Green spaces are extremely beneficial for city inhabitants. They supply oxygen, reduce other noxious elements, and also have an aesthetical value….Trees are the most important element in these green areas, but they sometimes remain neglected. However, they need constant attention and care. Thus, it is of great importance to know the problems that could affect them. Tree condition in cities (compact soils, etc.) is not adequate for their development so they can be subjected to the attack of several biotic agents. If these organisms are not controlled, they can seriously affect plant health and balance.