Plant pathologist develops nursery worker training
AURORA, Ore. — Appearance and health are everything in landscaping and house plants, and Oregon’s $745 million nursery industry is particularly vulnerable to the mistakes of an untrained workforce.
Many nursery workers are Spanish-speaking immigrants with very little formal education, especially in science. Explaining what can happen within the “triangle” of host plant, invading pathogen and susceptible environment is a challenge.
Enter Luisa Santamaria, a Ph.D plant pathologist assigned to Oregon State University’s North Willamette Research and Extension Center. Part of her job takes her to Willamette Valley nurseries, where she trains workers to identify and treat plant diseases or, better yet, prevent them in the first place.
“The literacy of the people is not good,” Santamaria said. “They are smart people who want to learn, but they haven’t had the opportunity.”
Micro-biology, and the action of micro-organisms that can damage or kill nursery plants, are unfamiliar concepts to many of her workforce students.
To break through, she’s developed hands-on teaching techniques. She asks workers to take samples from their tools using cotton swabs, and apply the collected material to petri plates. Seeing the organisms that eventually grow as a result is an eye-opening experience.
“They love that,” Santamaria said. “They see they can spread disease from their tools. They understand the importance of cleaning tools.”
She said workers gain confidence as they grasp the science and recognize problems in the greenhouses. In some cases, workers may have hidden or disposed of sickly plants, fearing they would be blamed and lose their jobs, Santamaria said. With training, they take more of a front-line role in detection and treatment.
“If we have some problem, we have to know it immediately,” Santamaria said. “I introduce all those concepts to them.”
Santamaria’s work came under stronger focus recently when the USDA gave OSU a $3 million grant to battle two bacteria groups that cause severe damage to Oregon’s nursery industry. Santamaria is part of a six-person OSU team that will work on Agrobacterium tumefaciens and Rhodococcus fascians,which inflict deformities on hundreds of common landscaping plants. Deformities such as swollen tumors called galls don’t necessarily kill the host plants, but make them unmarketable for use in landscaping. The diseases are difficult to identify, in part because in early stages they sometimes mimic other problems. Crown galls can resemble a callous that forms at a grafting site. Another infection at first looks like the effect of using too much growth regulator.
Santamaria will handle the workforce training aspect of the grant. It’s a good fit for her, in part because it marks a full circle in her personal life.
Santamaria grew up in Ecuador, the oldest of seven children. Her father, Gerardo Santamaria, an agronomist with a forest engineering degree, had greenhouses at home and specialized in breeding cyclamens, perennial flowers that grow from tubers. Luisa was the only sibling who took interest in the greenhouse work, and worked with her father from an early age.
One of his jobs involved training workers, and he was pleased to see she was doing the same.
A beloved high school biology teacher — one who pushed her students and emphasized hands-on “active” learning — ignited Santamaria’s interest in micro-organisms. She excelled to the point that the USDA offered her a grant to study in the U.S. She studied and worked in Delaware and Tennessee before accepting the OSU Extension position in 2009.
Although the economic benefits of a better-educated nursery workforce might seem obvious, Santamaria said she occasionally runs into someone who gripes about the training being done in Spanish. “They should speak English,” one man told her.
Santamaria shakes off such criticism and pushes ahead. She wants to develop a manual to go with the training, and would like to see pesticide certification tests offered in Spanish as well. In the meantime, she works with nursery managers to customize training sessions.
“I love to teach,” she said.
Santamaria and her husband, Carlos Castellanos,have two grown children. Anna Sophia Castellanos and Juan Sebastian Castellanos.