Hi Planbee. this is the recipe,which uses 4 g less thymol than apiguard.The mixture is 8 grams thymol to 12 grams oil,sunflower,rape,olive or even old chip oil,multiply this measurment to make more.
warm in old pan outdoors until all the thymol crystals have dissolved then add 20 mil of this mixture to a piece of the green absorbent garden oasis(not the grey one) this is the size of a sardine tin or half pound cut comb container. two inches wide, three and a half long, and 8 mil thick. put oasis in container then put liquid on, leave overnight to soak in,will soak in better if warm.
To treat bee's cut this in half and place the two parts on top of brood frames over the brood area. reduce entrance to about 2 inches and block off any feed holes,give second treatment in twelve days and another twelve days later.
i just move the previous treatment to the outside of the brood box on the edges,some bee's chew this right away to nothing others don't touch it some just nibble the corners,makes no differene as it still works really well.
look at varroa floor the next day,mites will be dead. needs to be used in warmish weather and some bee's may hang out of entrance for a couple of days others take no notice,no bad effect on bee's or queens,helps to prevent chalkbrood, much more effective than apiguard.
I believe this was tested on around 5000 hives over a period of time in spain,i have used this and this alone for the past five years,and it does not hurt if left in.
nucs use half this dose.I also tried formic in nassenhieder evaporators and canadian blast method,good for killing queens.do not use when supers are on,can bee used on swarms as soon as queen stars to lay but before brood is sealed or if bad build up of mites in summer by doing artificial swarm and treating the broodless bee's for a short time and parent colony until all young bee's have emerged and the mites killed.
Mop up in winter with oxalic.