Beekeeping Blog

Practical guides, treatment schedules, and app comparisons to help you manage your hives better.

Varroa Management
varroa managementoxalic acid

Summer Varroa OA Timing: The August 15 Broodless Window

August 1–15 was the SERP-wide "no later" line for summer oxalic-acid vaporization, and that window has closed for 2026. Miss the broodless window and OA efficacy drops from ~95% to under 50%. Here is the decision guide — the three-signal check, the 5-day protocol, and the two escape hatches when capped brood is still present. Treating later than this? See the fall thresholds instead.

Aug 7, 202610 min readRead