Relative susceptibility of advanced hybrids and promising cultivars of potato, Solanum tuberosum L. to greasy cutworm, Agrotis ipsilon (Hufn.) in North-eastern plains

The extent of damage by cutworm, Agrotis ipsilon (Hufn.) on 12 hybrids and cultivars revealed that the foliage damage was first observed during the third week of December and increased upto second week of January while tuber damage was first recorded in the fourth week of December and continued to increase till harvest. Varieties showed more foliage damage as compared to hybrids. Kufri Chandramukhi suffered maximum foliage damage (2.66%) while hybrid JN 2626 suffered minimum damage (0.90%). Medium sized tubers were more prone to cutworm damage as compared to small and large sized tubers. Kufri Chandramukhi had maximum yield losses i.e. 40.50 and 42.75 q/ha on 75 and 90 days after planting (DAP), respectively. JN 2626 hybrid showed lowest yield losses i.e. 12.75 and 13.00 q/ha on 75 and 90 DAP, respectively.