Since the Paleolithic era, honey bees pollinated apple trees and humans picked the apples. That's about to change.

A robot inspects apple blossoms for possible pollination.
(Washington State University photo via WSJ)

Human apple harvesters must scale ladders, fend off bugs, balance on branches and twist stretchy stems to get the job done. For farmers, hiring experienced apple pickers is difficult and expensive, which is why several "universities and startups are developing specialized robots for each stage of apple production," reports Jackie Snow of The Wall Street Journal. The bots will handle everything from "pollinating the trees to fertilizing them, pruning them and harvesting the fruit."

In areas where there aren't enough honey bees to pollinate apple blossoms, "researchers have developed robotic pollinators," Snow explains. Cameras help robots find apple blossoms, and then "a mechanical arm moves in close and releases a precise burst of pollen through a nozzle. Early results are promising."

Robots used to fertilize apple orchards base their application on individual tree's needs. Snow writes, "They consider multiple indicators, including trunk diameter, canopy growth patterns and fall leaf-color changes, and use AI models to determine precise nitrogen requirements. . . . Researchers believe precisely targeting individual trees could significantly reduce overall fertilizer."

Researchers are working on robots that can also prune. "The robots must evaluate the entire structure of each tree, analyzing branch length, angles, thickness and spacing to determine which cuts will promote ideal growth patterns."

To harvest apples, robots need to be gentle and nimble. "Researchers at Washington State are testing inexpensive, fabric-based robots that have three silicone fingers that close around apples," Snow explains. So far, their research has been in a lab "with fake trees and fruit. . . The system will face its first orchard trials during the next harvest season, in the fall."