Borers are the one most damaging insects to trees. Severe infestations can result in the loss of a tree. There are many types of borers, most are moth or beetles. They both lay their eggs on trees and their larva burrow in and can cause extensive damage. As they mature into adult they leave the tree. This is when you notice holes and sometime sawdust.
So what do you do to prevent or treat them. The best defense is to keep your trees healthy. A healthy tree is much less likely to be damaged by borers. Trees suffering from drought, over-watering, poor soils and mechanical injury will be more susceptible. Also, there are certain trees that are prone to certain borers. A tree that is stressed or with visible signs of borer activity need chemical control.
The two most common products to treat for borers are Imidacloprid (Found in Fertilome Tree and Shrub Systemic Drench) and Permethrin (Found in Hi-yield 38 Plus and Indoor/Outdoor Broad Use Insecticide). Imidicloprid is applied as a drench around the base of the tree. It travels up the tree's vascular system and lasts for up to one year. Permethrin is applied on the trunk and large branches of the tree at regular intervals throughout the summer. It works by killing the borer as they emerge from the tree and prevents eggs from being laid on the tree, breaking the life cycle.
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