1. AlanR. Gemmell(1940 ). Studies in the biology and control ofHeterodera schachtii.1. A comparison of theHeterodera schachtiicyst population of two potato growing districts.Bull. W. Scot, agric. Coll.no. 139.
2. D. G. O'brien, and E. G. Prentice(1931 ). A nematode disease of potatoes caused byHeterodera schachtii(Schmidt) . Res. Bull. W. Scot, agric. Coll.no. 2.