Observational analysis reveals root grafts lead to herbicide translocation in sweetgum trees, indicating precautions needed.
Backflash mortality of untreated trees was observed in New Jersey sweetgum stands where 2,4,5-T had been applied with injectors in experimental thinnings. Translocation of the herbicide from treated to untreated trees was attributed to root grafts, verified by excavation. Injector thinnings still seem feasible, so long as treated stems are at least 1½ feet away from crop trees.
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Richard H. Fenton (1965) studied this question.
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