When it is applied to your dog's skin, it will not only suffocate any adult mange that is present, but also the larvae and the eggs. The two worst invasive woody plants for Colorado and the surrounding region are the Russian Olive and the Tamarisk. The edge of the leaf is usually smooth, although small serrations sometimes occur. Russian olive is a deciduous multi-stem shrub or tree, growing up to around 20 feet. For large trees, cut off the branches starting at the bottom and work your way up the trunk of the tree. The Russian Olive tree, as opposed to the native American silverberry, is considered a highly invasive species in some parts of the United States and Canada.. Then work your way back down cutting the main stalk in manageable chunks. The branches of the tree are covered with sharp thorns. The Russian olive tree was introduced into North America in the late 1800s. With their sharpness and size, a hawthorn tree's thorns can cause serious wounds. The latin name of this tree is Elaeagnus angustifolia and although it looks very similar to the common olive tree, they belong to different plant families. The Russian olive is a deciduous ornamental tree that originated in eastern Europe and western Asia, and was introduced to the United States in the early 1900s. There have been cases of eye scratches from the thorns … Small Russian Olive Tree can just cut it down using a chainsaw or reciprocating saw. When pruning, heavy gloves and goggles should be worn. Russian Olive (Elaeagnus angustifolia), is native to western and central Asia. It is a nitrogen-fixing plant with spiny stems, silvery foliage, fragrant yellow flowers and forms olive-like fruit. Step 1- Cut The Tree Down.