Can Disease-Sniffing Dogs Save the World’s Citrus?
By Katherine J. Wu/Smithsonianmag.com
Tim Gottwald will never forget the sight: the mottled yellow leaves, the withered branches, the small, misshapen fruits, tinged with sickly green. These were the signs he’d learned to associate with huanglongbing, or citrus greening—a devastating and wildly infectious bacterial infection that slashed the United States’ orange juice yields by more than 70 percent in the span of a decade.
“It’s like a cancer,” says Gottwald, a plant pathologist with the United States Department of Agriculture. “One that’s metastasized, and can’t be eradicated or cured.”
Once they’ve begun to sport splotchy foliage and stunted fruit, trees can be diagnosed with a single glance. A symptomatic plant, Gottwald says, is a diseased one. Unfortunately, the converse isn’t true: Infected trees can appear normal for months, sometimes years, before visibly deteriorating, leaving researchers with few reliable ways to suss out sick citrus early on—and giving the deadly bacteria ample opportunity to spread unnoticed.
Now, Gottwald and his colleagues may have a creative new strategy to fill this diagnostic gap—one that relies not on vision, but smell. They’ve taught dogs to recognize the telltale scent of a huanglongbing infection—an odor that eludes the attention of humans, but consistently tickles…
Carol graduated from Riverside White Cross School of Nursing in Columbus, Ohio and received her diploma as a registered nurse. She attended Bowling Green State University where she received a Bachelor of Arts Degree in History and Literature. She attended the University of Toledo, College of Nursing, and received a Master’s of Nursing Science Degree as an Educator.
She has traveled extensively, is a photographer, and writes on medical issues. Carol has three children RJ, Katherine, and Stephen – one daughter-in-law; Katie – two granddaughters; Isabella Marianna and Zoe Olivia – and one grandson, Alexander Paul. She also shares her life with her husband Gordon Duff, many cats, and two rescues.