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Studies on the duration of different stages of the onion thrips, Thrips tabaci L at Muzaffarpur, Bihar, India

Manendra Kumar*
University Deptt. of Zoology, B.R.A. Bihar University, Muzaffarpur-842001
Bihar, India
Received : 15th April, 2015; Revised : 17th June, 2015

Abstract : Allium vegetables have been cultivated for centuries for not only their characteristic pungent flavours but also for their medicinal properties. The possible health benefits of onions include lowering the risk of several types of Cancer, improving mood and maintaining the health of skin and hair. India ranks second in onion production (next to China). India produces about 12% of World’s production of onion. In Bihar, onion is cultivated in about 16,000 hac. Bihar is fifth onion producing state of India. Bihar has no impressive production performance of onion, but, the agro– climatic conditions and the soil of Bihar is too much suitable and ideal for onion. Out of various factors for low onion production in Bihar, insect infestation is very important. Onion thrips, Thrips tabaci is most important insect pest of onion. Present investigation was carried out to study the duration of different stages of the onion thrips in Muzaffarpur (Bihar). Life cycle duration was minimum (12.5 days) in April while it was maximum (26.5 days) in January.

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