Journal of FARM SCIENCES, Vol 17, No 3 (2004)

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Seasonal Incidence of Helicoverpa armigera Hubner and Validation of Integrated Pest Management in Pigeonpea Ecosystem

V.I. Benagi, N.M. Sunil Kumar, Raju G. Teggelli, Kalavati Kase

Abstract


The large scale demonstration on IPM of redgram podborer was conducted on an area of 125 acres in Sannur and Farthabad villages of Gulbarga district of Karnataka. The activity of pest was recorded from flower bud initiation till harvest. The pest population crossed the Economic Threshold Level during the 43rd International Standard Week (ISW) (3.7eggs/plant), 48th ISW (1.5larvae /plant) and during 50th ISW (1.3larvae/plant ) at Sannur and at Farthabad during 47th ISW (2.08 eggs/plant), 49th ISW (1.37 larvae/plant) and 52nd ISW (1.0 larvae/ Plant). Whenever the ETL was crossed the control measures as per the IPM schedules were imposed and managed the pest successfully. However in Non-IPM fields the calendar-based sprays were given.  The seed yield in IPM fields was 7690kg and 9700kg/ha and  in non IPM fields 7300 kg & 8050 kg/ha it was at Sannur and Farthabad ,respectively. The per cent pod damage in IPM field was10.8 & 10.4 compared to 17.1 & 15.94 in Non IPM fields at Sannur and Farthabad villages, respectively. By adopting the IPM module an additional income of Rs.1457 and Rs. 3305 was obtained at Sannur and Farthabad, respectively.

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