Studies on the Seasonal Incidence and Management of Shoot and Fruit Borer, Leucinodes Orbonalis (Guenee.) on Brinjal in Western Plain Zone of U. P.

Abstract

The present investigations were carried out during the kharif season, 2019 at HRC, Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut (U. P.). The incidence of Leucinodes orbonalis (Guenee.) shoot and fruit borer was recorded. The incidence of shoot and fruit borer commenced in second week of August (0.63%) which gradually increased and reached to peak (14.42%) in the third week of October. The incidence of pest in shoots started declining after fruit setting and completely disappeared second week of December. The infestation of pest on fruits commenced in the first week of September (1.60% on number basis and 0.98% on weight basis) which gradually increased and reached to peak (13.98% on number basis and 13.56% on weight basis) in the fourth week of October at 29.800C maximum temperature, 15.800C minimum temperature and 53.70% evening relative humidity. The correlation studied revealed that the infestation of L. orbonalis on brinjal shoot had significant positive correlation with maximum temperature (r = 0.242), Morning relative humidity (r = 0.189), whereas, non-significant correlation with minimum temperature (r = -0.223), Evening relative humidity (-0.126) and rainfall (r = -0.327). The infestation of L. orbonalis on fruits of brinjal both number and weight basis had significant positive correlation with maximum temperature (r = 0.036 on number basis and r = 0.037 on weight basis) and with morning relative humidity (r = 0.062 on number basis and r = 0.060 on weight basis) whereas, nonsignificant correlation with minimum temperature (r = -0.143 and r = 0.139), Evening relative humidity (r = -0.307 and r = -0.302) and rainfall (r = -0. 445 and r = -0. 430). Among insecticides and bio-pesticides evaluated against brinjal shoot and fruit borer, chlorantraniliprole 18.5% SC treated plots showed lowest infestation and gave higher yield followed by Flubendiamide 480 SC >NSKE 10% >Neem oil 100 ppm. The least effective treatment was Beauveria bassiana CFU 2x109 and Metarhizium anisoliae CFU 1x108. The maximum benefit cost ratio of (1:19.09) was obtained in the treatment of chlorantranilipole followed by flubendiamide (1:15.7), NSKE (1:13.10), neem oil (1:8.46). While, minimum was in Beauveria bassiana (1:6.85) and Metarhizium anisopliae (1:2.24).