>It is probably more convenient to kill the drones and the mites before they
>emerge. Drone trapping combs are proven to be very effective varroacides,
>provided that all the mites are on the bees (during periods with no brood
>older than 7 days in your colonies). About 500 drone larvea in brood cells
>per kg of bees will trap during capping more than 95% of the mites from the
>bees. My private apiary (10-15 colonies, for the 4th year) as well as the
>university apiary (about 50 colonies, for the second year) are maintained
>healthy only using drone trapping combs.
 
What are drone trapping combs?
God Bless,
Kelley Rosenlund
Gainesville, Fla. U.S.A.