author(s)
Sagili Jhansi Lakshmi, Roopa Bai RS, Sharanagouda H, Ramachandra CT and Sushila Nadagouda

abstract
The effect of Zinc oxide nanoparticles at different concentrations [ 0 (T₀), 25 (T₁), 50 (T₂), 75 (T₃), 100 (T₄), 125 (T₅), 150 (T₆), 175 (T₇) and 200 (T₈) ppm] on pulse beetle (Callosobruchus maculatus) (Col.: Chrysomelidae) in greengram was studied in terms of different entomological parameters viz., adult mortality, number of eggs, seed weight loss and seed damage. The percent mortality was recorded on 1^st, 2^nd, 4^th, 7^th and 14^th days of treatment. The highest mortality was found in treatment T₈ with 100% on 14^th day which was statistically on par with treatment T₇ (95.00%). There was no mortality observed in control on 1^st and 2^nd day, whereas on 14^th day, it was 36.67%. The number of eggs per 100 seeds were less in treatment T₈ (13.33) and the highest was recorded in control with 27.33 eggs/100 seeds. The weight loss in seed due to infestation recorded was lowest (1.83%) in treatment T₈ which was statistically on par with T₇ (2.38%) and T₆ (2.43%) and the highest in control (2.88%). Similar trend was also noticed in seed damage (14.00%), the lowest in treatment T₈ and the highest in control (34.00%).