Bob writes:
> Tylosin has no effect on EFB.

According to my source, this is NOT TRUE

EFB is caused by nonspore-forming bacteria that are transferred throughout the colony via housekeeper bees as they remove dead larvae. It is also spread by beekeepers using contaminated equipment and robber bees. Young larvae ingest EFB bacteria and die within four days of egg hatch. EFB is most common with increased brood rearing in the spring. The severity of the disease may vary from one hive to the next. EFB can seriously retard colony growth, although the infection usually goes away on its own, especially as summer begins. Strong honey flows help honey bees overcome EFB.  

CHEMICAL CONTROL: Treat with the antibiotics terramycin or tylosin. 

SOURCE:

Professor Rick Fell
Virginia Polytechnic Institute and State University
Department of Entomology

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