The experiments were carried out at Bidhan Chandra Krishi Viswavidyalaya, West Bengal, India to investigate the bio-effectiveness of an insect growth regulator-lufenuron 5.4% EC against pod borer complex on blackgram along with economics of yield parameters and impact of agro-meteorological factors on their incidence during October to January of 2011-2012 and 2012-2013. The treatments at higher dosages (30, 40 and 60 g a.i./ha) found superior over standard checks novaluron 10% EC and indoxacarb 15.8% EC. The infestation of Helicoverpa armigera and Maruca testulalis were minimum in treatments of higher dosages with overall mean ranging from 13.11-15.71% and 9.11-11.43% mean pod damage respectively. The compound found very soft to prevailing predatory fauna viz., Chrysoperla and Menochilus. The highest yield (18.06 and 19.02 q/ha) was obtained in case of higher dosages. After commencing the pod borer activities from 28 to 30 days after sowing, Helicoverpa armigera reached peak during third week, while Maruca testulalis reached peak at second week of December and both the borers have showed significant positive correlation with maximum temperature and were found negatively correlated with minimum temperature.