Fig. 4

Mean and standard deviation in hourly temperature (black line) and relative humidity (grey line) (a) and Culicoides imicola numbers (black line) (b) as determined in 96 light trap collections at four sites near cattle at the ARC-OVR from 15:00 h on 7 July to 14:00 h on 8 July 2017. The C. imicola numbers collected made at the four individual sites are indicated with grey lines. Vertical black lines indicate sunset and sunrise