Spot The Difference: Decoy Beetles Created To Manage The Invasive Emerald Ash Borer

An Emerald Ash Borer (left) and a manufactured Emerald Ash Borer decoy (right) created by researchers  at Penn State University  © Penn State News via Flickr (CC-BY-NC-ND 2.0)
An Emerald Ash Borer (left) and a manufactured Emerald Ash Borer decoy (right) created by researchers at Penn State University © Penn State News via Flickr (CC-BY-NC-ND 2.0)

The emerald ash borer (Agrilus planipennis) is a beetle native to Asia which was first identified near Detroit, Michigan and Ontario in 2002. It is now a serious invasive pest of North American ash trees in the genus Fraxinus. Emerald ash borer populations are spreading rapidly in the Midwest and Mid-Atlantic states of the USA, as well as adjacent regions of Ontario, Canada. “Within 25 years, practically no ash trees may remain on either side of the St. Lawrence Seaway”, said Akhlesh Lakhtakia, Charles Godfray Binder Professor of Engineering Science and Mechanics at Pennsylvania State University.

Emerald ash borer adult males locate females using visual cues, and males can be attracted by using dead male or female beetles pinned to host trees. The beetles are in the family Buprestidae, also known as Jewel Beetles as they often have metallic, iridescent colouring. Thomas Baker, Professor of Entomology at Pennslyvania State University and Michael Domingue have previously used dead female emerald ash borers for bait to trap the male beetles. The dead emerald ash borers are not ideal for trapping due to their fragility, therefore two researchers working in Lakhtakia’s laboratory have created a decoy beetle made from a mold of the female beetles body. The decoy has been coloured using a process of layering polymers with different refractive light properties to create the characteristic iridescent green colouring of the emerald ash borer. The team were able to find the right combination of polymers and number of layers in order to refract light and create a colour very similar to the beetle’s own colouring, creating a realistic visual decoy.

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It’s a Dog’s Life- The Rescue Dogs Being Trained To Detect The Emerald Ash Borer

Ash tree Fraxinus pennsylvanica killed by the Emerald Ash Borer Agrilus planipennis © Steven Katovich, USDA Forest Service (CC-BY-3.0-US license, via Wikimedia Commons)

While most dogs spend their days running around and playing with toys, 5 dogs from a Montana based organisation Working Dogs for Conservation are hard at work aiding scientific research and conservation by combatting the invasive Emerald Ash Borer beetle Agrilus planipennis, one of the most destructive non-native insect pests in the USA. The Emerald Ash Borer was accidentally introduced into the USA and Canada in the 1990’s and has since spread to 14 states with devastating consequences for ash trees. It has been estimated that the Emerald Ash Borer infestation will likely eventually encompass 25 states with estimated treatment, tree removal and replacement costs of $10.7 billion. The biggest risk of spreading the invasive ash borer is by the movement and trade of ash products, timber and firewood infested with larvae which are concealed within the wood and notoriously hard to detect.  Continue reading