Figure 7. Relative chlorophyll content of leaves in top (L1), medium (L2), and low (L3) canopy positions of mite-infested (+M) and control (–M) crops in Season 1. Measurements were taken in basal and distal leaf sections. Error bars are 2 SEM and asterisks indicate mite effects: *P < 0.05, **P < 0.01, ***P < 0.001. See "Methods" for an explanation of SPAD units.