DAMAGE ASSESSMENT AND MANAGEMENT OF INSECT PESTS OF BROCCOLI

Abstract

An experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from September, 2018 to May, 2019 to evaluate the damage assessment and management of insect and other arthropod pests of broccoli. The experiment was laid out in Randomized Complete Block Design (2 factor) replicated with three times. For this study, factor A- V 1 : Local variety (Anika), V 2 : BARI broccoli 1 and V 3 : Exotic variety and factor B- T 1 : Contact (Malathion 57EC @ 2ml/L of water); T 2 : Systemic (Actara 25WG @ 0.12gm/L of water); T 3 and T 0 : Stomach (Sevin 85WP @ 1gm/L of water), T 4 ii : Antifedent (Neem oil @ 3ml/L of water) : Control. The cutworm infestation on broccoli seedlings was highest in V 1. The infestation was initiated in the broccoli field at 4 DAT and become maximum at 10 DAT. The infestation was declined gradually and no infestation was recorded at 18 DAT.

The incidence of insect pests like aphid, diamond back moth, cabbage semi-looper, Jassid and mole cricket, insect pest infestation (i.e. leaves and plants) were lowest and highest in yield attributing characteristics (i.e. plant height, number of leaves, length of leaves, breadth of leaves, curd height, curd diameter, perimeter of curd, curd weight/plot and yield/ha) for exotic variety.The incidence of aphid, diamond back moth, cabbage semi-looper, jassid and mole cricket, the number of infested leaves and plants caused by insect pests were low and high in case of plant height, number of leaves, length of leaves, breadth of leaves, curd height, curd diameter, perimeter of curd, curd weight/plot and yield/ha for spraying neem oil @ 3ml/L of water. Again, Exotic variety along with spraying neem oil @ 3ml/L of water showed the best performance in reducing the number of insect incidence, insect infestation (i.e. leaves and plants) and yield attributing characteristics. The order of rank was V 3 < V 2 T 1 < V 1 T 4 < V 3 T 2 < V 1 T 1 < V 2 T 2 < V 1 T 2 < V 3 T 3 < V 2 T 3 < V 1 T 3 < V 3 T 0

< V 2 T 0 < V 1 T 4 < V 2 T 0