Veterinary Medicines for Bees

Bee health products are all the authorised veterinary medicines, diagnostic and monitoring tools, and protective equipment used to protect honey bee colonies from diseases and pests. Used correctly, they save colonies; used incorrectly, they breed resistance, leave residues in honey and wax, and mask the problem. The basic principle is simple: first measure and diagnose, use only authorised products according to their label, then measure the result again and record it.

What groups do bee health products fall into?

The pages in this section deal with products according to their purpose. Here is an overall map:

Why should only authorised products be used?

Every veterinary product to be used on bees must be authorised for bees in that country. With an authorised product:

• the dose and method of application have been tested, and the effect on the bees and the colony is known.
• its residue behaviour has been studied, and withdrawal conditions relating to the honey harvest have been set.
• the packaging states the active substance, quantity, expiry date and authorisation details; responsibility is clear.

Home-made strips, medicines made for other animals, mixtures recommended online and unlabelled "bee medicines" are products of uncertain dose and unknown residues. They harm the bees, make the honey unsaleable and speed up resistance.

Before treating: measure and diagnose

No medicine is used without knowing what the problem is and how big it is. The basis for decisions is mite counts for varroa, the matchstick test and, if needed, a rapid diagnostic kit for brood diseases, and microscope examination for nosema. Treatment carried out without measuring is either unnecessary or aimed at the wrong target.

Rules for using products correctly

1. Read the label and follow it: quantity, duration, method of application and temperature conditions must be exactly as stated on the label.
2. Stick to the timing: no medicine is applied while supers are on or a honey flow is under way; the withdrawal period on the label is observed.
3. Pay attention to temperature: organic acids and thymol are temperature-sensitive; in the wrong weather they are either ineffective or harm the colony.
4. Remove products when the time is up: strips and pads must not be forgotten in the hive; a product whose effect has worn off gives the mites a continuous low dose.
5. Treat the apiary as a whole: treat all colonies in the same apiary in the same period; if possible, coordinate with neighbouring beekeepers.
6. Measure the result again: if the expected effect is missing, look into application errors, reinfestation or resistance.

Managing resistance

Using the same active substance for years leads to the build-up of mites resistant to it. Varroa resistance to pyrethroids and amitraz has been reported in many parts of the world. To delay resistance:

• rotate active substance groups; change the mode of action, not the product name.
• make organic acids a regular part of the programme; no lasting resistance to them has been reported.
• use non-chemical methods such as drone brood removal, brood breaks and splits.
• avoid under-dosing and strips left in for too long.

Residues: protecting honey and wax

Some fat-soluble acaricides (especially pyrethroids and coumaphos) accumulate in wax; when the wax is melted down and made into foundation, they return to the hive. Residues in honey destroy the value and trustworthiness of the product. To prevent residues, don't treat while supers are on, observe the withdrawal period on the label, renew old dark combs regularly and buy foundation from a reliable source. If in doubt, have honey and wax tested in a laboratory.

Preventive equipment is a health product too

Many health problems are prevented not with medicines but with simple equipment: an entrance reducer limits robbing and the spread of disease, a mouse guard prevents winter damage, a clean hive tool and disposable gloves reduce the carrying of brood diseases from hive to hive, and foundation and regular comb renewal stop disease agents from building up.

Storage, safety and records

• Storage: keep products in their original packaging in a cool, dry place, away from children, food and bee feed. Don't use out-of-date products.
• Personal protection: organic acids are corrosive; use acid-resistant gloves, safety goggles and, when necessary, a mask with a suitable filter.
• Waste: dispose of used strips, pads and packaging according to the label instructions; don't throw them away in the apiary or on the ground.
• Records: for each hive, write down the product, active substance, date, duration and before-and-after counts. In many countries this record is compulsory; it is also the only way to spot resistance and residue problems.

An honest look at support products

Vitamins, probiotics, plant extracts and "immune-boosting" feed additives are widely sold. The evidence that these products meaningfully improve colony health is limited and inconsistent. None of them can replace varroa control, adequate pollen and nectar, clean comb and water. If you use them, choose products that state their contents clearly, don't rely on treatment claims and judge their effect with your own measurements.