Waiting for resistance
THE "imminence" of new resistant varieties, which yield nearly as well in the UK as conventional types when grown on rhizo-free soils, will soon spell the end of containment, according to Dr Asher.
One in particular, KWS455, in its second year of NIAB trials, could be on the market by 1997.
Since April, Brooms Barn has been licensed to work with rhizo-tolerant varieties in glasshouses. Growers using such types would inevitably return some virus to the soil.
"We must assess whether that would increase soil inoculum levels to threaten future crops."