Other methods for detecting emerald ash borer
Emerald ash borer (EAB) are more attracted to stressed than to healthy ash trees. By girdling an ash tree, it will become progressively more stressed emitting chemical cues that attract EAB to it. In the fall of the year, the girdled tree is debarked to look for EAB galleries and larvae. Complete details for this method can be found in: Using girdled trap trees effectively for emerald ash borer detection, delimitation and survey.
This method is useful for detecting EAB in woodlots. It is labour intensive, since the tree must be debarked. Girdling a tree can make it hazardous, so this method should be used with caution and avoided anywhere where there are targets (people or objects that may be damaged if the tree falls).
This method, developed in Canada, uses a native wasp species, called Cerceris fumipennis, to detect EAB. Cerceris fumipennis is a solitary wasp that preys only on buprestid beetles (including EAB), which it brings back to its nest in the ground. In this method of EAB detection, the prey these wasps bring back to their nests is monitored to see if any are EAB. Preliminary studies have shown that the wasp is very effective at finding EAB. Full details of this method are described.
Aerial imagery is processed so that the electromagnetic energy reflected from objects on the ground is captured. Each object has unique spectral properties; with ground-truthing, this allows the identification of tree species and potentially their condition. Research about using HSI to detect both ash trees and EAB-infested ash trees shows promise[42,43]. This method is still being developed at present and is expensive; however, in the future may be an effective tool for tree inventory and EAB detection.