The robotic pickers don't get tired and can work 24 hours a day.

"Human pickers are getting scarce," said Gad Kober, a co-founder of Israel-based FFRobotics. "Young people do not want to work in farms, and elderly pickers are slowly retiring."

FFRobotics and Abundant Robotics, of Hayward, California, are racing to get their mechanical pickers to market within the next couple of years.

Harvest has long been mechanized for large portions of the agriculture industry, such as wheat, corn, green beans, tomatoes and many other crops. But for more fragile commodities like apples, berries, table grapes and lettuce — where the crop's appearance is especially important — harvest is still done by hand.

Members of the $7.5 billion annual Washington agriculture industry have long grappled with labor shortages, and depend on workers coming up from Mexico each year to harvest many crops.

President Donald Trump's hard line against immigrants in the U.S. illegally has many farmers in the country looking for alternative harvest methods. Some have purchased new equipment to try to reduce the number of workers they'll need, while others have lobbied politicians to get them to deal with immigration in a way that minimizes harm to their livelihoods.