Yesterday evening, I drilled four holes in my chlorotic maple and inserted Medicap FE iron supplements. The tree is leafing, although not as thickly as the two healthy ones. Last August, I injected a lot of EDDHA iron into the soil around the tree with my root feeder watering device. I think that helped; the leaves appear to be as green as the two healthy trees, but just to be sure, I did the implants after asking on GardenWeb about whether it’s possible to overdose it on iron. Sounds like it’ll be safe, so I went ahead and did it.