Guru GyaanAgroStar Agronomy Centre of Excellence
Management of Potato Cutworm
Potato is considered to be the king of all vegetables, and most farmers follow its cultivation. This crop is mainly damaged by cutworm and leaf eating caterpillars. At the time of crop maturity, potato tuber moth also leads to severe damage.
Fully developed caterpillars are green or black coloured and have pale red head. On slight touch, it has a habit of twisting the hood. It hides in the soil near stem of the plants during day time. During day time, larva does not come into view due to its hiding nature within the soil. At night, caterpillars come out and cut the stem near the soil surface and feed on leaves and tender parts. In the morning, number of plants are seen fallen. Reduction of yield may be due to loss of plant population. In the later stage of the crop, it can also damage tubers and feed insides. As a result, along with the quality, yield is also affected, especially potato is grown along the river-side.
• Collect and destroy the larvae if observed during day time. _x000D_
• Install one light trap in the field. _x000D_
• If pheromone traps are available, install 10 per hectare._x000D_
• As the larvae are active during day time only, they hide under the weeds. Hence, keep small heaps of grass in field during evening hours and collect early morning along with the larvae and destroy them. Follow this practice regularly for the reduction of larval population. _x000D_
• Irrigate the infested field. The hiding larvae may come up and are consumed by the predatory birds. _x000D_
• In next year, plough the field and expose them so that larvae/pupae die due to sun heat or are eaten by predatory birds. _x000D_
• If problem is worse during this season, follow crop rotation with Bajra. Castor, Cotton, etc. instead of vegetable crops namely tomato, Brinjal, Chilli. _x000D_
• Apply Chlorpyriphos 20 EC @2 lit per 1,000 lit of water in hectare over plants. _x000D_