Glossary
An organic acid treatment for varroa mites that is unique in its ability to penetrate capped brood cells, killing mites that are reproducing under the wax cappings. Formic acid is applied through extended-release pads (MAQS or Formic Pro) that release acid vapor into the hive over a period of days.
Formic acid vapor, released within the hive from gel-based pads, permeates through the beeswax cappings that seal developing brood cells. Inside these sealed cells, varroa mite foundresses are actively reproducing. By reaching mites under cappings, formic acid achieves higher overall efficacy than contact-only treatments that can only reach mites on adult bees.
Commercial products like MAQS (Mite Away Quick Strips) and Formic Pro are designed to release formic acid at a controlled rate over 7-14 days. The treatment can be applied with honey supers in place, an important advantage for beekeepers who need to treat during nectar flows.
Formic acid is temperature-sensitive. Application during temperatures above 85 degrees Fahrenheit can cause excessive vapor release, potentially killing the queen or causing colony absconding. Most product labels specify optimal application temperatures between 50 and 85 degrees Fahrenheit.
Queen loss is a more common side effect of formic acid treatment than with other miticides (estimated at 2 to 5 percent of treated colonies). This risk is higher in hot weather, with newly mated queens, and in small colonies. Despite this risk, many beekeepers consider formic acid essential because of its unique ability to reach mites under cappings.
Yes. MAQS and Formic Pro are labeled for use with honey supers on, making them one of the few varroa treatments that can be applied during nectar flows. Formic acid is a natural component of honey at low concentrations.
Do not apply formic acid treatments when daytime highs exceed 85 degrees Fahrenheit, as high temperatures cause rapid vapor release that can damage brood, kill the queen, or cause colony absconding. In Florida, this limits formic acid use to cooler months.
When applied correctly within label temperature ranges, formic acid achieves 85-95 percent mite kill, including mites under cappings. This makes it one of the most comprehensive single treatments available. However, temperature sensitivity means real-world results vary more than with some other treatments.
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