Seasonal incidence of major insect-pests of soybean in malwa region of Madhya Pradesh.

During Kharif season of 2007, 12 insect species, while during 2008 and 2009. 13 insect pests and one mite were observed on soybean. These pests were identified as. Gesonia gemma (Swinhoe), Chrysodeixis acuta (Walker), Spodoptera litura (Fab.), Helicoverpa armigera (Hub.), Myllocerus maculosus (Desbro), Gryllus sp.; Cneorane sp., Luperus clytie (Wilcox) and Mocis undata, Stem borers viz. Obereopsis brevis (Swed.) and Melanagromyza sojae (Zehnt.); and sap feeders Bemisia tabaci (Gennadius), and Chauliops fallax (scott.). Of these, Cneorane sp., Gesonia gemma, Chrysodeixis acuta, Melanagromyza sojae and Obereopsis brevis were recorded as major pests. During 2007 the infestation reached up to 13.5 per cent, while during 2008 and 2009 up to 26.6 and 30.5 per cent respectively before harvesting of the crop.