Two groups of 40 ewes from each of two flocks were used in a field trial of the efficacy of dicyclanil to protect them against a natural infestation by Wohlfahrtia magnifica larvae, when administered topically as a spray-on formulation. The animals of one group in each flock were treated with dicyclanil and those of the other group were left untreated as controls. The trial lasted 31 weeks and the animals were inspected daily for wohlfahrtiosis. The incidences of wohlfahrtiosis ranged from 17˙5 per cent to 20 per cent in the control groups and from 2˙5 per cent to 5 per cent in the treated groups, and 77˙8 per cent of the infestations were in the genitalia. When compared with the control groups, dicyclanil achieved a 100 per cent reduction of infestation in the treated groups of both flocks for at least 24 weeks, and an 80 per cent reduction for 31 weeks.
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