Evaluation of IPM modules against Helicoverpa armigera (Hübner)

Results revealed that mean larval population of Helicoverpa armigera was considerably low after insecticidal sprays in different modules and lowest population of the insect (2.59/MRL) was recorded in Module 6 (spinosad @ 0.5 ml/l of water as 1^st spray and indoxacarb @1 ml/l as 2^nd spray) followed by Module 4 (indoxacarb @1.0 ml/l as 1^st spray and triozophos @1.5 ml/l as 2^nd spray) and Module 1 (spinosad @ 0.5 ml/l as 1^st spray and triazophos @1.5 ml/l as 2^nd spray) in 2009–2010. Similar results were also observed during 2010–2011. However, based on benefit-cost ratio, module 1 (1.57 & 1.70) proved more viable than module 6 (1.39 & 1.56) and module 4 (1.35 & 1.55) due to lower cultivation cost in both the seasons.