Potato crop is attacked and damaged by a number of insect pests which directly cause damage to the tubers. Among these, Red ants (Dorylus orientalis), is one of the most important soil pests of potato reducing the yield up to 35- 40% in West Bengal [6]. The pest made hole on the surface of tuber which reduced tuber yield as well as market quality [7]. The insect is reported causing 70-90% damage at harvest to potatoes in farmer’s fields in Bihar [8]. Dorylus orientalis has long been known as an important pest of potato in middle and higher hills of Nepal [9] and it causes serious damage to potato, radish, carrot, cauliflower, cabbage and many solanaceous and cruciferous vegetables in Nepal [10]. [11] reported that red ant severely damaged the marketable potato tuber yield in Nepal. Red ants are reported as a pest of potato, cauliflower, cabbage, groundnut, sugarcane, and coconut seedlings in the North-Eastern states, Bihar, and Uttar Pradesh [12]. The pest appears during December and remains active until April, causing more than 10% of the damage in irrigated potato crops. High temperatures and dry weather favor population build-up [13]. The pest damages mainly the potato stems and tubers by chewing holes and in case of severe attack plants become wilt in direct sunlight and will eventually dry up [14]. In