Avocados are seeing one of the biggest price spikes in nearly a decade, just as President Donald Trump has made recent threats to shut down the U.S.-Mexico border.

The price of Hass avocados from the Michoacan region in Mexico jumped 34 percent Tuesday, in the largest single-day gain since April 13, 2009, Bloomberg reported. And there could be more price jumps ahead, with one expert telling the publication that avocado prices "could easily double or triple" in the event of a border shutdown.

"Because California is late and it's a small crop, Mexico is accounting for nearly all of our avocados," Roland Fumasi, vice president and senior analyst at Rabobank told Bloomberg.

And that figure doesn't apply to just this year's supply of avocados. In 2017 alone, Mexico exported 1.7 billion pounds of the green fruit to the United States, growing 75 to 80 percent of the avocados that Americans eat, according to the Hass Avocado Board.

The cause for the jump in avocado pricing? Fumasi guessed that it could be due to the border issues, compounded with the fact that a heat wave in 2018 affected the outcome of this year's avocado crop in California.

Beyond Tuesday's price increase, in the event of a border shutdown, the United States' avocado supply could be gone after just three weeks, predicted Mission Produce, the world's largest avocado grower and distributor.

California's own avocado growers won't be able to compensate for the loss of product. For one, the California avocado season is just starting, said Mission Produce President Steve Barnard, telling Reuters on Monday that California has "a very small crop, but they're not relevant right now and won't be for another month or so."

Mexico also has an added advantage to growing avocados: The region is able to sustain growing avocados year-round, while other places such as California can only grow for a few months at a time.

Avocados aren't the only produce that would be affected by the border shutdown; among Mexico's other top exports to the United States are watermelons, limes, bell peppers, mangoes, papayas and strawberries, reported Business Insider.

Since his assertion Friday that he would close the southern border this week, Trump changed his tune slightly Tuesday. While not completely backing off his threat to shut the border, Trump said that "we're going to see what happens" but that he's "ready to close it" if he must.

The Associated Press and SFGATE staff writer Dave Curran contributed to this report.