Last updated: August 21, 2026
Most backyard colonies that die over winter were carrying a mite load their keeper never measured. Not ignored, not misjudged, simply never counted, because counting mites feels like an optional extra next to the visible jobs of inspecting, feeding and harvesting. It is the opposite of optional. It is the one number that tells you whether the colony has a future.
There are two sampling methods a backyard keeper realistically uses, an alcohol wash and a sugar roll, plus a passive sticky board method that answers a different question. This guide covers what each one measures, what gear it needs, how they differ in accuracy and in cost to the bees, and where to get the action thresholds that turn a count into a decision.
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Quick Answer
Alcohol wash or sugar roll for counting varroa mites?
- An alcohol wash is the more reliable of the two and the method extension services generally recommend. It kills the bee sample.
- A sugar roll releases the sampled bees alive but recovers fewer mites, so counts run lower and vary more between attempts.
- A monitoring cup that supports both methods, with molded guide lines for a standard bee sample, is the only piece of gear either method needs.
- Whichever you use, use the same one every time. Comparing a wash to a roll tells you nothing about whether your mite load changed.
Bottom line: pick one method, sample from the brood nest, and take the action threshold from an extension service rather than from a forum.
What You Are Actually Measuring
Both methods measure the same thing: how many mites are riding on a measured sample of adult bees. That figure, expressed as mites per hundred bees, is a proxy for the mite load in the colony as a whole. It is not a total mite count, because a large share of the population is inside sealed brood cells where no sample can reach.
That is fine, because the proxy is what the published thresholds are built around. What matters is consistency: same method, same sample size, same part of the hive, so that this month’s number means something next to last month’s.
The Alcohol Wash
An alcohol wash takes a sample of bees from a brood frame, immerses them in alcohol or a windshield washer fluid, and shakes so the mites detach and fall through a screen into the liquid where you can count them. It is the method extension programs point to as the most reliable, because the alcohol releases mites that a gentler method leaves clinging.
The cost is the sample. Those bees do not survive, which is the reason some keepers avoid the method. In a colony of many thousands, a single sample is a small proportion, and most keepers make peace with the trade once they have compared the two methods on the same hive.
Taking the Sample
The sample comes from a brood frame, not from a honey super, because mite levels are highest where the brood is. Find the queen first and move her frame aside, since shaking her into a wash cup ends the day badly. Then follow the sampling instructions your chosen guide sets out.
Penn State Extension and the University of Minnesota Bee Lab both publish step by step sampling procedures including the sample size and how to take it. Use their instructions rather than approximating, because a sample that is not the standard size cannot be compared against a published threshold.
The Sugar Roll
A sugar roll uses powdered sugar instead of alcohol. The sampled bees are coated, rolled so the mites lose their grip, and then shaken out through a screen along with the sugar. The bees are returned to the hive alive, dusty and unimpressed, which is the whole appeal of the method.
The trade off is recovery. A roll consistently releases fewer mites than a wash from the same sample, so counts read lower, and results vary more with humidity, technique and how thoroughly the sugar reaches every bee. It is a real measurement, it is just a less precise one.
When a Roll Makes Sense
If the alternative is not counting at all, a sugar roll is unambiguously the right choice. Plenty of keepers who cannot bring themselves to kill a sample will happily do a roll every few weeks, and a regular imperfect count beats a perfect count nobody takes.
What a roll should not be used for is comparing against a wash. If you switch methods mid season, you have broken your own baseline and the numbers on either side of the switch are not comparable.
Sticky Boards and Natural Drop
A sticky board slides under a screened bottom board and catches mites that fall naturally out of the cluster. It measures mite drop over a period rather than mite load on a sample, and it needs no handling of bees at all, which makes it the least disruptive option available.
Its weakness is interpretation. The relationship between natural drop and actual load varies with colony size, brood status and season, so a board is a useful signal rather than a decision tool. Most keepers use it between washes to watch for a trend, not instead of them.
Comparing the Methods
| Method | What it measures | Sampled bees survive | Reliability |
|---|---|---|---|
| Alcohol wash | Mites per sample of adult bees | No | Highest, and the extension default |
| Sugar roll | Mites per sample of adult bees | Yes | Lower recovery, more variable |
| Sticky board | Natural mite drop over time | Not applicable | Trend signal, not a load figure |
| Drone brood uncapping | Mites in drone cells | Drone brood is destroyed | Rough, useful as an early warning |
The Gear You Need
The One Piece That Does Both Methods
A dedicated monitoring cup is a two part container with a mesh screen between the halves and molded guide lines for a standard bee sample. It works for an alcohol wash and for a sugar roll, it does not leak in your hand, and the clear bowl makes counting straightforward instead of a squint.
The Improvised Version
A wide mouth jar with a mesh lid does the same job for the price of a jar. It is more awkward to shake, it is harder to see through once the liquid clouds, and getting a repeatable sample size out of a plain jar takes more care, but generations of beekeepers counted mites this way.
Watching Between Counts
A sticky board under a screened bottom board gives you a low effort look at what is happening between proper counts. Buy one sized for your hive footprint, and mark the date you put it in, since the drop figure only means something across a known period.
How Often, and What the Number Means
Counting once a year in a panic is not monitoring. The useful pattern is a count at intervals through the active season, with extra attention in late summer, because the bees being raised then are the ones that carry the colony through winter. Counting again after a treatment window closes is what tells you whether anything changed.
Action thresholds, the point at which a count says to act, are not a single national figure and they shift through the season. Take them from Penn State Extension, the University of Minnesota Bee Lab, Michigan State Extension or your state apiarist. Once you have a number and a threshold, the treatment comparison covers what the options actually are.
Fitting It Into an Inspection
A count adds a few minutes to a routine inspection rather than being a separate trip. Light the smoker, open the hive, find and set aside the queen’s frame, take the sample from a brood frame, and close up. The counting itself happens on the tailgate afterward.
Do it on a calm, sunny afternoon like any other inspection, and note the result somewhere that survives the season, because the value of a count is almost entirely in the comparison with the last one. Our hive inspection checklist covers slotting it into a ten minute look, and a smoker that stays lit through the process is worth more than it costs, which our smoker guide gets into.
Frequently Asked Questions
Does the alcohol wash really kill the bees? Yes, the sampled bees do not survive. In the context of a full colony it is a small sample, and the accuracy gained is the reason extension programs still recommend it over the alternatives.
Can I use rubbing alcohol or does it have to be a specific liquid? Beekeepers commonly use isopropyl alcohol or windshield washer fluid. Follow the sampling guide you are working from, and keep to the same liquid so your counts stay comparable.
What mite count means I should act? Take the threshold from an extension service such as Penn State Extension or the University of Minnesota Bee Lab, because it changes with the season and the region. It is not a fixed number and it is not something to take from a forum.
Where in the hive do I take the sample? From a brood frame, since mite levels are highest around brood. Move the queen’s frame out of the way first so she cannot end up in the sample.
How often should I count? Several times across the active season rather than once, with particular attention in late summer while the winter bees are being raised, and again after any treatment window closes.
Is a sticky board enough on its own? No. It shows a trend in natural mite drop, which is useful, but the relationship between drop and actual load varies too much for it to replace a wash or a roll.
The Bottom Line
Pick one method, buy a monitoring cup that supports it, and count on a schedule rather than on a hunch. An alcohol wash gives the most reliable number and costs a small sample of bees; a sugar roll costs no bees and gives a lower, noisier number that is still far better than nothing. Take the action threshold from an extension service, not from a conversation, then read the treatment options comparison to decide what happens next. If a vaporizer is where you are heading, the vaporizer guide covers the hardware and the protective gear.