DAMAGE ASSESSMENT OF MAJOR INSECT PEST OF COLE CROPS AND THEIR ECOFRIENDLY MANAGEMENT

Abstract

The experiment was conducted in the experimental field of SAU, Dhaka, Bangladesh during the period from November 2019 to February 2020 to evaluate the damage assessment of major insect pest of cole crops and their ecofriendly management. The experiment was laid out in Randomized Complete Block Design (2 factor) in three replication. For this study, factor A were V 1 : BARI phulkopi 2 and V 2 : BARI bandhakopi 2 and factor B were T 1 : Using Pheromone traps (@ 2 traps/ plot at 30 days interval); T 2 : Neem seed solution (@ 3ml/L of water at 7 days interval); T 3 : Neem leaf extract (@ 3ml/L of water at 7 days interval), T 4 : Neem oil (@ 3ml/L of water at 7 days interval), T 5 : Spinosad-45 (@ 3ml/L of water at 7 days interval); T 6 : Admire 200SL (@ 3ml/L of water at 7 days interval) and T 0 : Control. The incidence of insect pests like diamond back moth, cabbage semi-looper, cabbage worm and tobacco caterpillar, insect pest infestation (i.e. leaves and plants) were lowest and highest in yield attributing characteristics (i.e. curd height, curd diameter, perimeter of curd and yield/ha) for BARI bandhakopi 2. The incidence of diamond back moth, cabbage semi-looper, cabbage worm and tobacco caterpillar, the percent leaf and plant infestation caused by insect pests were low and high in case of curd height, curd diameter, perimeter of curd and yield/ha for spraying neem oil @ 3ml/L of water. Again, BARI bandhakopi 2 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 contributing characteristics. The order of rank was V 1 T 7 < V 2 T 7 < V 1 < V 2 T 5 < V 1 T 6 < V 2 T 2 < V 1 T 3 < V 2 T 6 < V 1 T 4 < V 2