In view of the spread of potato eelworm (Heterodera schachtii) in England and Scotland in recent years, it was decided in 1935 to examine farm soils in Jersey to ascertain if these were free from the pest. In three seasons, 1935 to 1937, 180 soils, the majority from fields which had grown potatoes for 10 or more consecutive years, were tested and all of them proved to be free from potato eelworm. These results, together with observations of numerous growing crops, indicated that the Island was substantially, if not entirely, free from the pest.