under 5 mm these little critters have spread because of warmer and shorter winters.
Normally the cold winters reduce the overall insect populations because their egg clutches freeze rather than survive to hatch – be they burrowing into trees or soil.
still, it was a missed opportunity for Canada – the chemicals that kill the beetles turns the wood blue – rendering it unsellable.
Except, that it would have been the perfect blue to rebuilt New Orleans with. Timely as well from when Katrina and the rise of these Beetles.