Barley segregates resistant and susceptible to the cereal cyst‐nematode (Heterodera avenae Woll.)

SUMMARY In the first year of this experiment both nematode‐resistant and susceptible segregates of spring barley were equally invaded by Heterodera avenae larvae, but few females developed in the roots of the resistant plants and numbers of eggs in the soil were fewer after the resistant crop. In the second year, a commercial, nematode‐susceptible barley crop yielded significantly more grain following the resistant segregate. The resistant segregate, derived from Hordeum pallidum var 191, suppresses the development of Heterodera avenae pathotypes 1 and 2 [British nomenclature] and should be useful in areas where these pathotypes predominate.