What is the phenomenon whereby a herbicide applied to a target tree moves to non-target trees?

The concept being described is known as "flashback," which refers to the movement of a herbicide from the target tree to non-target species. This situation can occur through various processes like root uptake, soil movement, or volatile compounds evaporating and drifting. It is particularly concerning in forest management because it can unintentionally harm surrounding vegetation that we aim to protect.

Understanding this phenomenon is crucial for effective pest control and herbicide application since it emphasizes the need to apply these chemicals judiciously, minimizing off-target effects as much as possible. This also ensures that forest ecosystems remain balanced and that unintended destruction of non-target trees is avoided, which can be detrimental to biodiversity and the overall health of the forest.