But if you do get a peek, you won't see anything humanoid or space-aged. AgroBot is still more John Deere than C-3PO - a boxy contraption moving in fits and starts, with its computer-driven sensors, graspers and cutters missing 1 in 3 berries.

Such has been the progress of ag-tech in California, where despite the adoption of drones, iPhone apps and satellite-driven sensors, the hand and knife still harvest the bulk of more than 200 crops.

Now, the $47bn agriculture industry is trying to bring technological innovation up to warp speed before it runs out of low-wage immigrant workers.

California will have to remake its fields like it did its factories, with more machines and better-educated workers to labor beside them, or risk losing entire crops, economists say.

“California agriculture just isn’t going to look the same,” said Ed Taylor, a UC Davis rural economist. “You’re going to be hard-pressed to find crops grown as labor-intensively as they are now.”

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