Central Potato Research Institute, Shimla, 171 001, (HP).
Experiments were conducted during 1998 and 1999 at Kufri-Fagu (NW hills) to study the role of aphids on the rate of degeneration of potato seed and ware crops. The degeneration of potato crop was positively correlated with the aphid population build up and vectorial activity of main aphid, Myzus persicae.