Honeybee Diseases and Pests

This table describes all of the main honeybee diseases and pests. Some, like the Bee Louse and Small Hive Beetle, are not yet a problem in the Inland Northwest. Clicking on “photos” will open up a new window with excellent photos from Zachary Huang of Michigan State University.

Disease/Pest
Cause
Symptom/Effect
Treatment
ChalkbroodFungus
Ascophera apis
photos
Mummified larvae

White or black
None registered
NosemaProtozoan
Nosema apis
photos
Dysentery, reduced lifespan reduced ability to feed larvaeFumagillin
American Foulbrood (AFB)Bacteria
Paenibacillus larvae
Dead larvae/pupae on back, extended tongues, “ropy” condition, dried brittle scales, sunken cappingsTerramycin
Burn infected frames
European Foulbrood (EFB)Bacteria
Melissococcus pluton
Dead larvae all positions, slight ropiness, rubbery scales, sour smellNone registered
break in brood cycle
Tracheal mitesAcarapis woodi
photos
Spring crawling, k-wings, reduced adult longevity, colonies die in early spring, microscopic examinationMenthol
Formic gel
Varroa mitesVarroa jacobsoni
photos
Visible mites, deformed wings, reduced longevity, colonies die any time, PMS (parasitic mite syndrome)Fluvalinate, Coumaphos, Formic gel, Sugar ester
Sacbrood, Paralysis, etcVarious viruses
photos
Various, shiny black, trembling, larvae become sacs of fluid, reduced life span of adultsNone registered
Small Hive Beetle (SHB)Aethina tumida
photos
Larvae destroy combs, feed on pollen/honey, adults in hive, pupae in soilSection 18 Coumaphos
Wax MothsGalleria mellonella & Achroia grisella
photos
Visible damage, cocoons, moths, galleriasisStrong colonies
Stored equipment may be treated with paradichlorobenzene, freezing, carbon dioxide
Bee LouseBraula coeca
photos
Larval tunnels under wax, adults on bees, especially queensNone registered, but Fluvalinate kills them
Stone broodAspergillus sp.Larvae and pupae turn into hard stone — like mummiesno treatment
SkunksScratched entrance boards, dwindling populationSkunk Boards
MiceMice in hives, comb destructionMouse entrance guards