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Impacts of CO2 and temperature on aphid (Acyrthosiphon pisum) abundance (number per plant) when feeding on M. sativa plants growing in (A) non-supplemented and (B) Si supplemented soil. Mean values ± standard error shown (N = 20) with statistically significant effects indicated ∗∗∗P < 0.001. Significant factors shown as per Figure 1 legend.
