UF scientist to investigate strategies to control major tomato disease


Tomatoes represent a $1.9 billion-a-year crop planted on 330,000 acres across 18 states, but diseases such as bacterial spot can threaten them.

A University of Florida scientist has been awarded a $5.8 million federal grant to study how to mitigate this disease.

“Bacterial spot of tomato is a major challenge to commercial production throughout the United States and threatens long-term sustainability of tomatoes, because we lack sufficient control measures,” said Gary Vallad, a UF/IFAS professor of plant pathology.

Vallad, a faculty member at the Gulf Coast Research and Education Center, is principal investigator for the grant, funded by the USDA National Institute of Food and Agriculture.

He will lead a team of five other UF/IFAS faculty for the Florida part of this project. Because this is a national project, 19 scientists from across the country will augment the UF/IFAS research by also studying ways to better control bacterial spot of tomatoes.

The problem lies less with farmers and more in how bacterial spot is managed along the production chain – from seed to field production, Vallad said. The technology is there: next-generation sequencing coupled with improved disease detection methods so the research team can follow the bacterium that causes the disease throughout the production cycle. New sources of disease resistance to improve tomato varieties for farmers.

To conduct the research, Vallad and his colleagues will sample strains of bacterial spot from commercial transplant facilities that produce tomato seedlings for farming.

With his research, Vallad wants to reduce economic losses throughout the fresh-market and processing tomato industries. He has these goals for the project:

  • Work with breeders to develop varieties with increased resistance to bacterial spot.
  • Produce effective and safe bactericidal materials to limit bacterial spread and the development of resistant bacterial strains.
  • Develop strategies to help prevent disease outbreaks.
  • Improve capacity to identify and track new strains of the disease.

Results of the research may prevent needless applications of copper-based chemicals to help control bacterial spot, which helps address environmental concerns over the accumulation of copper in soils. It also can save money for growers, Vallad said.

“Giving farmers the tools and resources to tackle diseases like bacterial spot helps minimize their reliance on chemicals, thereby reducing unwanted impacts to the environment, while providing consumers a better U.S.-grown tomato,” Vallad said.


The mission of the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) is to develop knowledge relevant to agricultural, human and natural resources and to make that knowledge available to sustain and enhance the quality of human life. With more than a dozen research facilities, 67 county Extension offices, and award-winning students and faculty in the UF College of Agricultural and Life Sciences, UF/IFAS brings science-based solutions to the state’s agricultural and natural resources industries, and all Florida residents.

ifas.ufl.edu  |  @UF_IFAS


Avatar photo
Posted: October 13, 2022

Category: UF/IFAS
Tags: Bacterial Spot, Bacterium, Environment, Fresh-market, Gary Vallad, Grant, Plant Breeding, Plant Pathology, Strains, Tomatoes, Transplant Facilities, USDA-NIFA

Subscribe For More Great Content

IFAS Blogs Categories