The combined use of nematicidal soil fumigants and solubilized chemicals

1. The first experiment showed that there is a considerable loss of DD vapour from the surface layer of soil, and that this loss is only moderately reduced by using a water seal or a non-gas-tight seal of foil. The effect of this is to leave a residue of potato root-eelworm “survivors” in the top 2 inches of soil and so to make DD less effective than it would be if the loss could be prevented.2. The second experiment showed that the survivors could be dealt with by treating the soil surface with a micellar solution of p-m cresol, solubilized by the method of Staniland and Stone. It also established the fact that the two treatments behave independently at all levels: there was no interaction between them.