Haulms in seed crop of potato are cut during

Haulms in the seed crop of potato are cut during End of the December or, the 1^st week of January.
Potato Haulms are the stems or tops of crop plants (such as peas or potatoes), especially after the crop has been gathered.
Haulm killing refers to killing potato vines (haulms) 7 to 21 days before harvest to promote uniform development of skin colour and develop abrasion resistance.