EFFECTIVENESS OF SOME INSECTICIDES FOR MANAGEMENT OF POTATO INSECT PESTS

Abstract

The present study was carried out on the effectiveness of some insecticides for management of potato insect pests. There were seven treatments such as T 1

(Pheromone Trap +Neem seed kernel extract), T 2 (Fipronil), T 5 (Pymetrozine + Nyten pyram), T 6 (Diazinon), T 3 (Carbofuran), T 4 (Cartap + Acetamiprid) and a check T 7

were evaluated on potato crop at the Sher-e-Bangla Agricultural University in Dhaka city during Rabi season from October 2017 to March 2018. The insecticides were applied at initial stage of crop growth and early mid stage of potato plants. The data were collected by counting cut plant by cutworm , by counting number of infested leaves by aphids by counting number infested tuber and weighing of infested tuber by cutworm, by counting the number of virus infected plants showing leaf roll and mosaic symptoms plant transmitted by aphids in each plot. The lowest number of cut plants was recorded in T 3 and

T 6 (1) treatment and lowest in T 7 (6) . The lowest number of infested leaves was counted in T 1 (1.67%) and the highest number of infested leaves was recorded in T 7 (17.95%) . At 15, 40, 60 days after emergence of seedling, the lowest number of virus infected plants was 1.33, 1.67 and 2.33 counted in T 1 and the highest number of virus infected plants was 4.33, 12.00 and 20.67 recorded in T 7 respectively. The lowest number of infested tuber was counted in T 1 1.33) and the highest number of infested tuber was counted in T 7 (4.00). Average seasonal infestation was the lowest in T 1 (Pheromone trap + neem seed kernel extract) followed by T 6 (Cartap + Acetamiprid) and T 5 (Pymetrozine + Nyten pyram) the highest in check plot. (