Seasonal Incidence and Management of Major Insect Pests of Cabbage, Brassica oleracea var. capitata Linn. in Semi-arid Region of Rajasthan
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Date
2011
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SWAMI KESHWANAND RAJASTHAN AGRICULTURAL UNIVERSITY, BIKANER S.K.N. COLLEGE OF AGRICULTURE, JOBNER
Abstract
Investigations on “Seasonal incidence and management of major insect
pests of cabbage, Brassica oleracea var. capitata Linn. in semi-arid region of
Rajasthan” were carried out at S.K.N. College of Agriculture, Jobner (Rajasthan)
and residue laboratory, ARS, Durgapua during Rabi, 2008-09 and 2009-10.The
cabbage crop was found to be infested by two major insect pests, viz., aphid,
Lipaphis erysimi (Kalt) and diamondback moth, Plutella xylostella (L.) during both
the years. The infestation of aphid, L. erysimi was started in the last week of
November and reached to peak in third and fourth week of January during Rabi
2008-09 and 2009-10, respectively. Whereas, the infestation of diamondback
moth was started from the third week of November and reach to peak in the first
week of January during both the years. The maximum and minimum temperatures
showed significant negative correlation with aphid and larval population of
diamondback moth, whereas, relative humidity and sunshine hours showed non
significant correlation. The coccinellid predator, C. septempunctata was recorded
as a important predator of aphid on cabbage crop, which was maximum in the
second and third week of January during 2008-09 and 2009-10, respectively.
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