Question: query regarding control of insect in potato field. 
Answer: --apply and mix phorate/malathion 5% dust/ carbaryl  10 gram/meter squar of soil by removing the upper layer of soil.

storage for seed purpose- treat the potato seed with 30 gram/liter of boric acid, deep the seed in boric acid solution for 3o minutes, after that dry the seed for 2 days in shade and then treat the seed with any fungicide like mancozeb, captan, captaf  3 gram/kg of seed and store in single layer in a air circulated room. 

for feeding purpose- store the seed in a single layer along with dry neem leaf in a air circulated room.