Flower bud infestation pattern of Leucinodes orbonalis on brinjal with respect to different environmental parameters
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Keywords:Brinjal shoot and fruit borer, flower bud infestation, environment parameters.
AbstractBrinjal Shoot and Fruit Borer (BSFB), Leucinodes orbonalis Guenee is a major pest of brinjal known forÂ infesting shoot and fruits causing substantial yield loss in the crop. However, it was observed that thisÂ insect pest also infests the flower buds leading to premature flower drop and poor fruit setting. The extent ofÂ flower bud infestation, its variation within and between the seasons and the effect of various environmentalÂ parameters on its variation was studied during the kharif and summer seasons of 2009-10 and 2010-11Â at Keonjhar, Odisha. During kharif season, flower bud infestation initiated from 2nd week of July in bothÂ the years of study with peak infestation at 3rd week of September (41.45%) during 2009 and 1st week ofÂ October (38.33%) in 2010. During summer season the larval infestation on the flower buds was noticedÂ for the first time on 2nd week of February with two peak infestation levels during the crop growth period.Â The initial peak was observed 1st fortnight of April (40.33% in 2010 and 38.42 % in 2011) and the secondÂ peak was attained on 3rd week of May in both the years (37.55% in 2010 and 36.29% in 2011). AmongÂ the environmental parameters, temperature had positive and relative humidity had negative influence onÂ the variation in flower bud damage and these environmental parameters had major contribution in theÂ fluctuation of flower bud infestation by BSFB.
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