Studies on population fluctuation of Helicoverpa armigera (Hub.), Earias vitella (Fab.) and their management on Okra in Western Plain Zone of U.P.

Abstract

The present investigation was carried out to study the “population fluctuation of Helicoverpa armigera (Hub.), Earias vitella (Feb.) and their management on okra in Western Plane Zone of U.P.” in randomized block design with three replications and nine treatments at Horticulture Research Center of Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut. The shoot and fruit borer (Earias vitella) and fruit borer (Helicoverpa armigera) was recorded as major pest. The result revelled that all treatments significantly reduced the shoot and fruit borer of okra population as compared to control except flubendamide 0.0144% @ 60 g a.i./ha which was found to be significantly effective among all the treatments as it recorded lowest in shoot and fruit borer of okra population followed by indoxacarb 14.05 SC @ 0.007%,spinosad 45% SC @ 0.05%, imidaclopride 17.8% SL @ 0.3ml/lt, monocrotophos 36% SL @ 0.5%, NSKE 5% @ 2 g/lt, neem oil 1500 ppm @2.5ml/lt and Beauveria bassiana CFU 2×109 @2 g/lt respectively. All treatments significantly reduced the Helicoverpa armigera of okra population as compared to control except imidacloprid 17.8 SL @ 0.3 ml/lt which was found to be significantly effective among all the treatments as it recorded lowest in shoot & fruit borer of okra population followed by flubendamide 0.144% @ 60 g a.i./ha, indoxacarb 14.05 SC @ 0.007%, spinosad 45% SC @ 0.05%, monocrotophos 36% SL @ 0.5%, NSKE 5% @ 2 g/lt, neem oil 1500 ppm @2.5ml/lt and Beauveria bassiana CFU 2×109 @2 g/lt respectively. The peak population of Earias vitella was recorded during 40th SW (i.e. 1st to 7th Oct 2018). After 35th SW there was a decline in the shoot borer population also and it was available up to 40th SW (i.e.27th Sept to 7th Oct 2018). The peak population of Helicoverpa armigera was recorded during 40th SW (i.e. 1st to 7th oct 2018).Maximum cost benefit ratio was obtained in flubendamide 0.0144% @ 60 g a.i./ha recorded ( 1: 16.95), followed by indoxacarb 14.05 SC @ 0.007% ( 1: 12.10) spinosad 45% SC @ 0.05% (1: 11.78), imidacloprid 17.8% SL @ 0.3 ml (1: 15.60), monocrotophos 36% SL @ 0.5% (1: 14.25). Treatment NSKE 5% @ 2 g/lt (1: 8.90), neem oil 1500 ppm@ 2g/lt. (1: 8.84) and Beauveria bassiana CFU 2×109 @ 2g/lt (1: 7.84) respectively.