Orissa University of Agriculture and Technology, India
Pradyumna Tripathy has completed his PhD from Bidhan Chandra Krishi Viswavidyalaya, West Bengal and postdoctoral studies from Orissa University of Agriculture & Technology, Bhubaneswar, Odisha. He is presently working as Horticulturist in AICRP on Cashew, OUAT, Bhubaneswar. He served as Principal Investigator for four years in 100% sponsored ICAR project in All India Network Research Project on Onion and Garlic. He has published 52 research papers in various National & International journals. He has also published 6 practical manuals for B.Sc (Hort.) students, 2 book chapters on organic farming in vegetable crops. He also attended a number of International and National seminars, symposiums and workshops. He is the life member of several professional bodies and societies and has been examiner in different universities. Dr. P. Tripathy is also the author of book entitled, "Organic Farming in India: Problems & Prospects".
Onion (Allium cepa L.) is an important export oriented vegetable among the cultivated Allium in India. Onion Thrips (Thrips tabaci Linderman) is the key biotic factor for reducing yield loses in both bulb as well as seed cops in onion. Besides direct damage to both foliage and bulbs, thrips can indirectly aggravate purple blotch and vector for viral diseases, Iris yellow spot as well. Though host plant resistance is a crucial component of IPM, in absence of high levels of host plant resistance to Thrips tabaci and development of resistance towards number of pesticide of late. There is an urgent need to look at other IPM options for effective management. Field study was conducted under All India Network Research Project on Onion and Garlic, College of Horticulture (OUAT), Sambalpur, Odisha, India during Rabi 2010-11, 2011-12 and 2012-13 to find out the effective eco-friendly IPM modules for management of thrips (Thrips tabaci Linderman) in onion. The treatment consists of M1: IPM module, M2: Farmers' Practices and M3: Control, laid out in RBD. The results obtained over three years indicated that both M1 and M2 not only significantly reduced the thrips population (21.68 and 21.02 thrips plant-1) but also increased total marketable yield (25.86 and 25.70 tha-1), respectively over the control, M3 (39.13 thrips plant-1 and 20.58 tha-1) . Higher BC Ratio was recorded in M1 (3.26) than M2 (2.70). It may be concluded that adoption of IPM module approach consisting of planting of border crop of two rows wheat and maize,10-15days prior to planting, seedling dip treatment with Carbosulfan and need based insecticides spray, when thrips population exceed ETL (30 thripsplant-1) not only reduces the thrips infestation but also increases the bulb yield with quality bulbs in onion.