Bio-efficacy of Some Novel Insecticides Against Pod Borer Complex Ofpigeonpea

Abstract

An investigation was carried out to evaluate some novel insecticides against pod borer complex of pigeonpea during Kharif 2012 and 2013 at Crop Research Centre of Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut in a randomized block design with ten treatment and three replications. During the crop season, 17 insect species encountered on pigeonpea at different crop growth stages. Among them, pod borer, Helicove1pa armigera (Hubner), Legume pod borer, Maruca vitrata (Geyer), lablab pod borer, Adisura atkinsoni (Moore), jassid, Empoasca kerri (Pruthi) and pod fly, Nfe/anagromyza obtusa (Malloch) were recorded as major pests. The Grapholita (Cydia) critica (Meyr.), Lampides boeticus (L.), Clavigralla gibbosa (Spinola), Riptorus sp, Nezara viridula (L.) and Mylabris pustulata (Thunberg) were found to damage the crop moderately. The other pests recorded on the crop were of less importance and extent of their damage was found much economic loss. The population of M vitrata recorded first on last week of .September and reached its peak during last week of October. The infestation of H armigera initiated at second week of October and reached its peak during last week of October to first week of November. The larval population of A. atkinsoni observed first during first week of October which reached its peak during last week of October. The pod fly population initiated first at first week of October and reached its peak during last week of November. The population of these insect pests was influenced by one or more abiotic factors and crop stages. Efficacy of different treatments viz. spinosad 45 SC @ 500 ml/ha, flubendiamide 480 SC @ 80 ml/ha, novaluron 10 EC @ 750 mllha, bifenthrin 20 EC @ 500 ml/ha, indoxacarb 14.5 SC@ 500 ml/ha, carbosulfan 25 EC@ 1000 ml/ha, lambda cyhalothrin 5 EC@ 500 ml/ha, profenofos 50 EC @ 500 ml/ha and quinalphos 25 EC @ 500 ml/ha against major pod borers revealed that all the treatments were found significantly effective in reducing the infestation of pod borers and increasing the yield as compared to control. The most effective treatment in reducing the infestation of pod borers was indoxacarb 14.5 SC and followed by spinosad 45 SC. The highest yield was recorded from indoxacarb, whereas highest cost benefit ratio obtained from lambda cyhalothrin during both the years.