Evaluation of different doses of Trichogramma species for the management of leaf folder and stem borer on Basmati rice

Different doses of Trichogramma species were evaluated against leaf folder and stem borer on Basmati rice in farmers' field. Seven releases of Trichogramma chilonis Ishii and T. japonicum Ashmead each @ 100000, 125000 and 150000 hectare⁻¹ at weekly interval starting at 30 DAT (days after transplanting) were made. All the three doses were effective for the control of leaf folder and stem borer and also helped to increase the parasitization and yield. Thus the lower dose (100000 ha⁻¹) of both the parasitoids can be used for the control of two pests. The incidence of leaf folder was significantly lower in the plots where cartap hydrochloride 4G @ 25kg ha⁻¹ was applied three times. The releases of egg parasitoids at all the doses were equally and significantly better than control.