potato tuber necrotic ring disease

[Browning, Isla]

The PVY isolate causing Potato Tuber Necrotic Ring Disease affects 
cultivars which are either immune or possess high levels of field 
resistance to PVY. The symptoms described resemble those I have 
experienced on manual inoculation of PVA resistant cultivars with PVA. 
The resultant tubers grow poorly and may show leaf drop streak.I would 
be interested to hear if anyone considers that the symptoms induced by 
the PVYNRD isolate are in fact resistance reactions.

Isla Browning
Diagnostics and Molecular Biology Section 
SASA
Edinburgh.