Figure 1. Tick challenge in different grazing systems and agro-ecological zones, Mbale District. A.The challenge of individual tick species, Rhipicephalus appendiculatus (RA), R. evertsi (RE), Amblyoma varigetum (AV), Boophilus decoloratus (BD). B. Mean challenge of all tick species in different zones and grazing systems. C. Mean number of standard ticks under different grazing systems in three zones.