Vol. 12, Issue 6 (2023)

Author(s):
Manoj Kumar, Pradeep Kumar, Dr. Sarvendra Singh, Akhilesh Kumar and Arunendra Pandey

Abstract:
Field experiments were conducted in Rabi season during 2021-22 at the Organic Agricultural Research farm Narayan Bagh, Department of Entomology, Institute of Agricultural Science, Bundelkhand University, Jhansi (U.P.). To study the seasonal incidence of different insect pests on cauliflower. The aphid population varied from 4.6 to 45/plant. Aphid first appeared during 48th MW (29-05 Dec.) with intensity of 4.6/plant, then the population gradually increased and attained peak during 2nd MW (10-16 Jan). After that, the population decreased up to 7th MW (14-20 Feb.) at the end of the season. The larval population of diamond back moth (DBM) varied from 2.9 to 7.00/plant. DBM first appeared during 50th MW (13-19 Dec.) with intensity of 2.9/plant, then the population gradually increased and attained peak during 2nd MW (10-16 Jan). After that, the population decreased up to 7th MW (14-20 Feb.) at the end of the season. when the prevailing maximum temperature, minimum temperature, morning relative humidity, evaporation, bright sunshine and wind velocity were 19.2 °C, 10.4 °C, 91.0%, 71.0%, 1.7 mm, and 2.9 Kmph respectively. The observation on larval count of leaf webber depicted in that the larval population ranged from 1.4 to 4.4/ plant. The incidence of leaf webber was noticed from 50th MW (13-19 Dec.) to (14-20) February 7th MW. The peak incidence was observed in 1st MW (03-09 Jan.) After that, the larval population decreased up to 7th MW (14-20 Feb.) (1.4/plant). The larval population of tobacco leaf eating caterpillar was recorded from 0.6 to 3.6/plant. The activity of tobacco leaf eating caterpillar initiated during 50th MW (13-19 Dec.) with gradual increase its population and reached its peak (3.6/plant) during 1st MW (03-09 Jan.) when the prevailing maximum temperature, minimum temperature, morning relative humidity, evening relative humidity, evaporation, bright sunshine and wind velocity were 20.9 °C, 7.7 °C, 91.0%, 71.0%, 2.0 mm, and 3.1Kmph, respectively. After that, the larval population decreased up to 7th MW (14-20 Feb) (0.6/plant).