From apple packing houses in Washington state to farm workers in Florida and a California county known as “the world’s salad bowl,” outbreaks of the novel coronavirus are emerging at U.S. fruit and vegetable farms and packing plants.

Reuters reports that a rising number of sick farm and packing house workers comes after thousands of meat plant employees contracted the virus and could lead to more labor shortages and a fresh wave of disruption to U.S. food production.

The Trump administration said last month it may extend an executive order to keep meat plants operating to fruit and vegetable producers as well, a sign it is concerned fresh produce could be the next sector hit.

While social distancing can be more easily implemented for workers harvesting fruits and vegetables in fields and working outside may reduce some risks for virus spread, plants that package foods such as apples and carrots resemble the elbow-to-elbow conditions that contributed to outbreaks at U.S. meat packing plants.

By late May, there were more than 600 cases of COVID-19 among agricultural workers in Yakima County, Washington. Of those, 62% were workers in the apple industry and other packing operations or warehouses, according to a Reuters review of data from county health officials.

With 4,834 known cases as of June 10, the county had the highest per-capita infection rate on the West Coast.

“The (production) line moves super fast. And you’re working side by side and back to back,” said Edgar Franks, political director with local farmworker union Familias Unidas por la Justicia in Washington state.

Workers at six fruit packing sites in Yakima County went on strike in May due to concerns they were not being provided adequate protection from COVID-19, Franks said.

The health department in Monterey County, California, known as “the world’s salad bowl” for its sprawling vegetable farms, reported 247 agricultural workers had tested positive for coronavirus as of June 5, 39% of county’s total cases. Monterey is one of only a handful of health departments in nearly 30 of the largest U.S. fruit and vegetable producing counties that tracks virus cases among agricultural workers, Reuters found.

On May 19 the U.S. Agriculture Department and Food and Drug Administration said the government could use the Defense Production Act to keep fruit and vegetable lines moving. The act would give companies some liability protection if workers fall sick.

An FDA spokesperson said the act could be used “to protect the food supply and prevent significant food shortages.”

U.S. Senator Debbie Stabenow, a Michigan Democrat, said in an interview with Reuters farm workers face increased risks as fruits like apples and cherries enter harvest season.

Stabenow, ranking member on the Senate Agriculture Committee, introduced legislation on May 27 that would offer companies grants and loans to upgrade machinery and purchase personal protective equipment, fund COVID-19 testing and facility cleaning.

“You can get ahead of this, which is what didn’t happen in the meatpacking situation,” she said. “The best way to protect our supply chain is to keep workers safe.”

Meanwhile, coronavirus cases near tomato-growing Immokalee, Florida, are also on the rise. The spread of the coronavirus among Florida farm workers has significant implications for national food production, as many agricultural workers travel north through the summer following the harvest through Georgia, the Carolinas, and into the Northeast.

The Florida Department of Agriculture is planning for more on-farm outbreaks by partnering with county health departments, hotels for quarantine housing, and educating workers.