author(s)
Pravasini Behera and Bijoy Kumar Mishra

abstract
Field experiments were conducted to investigate 10 treatments comprising of individual and combined doses of egg and larval parasitoids Trichogramma chilonis and Cotesia flavipes respectively to study the biological control of maize stem borer Chilo partellus (Swinhoe) in Kharif maize in Odisha. The experiment carried on 10 isolated field each of 0.25 ha and hybrid maize variety Hishell was taken. The parasitized eggs and larvae of C. partellus were recorded from five plants replicated three times in same field. The data obtain were analysed by complete randomized block design. The result obtained from field trail revealed that the combination of egg and larval parasitoids of treatment: 1, 50,000 Trichogramma chilonis parasitized eggs + 1500 Cotesia flavipes pupae)/ha gave the best result with highest egg parasitisation (80.47%) and larval parasitisation (46.52%) of maize stem borer with maximum grain yield 52.54 q/ha in both Kharif 2014 and 52.03 q/ha in Kharif 2015 with most economically remunerative and highest B:C ratio of 1:1.54.