Forest Protection Division, Institute of Forest Productivity, Gumla Road NH -23, Lalgutwa, Ranchi-835 303, Jharkhand, India
*Corresponding author's E-mail: arvind_ento@rediffmail.com
Online published on 9 April, 2012.
Among the four species evaluated for egg parasitization of H. armigera, Trichogramma chilonis lshii showed the highest percentage of egg parasitization of 83.75% followed by T. pretiosum (68.90%), T. brassiliensis (66.09%) while lowest parasitism was observed in T. poliae (44.99%). the maximum percentage parasitism of 85.27% was observed in the plot where T. chilonis was released @ 1,50,000 eggs/ha. the highest seed set (85.35%) and yield (1.62 tons/ha) was attained in the plots where T. chilonis was released @ 1,50,000 eggs/ha.
Sunflower, Helicoverpa armigera, Trichogramma spp
