil1% and sesame oil 1% + cow urine 5% and were at par with commercial neem. Sesame oil 0.75% + cow urine 5%, sesame oil 1% and sesame oil 1% + cow urine 5% were found to be effective for mortality of nymphs of red spider mite which were at par with commercial neem. Adult mortality was found to be at par with commercial neem when sprayed with sesame oil 0.75%, sesame oil 0.75% + cow urine 5%, sesame oil 1% and sesame oil 1% + cow urine 5%. From the present study, it can be concluded that the non-chemical methods which are prevalent among the tea growers if scanned, validated and standardized scientifically would definitely help in the management of tea pests. These pest control practices serve as an alternative to overcome the ill effects of synthetic chemical pesticides. Thus, studies on oil based formulations mixed with cow urine or without cow urine showed possible incorporation and utilization in tea IPM programme.