Same Robot, Very Different Results: Why UV-C Dose on the Plant Matters More Than the Spec Sheet

Two strawberry crops. Same robot, same lamps, same settings.

On one, UV-C reached the edges well but barely touched the middle. On the other, it was strong in the middle and almost absent at the top and bottom. Same machine, opposite problems, and none of it could be predicted from the specification sheet.

UV-C is becoming a serious tool for strawberry growers. Delivered at the right dose during the night, it can significantly reduce powdery mildew pressure and help cut back on chemical sprays. The lamps and robots are improving every year. But the part that actually determines success is still rarely measured: not what the lamp emits, but what the plant actually receives.

Over recent weeks I have been measuring real delivered UV-C doses directly on crops, under normal operating conditions. The results were eye-opening.

In the first crop, dose was strong on the outside but dropped sharply toward the center and crown. The plants were open and wide, so a single-direction pass simply didn't build up enough. Running the row in both directions fixed it, while keeping the canopy open so the inner leaves still received light.

In the second crop the situation was reversed: strong dose in the middle, almost none at the top and bottom. This crop was dense and planted tightly, leaving no room for the lamp to sit at a proper distance from the canopy. The energy was there, but crop geometry prevented proper coverage.

These small but critical factors, canopy density, planting distance, travel direction, exposure time, can make the difference between an effective treatment and a false sense of security. A grower can watch the robot pass with lamps glowing and believe the job is done.

The crop may tell a different story.

None of this is a criticism of the technology. Both issues were solvable with practical adjustments to canopy management and treatment strategy rather than new hardware.

But they only became clear once we measured what was actually happening on the plant.

This is the work we do at CropTIQ.

We measure real delivered UV-C dose on the crop and help growers turn those insights into better results. If your UV-C treatments are not delivering the expected disease control, that gap is exactly what we examine.

If you're running UV-C robots or developing them, feel free to get in touch.

Happy to talk through your situation.