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Dr. Rajendra Prasad Central Agricultural University, Pusa

In the imperial Gazetteer of India 1878, Pusa was recorded as a government estate of about 1350 acres in Darbhanba. It was acquired by East India Company for running a stud farm to supply better breed of horses mainly for the army. Frequent incidence of glanders disease (swelling of glands), mostly affecting the valuable imported bloodstock made the civil veterinary department to shift the entire stock out of Pusa. A British tobacco concern Beg Sutherland & co. got the estate on lease but it also left in 1897 abandoning the government estate of Pusa. Lord Mayo, The Viceroy and Governor General, had been repeatedly trying to get through his proposal for setting up a directorate general of Agriculture that would take care of the soil and its productivity, formulate newer techniques of cultivation, improve the quality of seeds and livestock and also arrange for imparting agricultural education. The government of India had invited a British expert. Dr. J. A. Voelcker who had submitted as report on the development of Indian agriculture. As a follow-up action, three experts in different fields were appointed for the first time during 1885 to 1895 namely, agricultural chemist (Dr. J. W. Leafer), cryptogamic botanist (Dr. R. A. Butler) and entomologist (Dr. H. Maxwell Lefroy) with headquarters at Dehradun (U.P.) in the forest Research Institute complex. Surprisingly, until now Pusa, which was destined to become the centre of agricultural revolution in the country, was lying as before an abandoned government estate. In 1898. Lord Curzon took over as the viceroy. A widely traveled person and an administrator, he salvaged out the earlier proposal and got London’s approval for the appointment of the inspector General of Agriculture to which the first incumbent Mr. J. Mollison (Dy. Director of Agriculture, Bombay) joined in 1901 with headquarters at Nagpur The then government of Bengal had mooted in 1902 a proposal to the centre for setting up a model cattle farm for improving the dilapidated condition of the livestock at Pusa estate where plenty of land, water and feed would be available, and with Mr. Mollison’s support this was accepted in principle. Around Pusa, there were many British planters and also an indigo research centre Dalsing Sarai (near Pusa). Mr. Mollison’s visits to this mini British kingdom and his strong recommendations. In favour of Pusa as the most ideal place for the Bengal government project obviously caught the attention for the viceroy.

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20221
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Subject: Entomology × Author: DAS, ABHIBANDANA ×
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    ThesisItemOpen Access
    FIELD BIOEFFICACY AND RESIDUE DYNAMICS OF THIACLOPRID AND EMAMECTIN BENZOATE IN CHILLI AGAINST THRIPS, Scirtothrips dorsalis Hood
    (DRPCAU, PUSA, 2022) DAS, ABHIBANDANA; Sahoo, Sanjay Kumar
    “Field Bioefficacy and Residue Dynamics of Thiacloprid and Emamectin Benzoate in Chilli against Thrips, Scirtothrips dorsalis Hood” was carried out at “Dr. Rajendra Prasad Central Agricultural University, Pusa” during the summer season of 2022. Thiacloprid 21.7% SC and Emamectin benzoate 5% SG was sprayed three times on the chilli crop at their recommended dose, 1.5 times the recommended dose and twice the recommended dose for bioefficacy study. Emamectin benzoate at its double dose reduced the thrips population to 1.20 / 3 leaves / plant after 10 days from the 3rd spray, with the highest overall mean reduction over control (86.63 %). Highest green chilli yield of 76.30 q/ha was obtained from this treatment with an 18.72 % increase in yield over control and ICBR of 1:3.86. For residue study insecticides were sprayed at recommended and double the recommended dose. Representative chilli samples were analysed by UHPLC following slightly modified QuEChERS technique. After second and third application, initial residue deposit for thiacloprid at recommended and twice the recommended dose varied from 0.67-0.69 mg/kg and 1.14-1.19 mg/kg, respectively. Initial emamectin benzoate residues at 0 day for recommended and double dose ranged from 0.29-0.30 mg/kg and 0.42-0.48 mg/kg, respectively. Thiacloprid residue dissipated below the LOQ level after 7 and 10 days for recommended and double dose, respectively. Residue of emamectin benzoate at recommended and double dose reached below LOQ level after 5 days. After assessment of dissipation pattern of thiacloprid, its half-life value in chilli was found to be 2.01-1.94 days at recommended dose and 1.96-2.30 days at double dose. Initial residue amount from recommended dose decreased to reach below the prescribed MRL value after 8.79-8.75 days. Similarly, initial deposit from the double dose reduced below MRL value after 10.22-11.96 days. Residue of emamectin benzoate at recommended and double dose reached half-life value at 0.76-0.88 days and 1.25 days, respectively. The residue level of emamectin benzoate at recommended and double dose was calculated to reach below the prescribed MRL value after 2.08-2.42 days and 3.85-4.02 days, respectively. Thus, a safe waiting period of 9 days is suggested for thiacloprid in chilli at recommended dose. Similarly, a safe waiting period of 3 days is found suitable for emamectin benzoate when sprayed at its recommended dose. Among the three doses of thiacloprid, its application at 72 g a.i./ha effectively decreased thrips population, with good ICBR and had an acceptable waiting period. Similarly, emamectin benzoate at 10 g a.i. per ha was found to effectively manage thrips population, besides having a high ICBR value, safe waiting period and posing less residue load on the environment. Between both the insecticides, the recommended dose of emamectin benzoate is more effective in managing thrips population along with high returns, high ICBR and low waiting period for safe consumption of chilli by following GAP.