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Phytotoxic effect of unguinol on C4 plants. (A) Five microliters of formulation (0.5% DMSO and 0.08% Uptake in MeOH); (B) 0.5 μg unguinol leaf−1 (lowest dose tested); (C) 50 μg unguinol leaf−1 (highest dose tested). Plants were photographed 48 h after application.
