Trunk injection of trees is a way to treat many different insect and disease problems, as well as nutrient deficiencies, in an efficient and environmentally friendly way. With spraying becoming more and more controversial, direct trunk injection is a way to more safely deliver insecticides, fungicides, and nutrients into the functional active xylem. Also, some trees are too large to spray, in areas too close to houses, parks, water courses, or other environmentally sensitive areas where spraying is not a viable option, or the root system may be inaccessible for soil systemic treatments, making trunk injection the best or only option available in such cases. Arborcare uses the Arborjet trunk injection system which can be used on ornamentals, and both deciduous and evergreen trees. The Arborjet system is safer, utilizing a closed system that does not harm the applicator, soil, or air. It also uses the smallest microinjection possible, creating the smallest wound profile of any current system. The Arborjet system uses the Arborplug, a one way port with a self sealing, surgical septum that prevents product from leaking back out of the injection site. The Arborplug also limits wounding and speeds healing by inhibiting decay or infection, and provides a bio-neutral surface for cambial and bark tissue to grow around. Some of the common insect, disease, and nutrient problems that can be treated by trunk injection include, but may not be limited to, Bronze Birch Borer on birch trees, Elm Bark Beetle and Elm Leaf Beetle on elm trees, various types of borers and bark beetles on pines, spruce, firs, and cedars, aphids and plant bugs and many different types of trees, Locust Borer on black locust and its cultivars, Ash/Lilac borer on ash trees, anthracnose on sycamores, Dutch Elm Disease on American elms, iron chlorosis on maples, and other micronutrient deficiencies in many other types of trees.