Question: I have misused a weedkiller and now my trees are suffering. Can I do anything to reverse the effects?

Answer: Keep the plants moist at all times, so the concentrations of the herbicide in the soil are kept as diluted as practical, and avoid any high-nitrogen fertilizer that might cause the trees to grow too rapidly. There are probably no heroic measures for you to use, but you might contact the manufacturer for their specific suggestions.