Prior to field application, the viability of each nematode preparation was determined microscopically by counting
the number of motile and dead infective juveniles in a fixed number of fields of view at 603 magnification.
Immobile nematodes exhibiting movement when probed with a dissecting needle were viable. In trials 1 and 2, nematode viability was used to adjust for the desired field rate selected for experimentation. In trial 3, the field rate was calculated based on the number of nematodes designated on the label. See Table 1 for a summary on nematode viability and other factors relating to the field trials.