The cereals root eelworm,Heterodera major (O. Schmidt) Franklin,in North Wales

The cereals root eelworm Heterodera major (O. Schmidt) is shown to be locally distributed in North Wales, the most heavily infested centres being in the arable districts of the eastern counties of the province. The most severe attacks occurred on oats where the crop had been grown too frequently; wheat and barley were apparently unaffected at the cyst populations encountered.