Evaluation of Biorational Insecticides Against Pigeonpea Pod Borer

Abstract

A field study was carried out to evaluate the efficacy of biorational insecticides against pigeonpea pod borer Maruca vitrata (F.) at the Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, Uttar Pradesh during kharif, 2016 and 2017. From the cumulative mean data, it was found that among the ten biorationals evaluated, spinosad 45SC @ 0.4 ml/ l led to the maximum % larval incidence reduction (90.32 and 93.61% during 2016 and 2017, respectively) and also led to maximum reduction in % pod infestation (65.31 and 65.29%) with maximum % increase in yield (77.63 and 77.37%). This treatment also gave a C:B ratio of 1:3.36 and 1:3.74. Comparably, the next best was emamectin benzoate 5SG @ 0.3 g/ l, with 86.93 and 90.89% reduction in larval incidence and 62.52 and 62.63% reduction in pod infestation, with 76.38 and 75.49% increase in yield with a C:B ratio of 1:9.80 and 1:10.34.

Screening of Some Long Duration Pigonpea (Cajanus cajan (L.) Millsp.) Genotypes against Major Insect Pests in Varanasi

“…Pigeonpea is attacked by a large number of insects at all growth stages. From seedling to harvest stage, about 250 species of insects belonging to 61 families of 8 orders infesting this crop are known, although only a few of them have been found to cause significant damage to the crop (Singh et al 2014, Yadav et al 2016. On an estimate, losses due to insect pests may vary from 27% to 100% and on an average annually 2.5 to 3.0 million tonnes of pulses are lost (Srilaxmi and Paul 2010).…”

“…The major insect pests of pigeonpea are redgram pod fly Melanogromyza obtusa, gram pod borer Helicovelpa armigera, spotted pod borer Maruca vitrata and pod sucking bug (Clavigralla gibbossa) (Sunitha et al 2008;. Among all insects, pod fly Melanagromyza obtusa (Malloch) (Diptera: Agromyzidae) is the most obnoxious one causing grain damage ranging from 20 to 80% (Subharani and Singh 2009). The pod fly oviposit eggs on the inner surface of the pod walls.…”