Author(s):

Niwas Dubey Azad and Vinod Kumar Singh

Abstract: The commercial yield of banana in Bihar, India, mainly affected by <em>Odoiporus longicollis</em> and <em>Cosmopolites sordidus</em>. The present study has been designed to test the impact of infestation of these two banana pest on four common varieties of banana plant namely, Malbhog, Alpan, Champa and Harichhal during different seasons in banana cultivation areas of Koshi and Vaishali in the state of Bihar, India during 2015-16. Observations were made in pre-monsoon, monsoon, post monsoon and winter periods of 2015 and 2016. The metrological data of 2015-16 has also studied. The percentages of incidence were transformed in to the angular values and results obtained in respect of relative impact of pest on different varieties of banana have been recorded. The result shows that the banana stem borer <em>Odoiporous longicollis</em> caused highest damage in monsoon and its impact on Malbhog variety during monsoon is highest(49.2%) followed by Harichhal (46.49%), Champa (42.90%) and Alpan (40.88%). Another important pest <em>Cosmopolites sordidus</em> caused damage to Malbhog, Champa, Alpan and Harichhal during the season pre-monsoon (13.20%, 4.92%, 3.49% and 9.09%), monsoon (15.62%, 4.95%, 4.93% and 12.91%), post-monsoon (14.75%, 2.88%, 2.80% and 10.28%) and winter (12.56%, 4.33%, 3.12% and 6.15%) respectively. The relative evaluation clearly reveals that Malbhog variety of banana is more susceptible to infestations of <em>Odoiporous longicollis</em> as well as <em>Cosmopolites sordidus</em> the stem and root borer pests of banana followed by Harichhal, Champa and Alpan varieties by and large in all the four seasons in spite of relative differences among themselves. However, the percent of damage during monsoon and post-monsoon seasons as compared to pre-monsoon and winter seasons are relatively greater and susceptible.

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