Chemical Treatments
Acarine Treatment
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This product is not registered for use in the U.K.

Folbex VA

General note on chemicals: I do not endorse or advise on chemical treatments, as I am not qualified to do so and there may be dangers beyond my control. New products may be introduced or existing ones withdrawn, so it is difficult to keep up with current information on a website such as this. As many of the chemical pages were generated by Dave Cushman, I am leaving the content mainly as left by Dave for historical purposes only, which may mean information is out of date and unreliable. The user should seek guidance from other sources and satisfy themselves regarding safety and legality. Roger Patterson.

Manufactured By:-

Ciba-Geigy Agrochemicals, Whittlesford, Cambridge CB2 4QT. Tel: Cambridge (0223) 833621
®Registered trade mark of CIBA-GEIGY Limited, Basle, Switzerland.

Data Sheet Ref... EL943502/0504X

Date of Issue of Data... 1985

Folbex inner packet  The outer pack contains three of these slip cases that each contain a sachet of eight fumigation strips.

Fumigant strips for the diagnosis and control of honey bee mites.
Each strip contains 370 mg w/w bromopropylate.

The diagrams
have been prepared to mimic the original black and white ones.

General Information

The smoke given off by the smouldering strip contains bromopropylate, which controls the mites causing Acarine disease (Acarapis woodi) and varroa mites (Varroa jacobsoni), whilst being well tolerated by treated bee colonies. The smoke has no adverse affect upon the queen, or upon stores of pollen or honey.


Control of Acarine disease and varroa infestations of bees.

Folbex VA preparations

Method of Application

The treatment is given in the evening when the bees have ceased flying. Each hive should be prepared beforehand by adding, below the crown board, an empty shallow super in which the glowing fumigant strip can be hung vertically on a piece of wire in the space above the combs. The distance between the glowing strip and any part of the hive should be at least 30 mm (1.2") - Fig. 9.

Folbex VA Fig. 1

In the evening when all the bees have returned - Fig. 1

Close the hive entrance - Fig. 2

Hang the strip and light the unattached end, blowout the flame and replace the hive roof - Fig. 3

Folbex VA Fig.2

Leave the hive undisturbed for 1 hour.

Check the hives for fire risk and complete combustion of the strip and then open the entrance - Fig. 4

If the strip has failed to burn out completely repeat after 24 hours.

Folbex VA Fig.3

The empty shallow super can be removed on the following day.

Bees must have access to uncapped food during treatment - Fig. 5

All colonies of an apiary should be treated simultaneously.

Folbex VA Fig. 4

Acarine disease

Treatment for the control of Acarine disease is best carried out in warm weather in the spring or early summer period, as an annual precautionary measure, although treatments may be carried out when the diagnosis of the infestation is made.

Folbex VA Fig. 5


Four to six applications of one fumigant strip per colony at intervals of 7 days.

For swarms and nuclei with six or fewer occupied standard combs: half a fumigant strip at each application.

Folbex VA Fig. 6

Varroa disease:- Diagnosis and Treatment

The treatment for diagnosis and control of varroa mites should be preceded by the fitting of testing trays in the bottom of all hives (for the collection and subsequent identification of mites dropping off the bees).

Folbex VA Fig. 7


Treatment for diagnosis of varroa infestations may be performed when the colonies are at the beginning or end of brood rearing (spring and autumn), when brood rearing activity is low - Fig. 6.


For a colony of seven or more occupied standard combs -

Folbex VA Fig. 8

Diagnosis of varroa disease:

Two applications of one fumigant strip per colony at an interval of 4 days.

Control of varroa disease:

Four applications of one fumigant strip per colony at intervals of 4 days.

For swarms and nuclei with six or fewer occupied standard combs: half a fumigant strip at each application.

Folbex VA Fig. 9

Method of Application... As described above under Acarine disease.


Bees should not be treated during the main nectar flow.

Treatment should not be carried out when there is a risk of night frost or if the outside temperature is below 10┬░ C (50┬░ F) - Fig. 7

Bees should not be treated when they are tightly clustered in winter - Fig. 8

There must be sufficient room for the bees to space out - Fig. 9

This product is cleared under the UK Government's Pesticides Safety Precautions Scheme for use as directed.



Highly Flammable warning


WASH HANDS before meals and after work.

DANGEROUS TO FISH. Do not contaminate ponds, waterways or ditches with chemical or used container.
STORE IN ORIGINAL CONTAINER, tightly closed, in a safe place.

I neither endorse nor condemn this product. The information as published here is a matter of public record. The information is placed here for the education of those that wish to read it.

BEFORE you obtain or use the material concerned please ascertain the legality of doing so in your location as the product may or may not be approved in your geographic State or Country.

At the date of writing this webpage, this product was not licenced in UK or available from the appliance trade.

Dave Cushman.

Originally written by Dave Cushman. Edited and additions by Roger Patterson.

Page created pre-2011

Page updated 12/12/2022