Figure 4.

Correlation between automated video tracking and human observations. M. persicae behaviour was measured by automated video tracking (x-axes) and human observations simultaneously (y-axes). Three categories of probes were distinguished: All probes, Long probes (>15 min), and Short probes (<3 min). The duration (min) and number of probes measured by human observations were compared to: (a,d,g,j,m) the duration (min) and number of probes (all, long, and short probes) measured by video tracking, (b,e,h,k,n) the total time not moving (min), and (c,f,i,l,o) the distance moved by the aphids (cm) (*P < 0.05; **P < 0.01; ***P < 0.001, Pe = Pearson correlation test, Pl = Pearson correlation test on log transformed data, S = Spearman correlation test, dashed lines represent a hypothetical r² = 1, n = 16 recordings of 1 aphid for 55 min, 275 pixels per mm²).