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Researcher Singh, Harjindra
Advisor Swaminathan, R.
Source KrishiKosh-Indian National Agricultural Research System
Content type Text
Educational Degree Master of Science (M.Sc.)
Publisher MPUAT
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Life sciences; biology
Subject Keyword Insect ♦ Pollinators ♦ Coriander ♦ Yieldis ♦ Insect Pollinators of Coriander and Their Role In Enhancing Crop Yield ♦ Entomology
Abstract Investigations carried out on the “Insect pollinators of coriander and their role in enhancing crop yield†at Rajasthan College of Agriculture, Udaipur, during rabi 2008-09 revealed that hymenopterans and dipterans dominated among the major insect pollinators visiting coriander. Among these, the mean of total hymenopterans visiting the umbels of coriander from 28/12/2008 to 15/2/2009 happened to be 18.89/plant/minute-observation/day; within hymenopterans, A. florea and A. dorsata were the most dominant forming 91.54 per cent. The foraging activity of A. florea was more pronounced during 12-2 p.m. (1.312 bees/ day/ plant/ minute observation), whereas the foraging activity of A. dorsata was maximum during 8-10 a.m. (0.032 bees/ day/ plant/ minute observation). Similarly, the total dipterans happened to be 0.36-flies/plant/minute/day and family Muscidae was the most dominant with 0.26- flies/plant/minutes/day. The foraging activity of muscid flies was the maximum during 4-6 p.m. (0.094-flies/ plant/minute/day) forming 26.70 per cent. The other insect pollinators included Lepidoptera, Hemiptera and Coleoptera and their numerical abundance formed 0.107-insects/plant/minute/day. Of these, hemipteran visitors dominated with 0.091-bugs/plant/minute/day and their foraging activity was the maximum during 4-6 p.m. (10.01%) and minimum at 12-2 p.m. (1.98%). The coriander cremocarp length and width were significantly more when the crop was allowed free visits by insect pollinators under open pollination. The mean seed weight of 5 plants was the maximum under hand pollination followed by that under open pollination. The side-effects of plant origin pesticides evinced a decrease in pollinator intensity ranging from (-) 14.52 to (-) 25.06 per cent. Most of the botanical treatments did not have any side-effects 5 days after treatment; however, plots treated with Azadirachta indica A. Juss oil (1%) continued to show a deterrent effect and the pollinator intensity decreased by 21.57 per cent.
Educational Use Research
Education Level UG and PG
Learning Resource Type Thesis
Publisher Place Udaipur
Size (in Bytes) 342.62 kB
Page Count 49