Evaluation of Bio-efficacy of. Novel Insecticides Against Helicoverpa Armigera (Hubner) in Black Gram. (Vigna Mungo L.)

Abstract

For present investigations entitled "Evaluation of bio-efficacy of novel insecticides against Helicoverpa armigera (Hubner) in Black gram Vigna mungo L.)" the field experiment was conducted in randomized block design with three replications of seven treatments during Kharif season 2012 at of crop research centre (Chirori farm), Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut (U.P.) 250110. In extensive study, thirteen species of insects belonging to the four orders were observed to be associated with black gram viz. Orthoptera (one species), Hemiptera (four species), Lepidoptera (six species) and coleopteran (two species). The pod borers Helicoverpa armigera and Maruca vitrata, were recorded as 'major pests'. while Leaf hopper, Empoasca kerri, iii Pod bugs, Riptortus pedestris, tobacco caterpillar, Spodoptera /itura, Semilooper, Plusia orichalcea, Blue butterfly, Lampides boeticus, and Bihar hairy caterpillar Spilosoma obliqua were recorded as 'major pests' and black aphid, Aphis craccivora, Whitefly, Bemisia tabaci, Surface Grasshopper, Chrotogonus trachypterous and Blister beetle, My/abris pustule were recorded as 'minor' pests in Black gram. Bio efficacy of different treatments viz., fleubendiamide 480 SC@ 75 ml/ha indoxacarb 14.5 SC @ 500 ml/ha, cypermethrin 25 EC @1000 ml/ha, lambda cyhalothrin 5 EC @ 500 ml/ha, novaluron 1 OEC 750 ml/ha and carbosulfan 25 EC 1 000 ml/ha tested against H. armigera larvae revealed that fleubendiamide 480 SC@ 75 ml/ha was found best with minimum population of H. armigera at first spray 0.33 larvae (3 DAS) and 0.67 larvae (7 DAS), and the minimum larval population at second spray 0.00 (3 DAS) and 0.00 larvae (7 DAS), minimum percent pod infestation at first spray 9.21 (3 DAS) and 10.07 (7 DAS), and minimum percent pod infestation at second spray 10.42 (3 DAS) and of 9.58 (7 DAS). Effect of different treatments on Coccinella septumpunctata revealed that fleubendiamide 480 SC@ 75 ml/ha was safe and maximum population of Coccinella at first spray 3.00 (3 DAS) and 3.33 adults/ten plants (7 DAS), followed by novaluron 1 OEC 750 ml/ha and the minimum adults population at first spray 0.00 (3 DAS) and 0.67adult/ten plants (7 DAS) in carbosulfan 25 EC 1000 ml/ha. The treatment with fleubendiamide 480 SC@ 75 ml/ha was also feufld . best with the highest grain yield (9.28 q/ha), maximum increase in yield (7 .19 q/ha) over control, maximum net return (Rs. 29946.00/ha) and highest cost iv benefit ratio (1 :9.57) followed by indoxacarb 14.5 SC @ 500 ml/ha, The cypermethrin 25 EC @1 000 ml/ha was recorded less effective among all the treatments.