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Synergistic effects of P450 inhibitors (malathion and piperonyl butoxide) applied 1 h before herbicide treatment. A, Metabolic herbicide-resistant L. rigidum plants were treated with 400 g ha−1 chlorsulfuron alone (left) or with chlorsulfuron plus 1 kg ha−1 malathion (right). B, Plants were treated with 500 g ha−1 chlorotoluron (left) or with chlorotoluron plus 2.1 kg ha−1 piperonyl butoxide (PBO; right). Application of the P450 inhibitor alone had no visual effect on plant growth.
