Abstract
Continuing the work on which a paper was published by the writer in the Journal of Helminthology, April, 1937, it was decided to concentrate on calcium chloro-acetate in the 1938 field experiments on soil treatment for the control of the potato sickness associated with Heterodera schachtii.Tests were made at five different centres in the counties of Glamorgan and Monmouth with amounts equivalent to 3 cwt. and 5 cwt. to the acre.