When it comes to growing apples, no state dominates like Washington. It accounts for roughly 6 in 10 of all the apples grown in the U.S. One of the major threats facing this top crop is fire blight. The bacterial disease attacks apple and pear trees and can ruin an entire harvest, costing roughly $100 million annually in losses for the U.S. apple industry. The fire blight bacteria can also develop resistance to the antibiotic orchardists have typically used to protect their fruit trees.

But that resistance may have met its match in a compound that Washington State University microbiologist and associate professor Cynthia Haseltine calls “the universal assassin” for its ability to kill not only fire blight bacteria but also other harmful pathogens. Haseltine has spent nearly a decade developing this compound that is derived from a microbe found in extreme environments like volcanic vents and hot springs.

The compound is now being field tested for the first time in central Washington. It’s also shown promise in the lab at killing listeria bacteria which can grow on equipment in fruit packing plants.

Haseltine joins us to share details of the grant she was recently awarded to expand production and real-world testing of this novel approach to protecting Washington apples.

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News Source : https://www.opb.org/article/2026/04/24/scientist-looks-to-microbe-found-in-extreme-environments-to-help-protect-washington-apples/