Abstract
Sorghum stem borer, Chilo partellus Swinhoe is one of the serious pests of sorghum and maize crops in Asia and throughout East and South Africa. In India, it is becoming as the most damaging insect pest particularly in Dharwad region of north Karnataka by causing economic losses during kharif and rabi seasons. The observations on population dynamics of egg masses, larvae, pupae, number of plant damaged and parasitic interactions of natural enemies with larvae and pupae of C. partellus were recorded at weekly interval at Dharwad (Karnataka). The stem borer population was significantly higher in kharif than in rabi -summer crop. The larval parasitoid, Cotesia flavipes was found to be very active in kharif season and maximum parasitization of 29% was recorded in November whereas Sturmiopsis inferens was prevalent during rabi -summer crop and maximum parasitization of 28% was recorded during February. A population of 2% pupal parasitoid, Tetrastichus sp., was also recorded during kharif season.
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