The size and color of the foliage may tell a great deal about plant's condition, so make note of these and any other abnormalities. 7- Think about current and past management practices. Sometimes plant's current problem is actually a result of something that happened to it much earlier. Changes in grade, the use of pesticides, or nearby construction work may all contribute to tree problems. The method used for a particular insect problem will depend on the species involved the extent of the problem, and a variety of other factors specific to the situation.
Insects can cause considerable damage to trees and shrubs.
By boring into the trunk and branches, they interfere with sap flow and weaken the tree structure to a point where it may be easily clown over by the wind. Insects may also carry disease by providing an entry way for fungi, bacteria and viruses. Therefore, killing all insects without regard to their kind and function can actually be detrimental to tree health. Insects from each group have characteristic patterns of damage which will help you determine the culprit and the proper way to get rid of it. Always consult a tree care expert if you have any doubt about the nature of the insect problem or the proper way to eliminate it.