IMPACT OF BIOPESTICIDES APPLICATION ON POD BORER COMPLEX IN ORGANICALLY GROWN FIELD BEAN ECOSYSTEM

Abstract

ABSTRACT The investigation was carried out at the Agriculture Research Station, Balajigapade, Chickaballapura district during kharif season 2009. The evaluated biopesticides were NSKE (5%), HaNPV (250 LE/ha), Bt (1kg/ha), neem oil (2%), Panchagavya (3%), Clerodendron + Cow urine extract (10%) and sequential spray of HaNPV-Bt -NSKE, Bt-NSKE-HaNPV and NSKE-HaNPVBt. FYM (9.5 t ha-1) and bio-digester liquid (6,500 l ha-1) were applied to organic plots. Sequential spray of insecticidal spray (Carbaryl-Endosulfan-Malathion) and recommended dose of FYM (7 tha-1), fertilizer (25:50:25 kg NPK ha-1) were applied to inorganic plot. Pod borers viz., Helicoverpa armigera (Hübner), Maruca testulalis Geyer, Exelastis atomosa Walshinghan, Sphenarches caffer Zeller, Etiella zinkenella (Treitschke), Lampides boeticus Linnaeus, Adisura atkinsoni Moore emerged as serious pests during cropping period. Sequential spray of insecticides carbarylendosulfan-malathion applied at 45, 55 and 70 DAG, respectively recorded less insect pests abundance. Among biopesticides, sequential application of NSKE-HaNPV-Bt was effective against insect pests. HaNPV was effective against H. armigera larvae, but ineffective to other pod borers. Panchagavya and clerodendron + cow urine extract were ineffective in reducing the pod borer incidence. Among biopesticides treated plots, sequential application of NSKE-HaNPV-Bt recorded higher grain yield (10.01qha-1) whereas, package of practices followed treatment (inorganic plot) recorded 11.37 qha-1 grain.