by Dave Scharfenberger, Board-Certified Master Arborist WI-0131B
We have been talking a lot about emerald ash borer (EAB) over the last few years. EAB is now officially in Milwaukee County, and a seven-county area in southeast Wisconsin, including Milwaukee and Waukesha counties, has been quarantined.
We have been staying up with the research and it is clear that Imidacloprid works well to control EAB. However, on larger trees, the data shows that control is inconsistent. The studies show that the amount of the product needs to be increased. This is due to the extra volume of branches and leaves in an older tree that needs protection.
We use the best products available. Imidacloprid is the product of choice for a soil-injected insecticide that will not wound the tree with injection holes. We are using an Imidacloprid formulation that has a recently updated label allowing us to increase the rate on larger trees to make up for the extra volume of branches in the tree. No other Imidacloprid product permits this.
People may say they are using the best products but the question is; are they using it at a rate that will really protect your tree? At Wachtel Tree Science, we are always staying up with the research to give you the best treatments possible.