Field Reaction of Certain Pigeonpea (Cajanus cajan (L.) Millsp.) Genotypes to Gram Pod borer, Helicoverpa armigera (Hubner)

摘要

Eight medium duration pigeonpea genotypes were screened for three years during kharif season of 2003, 2004 and 2005, to evaluate for their field reaction against Helicoverpa armigera (Hubner) at Agricultural Research Station, Warangal, Andhra Pradesh.Observations on mean oviposition, larval infestation and per cent pod damage due to H. armigera over three years were computed. The entry VRG-1 recorded significantly lowest oviposition (2.69 eggs plant~(-1)) followed by WRG-27 (5.15 eggs plant~(-1)), LRG-41 (5.67 eggs plant~(-1)). Significantly lowest larval load was found in VRG-1 (1.31 larvae plant~(-1)), WRG-27 (1.45 larvae plant~(-1)) followed by LRG-41 (1.87 larvae plant~(-1)). Least pod damage of 7.80% was found in the entry LRG-41. The entriesLRG-41, WRG-55 and WRG-27 gave higher yields of 2382, 2246 and 1808 kg ha~(-1) respectively and were superior to the check entries ICPL-332, ICPL-84060 and ICP-8863.