Effect of zinc oxide nanoparticles on pulse beetle (Callosobruchus maculatus) (Col.: Chrysomelidae) in greengram
Sagili Jhansi Lakshmi, Roopa Bai RS, Sharanagouda H, Ramachandra CT and Sushila Nadagouda
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 1st, 2nd, 4th, 7th and 14th days of treatment. The highest mortality was found in treatment T8 with 100% on 14th day which was statistically on par with treatment T7 (95.00%). There was no mortality observed in control on 1st and 2nd day, whereas on 14th 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%).