In a previous paper the writer (1929) has given an account of the initiation and earlier work on a field plot experiment at Winches Farm devoted to the study of the stem eelworm, Anguillulina dipsaci, in its attacks on potato tubers. For the trials carried out in 1928 the original plot, which was 200 ft. long by about 21 ft. 9 ins. wide, was divided up into 30 smaller plots, each measuring 12 ft. long by 10 ft. 9 ins. wide, and 10 varieties of potatoes were tested, each variety being grown in triplicate. Following an inoculation of the soil with diseased tubers, it was found that all the varieties grown, whether earlies, second-earlies or main-crops, became infected. Since 1928 the plot has been cropped each year with potatoes and the purpose of the present paper is to put on record observations made and results obtained in subsequent years and to advance certain conclusions arrived at as a result of this work.