Micro injections are used to inject a tree with different types of chemicals. This is usually done because we can't inject the root system due to lack of root zone area, or if the tree is in 911 stress and needs immediate attention. An ISA certified arborist can come out and look at your tree to determine what needs to be done. Common reasons for injections: Fertilizer (lack of nutrients, or needs a "green up"), Insecticide, Fungicide, and anti-biotic applications