Extreme cold may wipe out high percentage emerald ash borer larvae
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Here’s one resident who may welcome the extreme cold wave headed for Minnesota. Your local ash tree.

The extreme temperatures moving in with Sunday’s arctic blast may kill off a significant percentage of emerald ash borer larvae, according to one of the premier forestry experts in Minnesota.

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Winter mortality for emerald ash borer is definitely temperature dependent. The larvae can supercool to a certain point, but they die if they freeze, and there is variability in tolerance among individual insects. A recent study from the Forest Service (Venette and Abrahamson–see attached) in Minnesota showed that 5% of the insects die at 0F, 34% at -10F, 79% at -20F and 98% at -30F.

 

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