A mature pistachio canopy can make six feet feel consequential. Joel Siegel's earlier research found 50% fewer droplets at 14 feet than at 8 feet, a reminder that spray reaching the outside of a tree may not tell the whole story. Canopy height affected coverage.
LiDAR-equipped sprayers use measurements of the crop to adjust application as a tractor moves through the row. In intelligent-sprayer systems, the scan can guide individual nozzles in real time, matching output to canopy size and density. That is the basic logic of the technology.
Carrier volume meets canopy
APG trials evaluated LiDAR applications at 100, 200, and 400 gallons per acre in mature pistachios. The range puts a practical question in front of orchard managers: whether changing carrier volume can help get a more useful application into a large, uneven tree.
The work addresses navel orangeworm and Gill's mealybug, and reported a 30% spray reduction at 400 GPA. The trial's stated result is a reduction in spray; it does not, by itself, establish how much pest control improved in commercial blocks. The trial report describes the findings.
Honeydew is part of the late-season problem
More carrier volume may help with a job beyond delivering a pest-control product: washing honeydew from trees. That matters in late-season management, when residue on the canopy can complicate efforts to keep pest pressure in check.
For California pistachio operations, the useful test is not simply whether a sprayer can run at a higher volume. It is whether coverage and tree condition improve under the orchard's own canopy, equipment, and application conditions.
The reported findings offer a reason to evaluate the approach, not a universal setting to adopt. The available information does not establish commercial-scale efficacy across different blocks or seasons.