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Trees and shrubs need more than just sunlight and water. That's where arborists take over. Arborists perform many different tasks for trees and shrubs, some for the sake of maintenance and others for the tree's health and well-being.
All trees need some amount of pruning to control their shape; sometimes limbs are trimmed if they interfere with power lines, if they cross property lines, or if they grow too close to houses and other buildings. Arborists may use tools such as pruning shears or hand and power saws to do the actual cutting. If the branches are especially large or cumbersome, arborists may rope them together before the sawing begins. After cutting, the branches can be safely lowered to the ground. Arborists may use ladders, aerial lifts, and cranes to reach extremely tall trees. Sometimes, arborists need to cable or brace tree limbs weakened by disease or old age or damaged by a storm.
When cities or towns plan a new development, or wish to gentrify an existing one, they often consult with arborists to determine what types of trees to plant. Arborists can suggest trees that will thrive in a certain environment. Young plantings, or immature trees, are more cost effective and are often used, though sometimes, larger, more mature trees are transplanted to the desired location.
A large part of keeping a tree healthy is the prevention of disease. There are a number of diseases that affect trees, among them anthracnose and Dutch elm disease. Insects pose a potential threat to trees, and have done considerable damage to certain species in the past, by boring into the trunk or spreading disease-causing organisms. Bacteria, fungi, viruses, and disease-causing organisms can also be fatal enemies of trees. Arborists are specially trained to identify the insect or the disease weakening the tree and apply the necessary remedy or medication. Common methods prescribed by arborists include chemical insecticides, or the use of natural insect predators to combat the problem. Arborists closely monitor insect migrations or any other situations that may be harmful to a species of tree.
When a tree is too old or badly diseased, arborists may choose to cut it down. Arborists will carefully cut the tree into pieces to prevent injury to people or damage to surrounding property.
Trees, especially young plantings, often need extra nourishment. Arborists are trained to apply fertilizers, both natural and chemical, in a safe and environmentally friendly manner. Arborists are also hired by golf courses and parks to install lightning protection systems for lone trees or mature, valuable trees.
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