Varroa Treatment for New Zealand Beekeepers

Once monitoring tells you the mites are there, and they always are in New Zealand, you treat. The products available here fall into a few groups, and the single most important habit is rotating between treatments with different modes of action so the mites do not develop resistance. This page covers what is on the shelf and how to use it sensibly, alongside monitoring and the overall varroa picture.

Synthetic strip treatments

These are strips that hang between the frames for several weeks while the bees walk past them. Apivar, based on amitraz, is the mainstay for many New Zealand beekeepers. Bayvarol and Apistan are synthetic pyrethroid strips. The catch is that varroa resistance to the pyrethroids, Apistan in particular, is now widespread across much of New Zealand, so many keepers no longer rely on them. This is exactly why rotation and after-treatment testing matter.

Organic and acid treatments

Formic acid, sold here as Formic Pro, penetrates capped brood where mites hide and is useful in an integrated programme. Oxalic acid is widely used under the own-use rules, and works best when the colony is broodless, such as in mid-winter. Thymol-based products like Apiguard use a plant-derived active and are temperature-sensitive. These organic options are valuable for rotating away from synthetics.

• Apivar (amitraz): a mainstay strip treatment for many New Zealand hives
• Bayvarol and Apistan (pyrethroids): effective only where mites are not resistant, and Apistan resistance is now common here
• Formic Pro (formic acid): reaches mites under capped brood
• Oxalic acid: own-use, best applied when the colony is broodless
• Apiguard (thymol): plant-derived, works within a temperature range

Rotation, dosing and honey

Do not lean on the same product every time. Alternate between treatments with different modes of action, commonly a strip treatment in autumn and a different one in spring, so resistance has less chance to build. Always follow the label dose and timing, remove strips on time, and observe any withholding period before putting honey supers back on so treatment residues do not end up in honey you harvest. Then test again, because a count that has not dropped means the treatment failed or resistance is building and you need to switch.