Journal of FARM SCIENCES, Vol 22, No 3 (2009)

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Validation of integrated pest management modules for the management of podborer, Helicoverpa armigera (Hubner) and Fusarium wilt in pigeonpea based intercropping system

Suhas Yelshetty, J.B. Gopali, Raju Tegelli, Y.D. Narayana

Abstract


In an attempt to develop an integrated management strategy for Fusarium wilt and pigeonpea pod borer, Helicoverpa armigera (Hubner), two intercrops viz. sesame and sorghum with two modules comprising of biointensive and pesticides were compared with untreated check. Significant difference in wilt incidence was observed over two years when wilt susceptible cultivar (PT-221) was used under different intercropping systems. The maximum wilt incidence of 44.37 and 8.14 per cent was noticed in sole pigeonpea followed by pigeonpea + sesame (28.90 and 6.28%) and pigeonpea + sorghum (31.69 and 3.16%). Pigeonpea+ sorghum intercropping with pesticide based IPM module consisting of ovicidal application of thiodicarb 75 WP @ 0.625 kg/ha followed by chloropyriphos 20 EC @ 2.5 l/ha and alphamethrin 10 EC @ 0.5 l/ha  was found significantly superior in reducing the pod damage (31.75%) and recorded higher grain yield (13.55q/ha).  Pigeonpea + sorghum intercropping with biointensive IPM module consisting of application of Neem seed extract (5%), HaNPV 250 LE/ha and Bacillus thuringiensis (Bt) @ 1 kg/ha followed the pesticide based IPM. Higher net returns of Rs.11569, Rs.15374 and Rs.13170 and benefit cost ratio of 3.24:1, 4.10:  and 3.30:1 were recorded in inter crop of pigeonpea + sorghum (1:2) and pesticide based IPM module over other treatments.  The study indicated the superiority of pigeonpea + sorghum intercropping with pesticide based IPM module.


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