Abstract
A field trial was conducted at the experimental farm of Project Coordinating Unit Sesame and Niger (ICAR), College of Agriculture, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur (Madhya Pradesh) during pre-rabi season, 2018 on TKG-22 variety. Economic injury level was worked out by calculating seed yield obtained from incidence/ population levels of Antigastra (0, 1, 2, 3, 4, 5, 6, 2.38 and 0.45 larvae/ plant) maintained from 20 DAS to till maturity of the crop. The total cost involved in the insecticide protected treatment was calculated taking into account the cost of three foliar sprayings of profenophos 50 EC (2 ml/ l). The correlation coefficient between larval population and seed yield was found highly significant (r= -0.92) and relationship was found negative. The regression equation showed that the yield of sesame seeds was reduced by 1.16 q/ ha for every increase of one larvae/ plant during pre-rabi 2018. The economic injury level was found 0.74 larvae/ plant for sesame during pre-rabi 2018.
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