Tordon was applied to our banks to control poison ivy in 2017. We started noticing trees turning colors and leaves curling shortly after. Is Tordon used as a weed control or will it kill off surrounding trees?
Tordon is highly toxic to most woody plants through root absorption. It also has a long residual activity in the soil, possibly a year or more based on the amount applied (application rate). It is not intended or labeled for use near desirable landscape vegetation. There is no "antidote" for Tordon injury and affected plants may eventually die. At this point, irrigating the plants during periods of prolonged dry may aid recovery. Irrigation will prevent moisture stress from compounding the effects of the herbicide.
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