Extremely-cold temperatures could bring one positive result. When the thermometer drops past 20 degrees below zero the emerald ash borer larvae will begin to die. The invasive bug has killed millions of ash trees in the upper-Midwest. If the larvae die, they won’t lay their eggs next summer. It’s not all good news and it won’t stop the problem. It’s possible the larvae which survive will become more tolerant of the cold and develop into a super-bug.
