Formic acid treatment

Apply formic acid vapor inside the hive to kill varroa mites on adult bees and inside capped brood cells. Products like Formic Pro and MAQS (Mite Away Quick Strips) provide controlled-release formic acid pads that simplify application.

Why It Works

Formic acid vapor penetrates the wax cappings of brood cells, reaching mites during their reproductive phase -- something most other treatments cannot do. This makes it effective even when brood is present. Efficacy ranges from 50-80% depending on temperature and application method.

Tips

• Apply only when daytime highs are 50-85°F (10-29°C) -- temperatures outside this range reduce efficacy or risk bee mortality
• Expect some queen loss risk (1-2%) with flash treatments; extended-release formulations are gentler
• Formic acid is corrosive -- always wear a respirator rated for organic vapors and chemical-resistant gloves during handling