Vol. 11, Issue 7 (2022)

Author(s):
Lavlesh Kumar, Dharm Raj Singh and Ram Singh Umrao

Abstract:
Studies on the population dynamics of diamondback moth (Plutella xylostella L.) on cabbage were carried out during rabi season in 2019-20 and 2020-21 at Student’s Instructional Farm (SIF) of the Department of Agronomy, C. S. Azad University of Agriculture and Technology, Kanpur Uttar Pradesh, India on cabbage variety Savitri. The P. xylostella was active throughout the year with a varying degree of infestation. The initial incidence of the pest was observed (0.92 & 0.52 larvae/ plant) on 3^rd and 2^nd and reached peak (4.52 & 4.48 larvae/ plant) on 9^th SMW during 2019-20 and 2020-21 respectively. The studies indicated positive significant correlation between larval population of Plutella xylostella L. and maximum temperature (r = 0.520), minimum temperature (r = 0.513), sunshine hours (r = 0.659) and wind velocity (r = 0.473) but the negative non significant correlation between larval population and relative humidity morning (r = -0.133), relative humidity evening (r = -0.367) and rainfall (r = -0.090) whereas, the correlation between larval population of diamondback moth and adult population of Coccinella septempunctata L. was recorded highly positive significant (r = 0.967). The Coccinellid beetles was recorded as an important predator of cabbage ecosystem, which was maximum (4.36 adults/ plant) on 9^th SMW during 2019-20 and 2020-21 respectively.