A bug smaller than a penny just became wine country’s biggest headache. The glassy-winged sharpshooter, an invasive insect recently discovered on grapevines sold at Costco stores across Northern California, has agriculture officials sounding the alarm and growers bracing for potential disaster.
Here’s the threat: this tiny pest spreads Pierce’s disease, a bacterial infection that causes grapevines to yellow, dry out, shrivel, and ultimately die. It’s a slow death sentence for vineyards—and once it takes hold, there’s only one option: rip out every infected vine and start over. Wine grower Nello Olivo knows the stakes.“If that gets infected, Napa, for example, it’ll just kill all the vines,”he said.“Then at that point, they got to get rid of it. And the only thing they can do is just tear it all up.”
The contamination originated from a Fresno County nursery, and the affected plants—Burchell Nursery grapevines and other plants—were sold at Costco locations between April 21 and May 21. Sacramento County agricultural officials say the infested plants could still be sitting in customers’homes and backyards right now. That proximity to residential areas isn’t just a backyard problem; it’s a threat to the entire regional grape industry.
Sacramento County, Yolo, Napa, Sonoma, Marin, and Solano counties are all on alert. For Sacramento County especially, the concern cuts deep—the region’s massive grape-growing industry depends on healthy vines. Officials aren’t taking chances. If you bought grapevines or Burchell Nursery plants during that window, don’t plant them, move them, or toss them. Instead, isolate them and call your local agricultural commissioner’s office. Agricultural inspectors can respond the same day and will remove the plants and place monitoring traps as a precaution.
Wine growers like Olivo have dealt with pests before—his vineyard contends with mealybug issues that cause similar vine-killing damage. But the scale of a potential glassy-winged sharpshooter outbreak looms larger. Agricultural crews are already deploying yellow sticky traps and monitoring tools throughout vineyards to catch the pest early. For now, it’s a race against a very small clock.
The ripple effects of even a localized outbreak would be staggering. Torn-up vineyards mean lost livelihoods, disrupted production, and years of replanting and recovery. That’s not hyperbole—it’s happened before in California. The state’s wine and grape industries are among the most economically vital in agriculture, and one successful colony of glassy-winged sharpshooters could rewrite the economic landscape of the region.
About the Author
Andrew Johnson
Andrew Johnson is a contributor to LocalBeat, covering local news and community stories.
