Detection of PVX and PVS during indexing of hill material was found to be 1.44 to 6.80 times higher at Jalandhar than Simla. It was adversely affected at Simla by lower glasshouse temperature and tuber dormancy. The indexing of non-dormant material for PVX/PVS infection, 13 weeks after harvesting, was observed to give better detection when grown and tested at a temperature range of 6.0–29.5°C than dormant material (2 weeks after harvest) at temperature range of 12.5–28.5°C. However, it was not at par with the per cent detectability of two viruses as observed at Jalandhar in partially dormant and non-dormant material (i.e. 9 and 17–18 weeks after harvest respectively) at a temperature range of 15.5–32.5°C. At Jalandhar the detection of the two viruses was higher in more physiologically advanced material of eye-lets than the less advance one.
