Medi-Caps consists of a plastic cartridge filled with iron citrate. Implant holes are drilled in the tree to place the cartridges. When implanted in the tree trunk, it releases the iron citrate into the water transport system. Cartridge spacing is based on severity of iron deficiency. Several sizes of cartridges are available.
Proper placement is important to obtain the desired results.
The Mauget system consists of a vial of 1.4 percent chelated iron that is attached to the tree trunk and releases the chemical into the tree through a needle-like tube. The tubes are placed into small holes drilled into the tree. The Medi-Ject system contains a network of plastic tubing and T's placed in drilled holes around the tree trunk so that gravity feeds an iron sulfate solution directly into the trunk. All injection systems have been field-tested and found to be effective under specific conditions. Results will vary with tree species, severity of chlorosis, time of year, soil moisture and individual tree response.