Many diseases, parasites, predators, and conditions affect honey bee colonies. In addition to pages on eXtension.org, the following resources can guide you in the identification and treatment of these issues. Pesticide rules change often, always follow the label on any pesticide.

Honey bee larvae infected with American foulbrood become a stringy mass of material that later dries and carries the spores that may infect other larvae. Photo by Virginia Williams, USDA-ARS.

Resource/link:
University of Georgia Honey Bee Disorders web-page

Materials:
Well organized images and descriptions of most honey bee disorders

Resource/link:
Mid-Atlantic Apiculture Research and Extension Consortium (MAAREC)

Materials:
Well organized images and detailed captions describing most honey bee parasites, pests, predators, and diseases

Resource/link:
MAAREC Diseases & Pests web-page

Materials:
Down-loadable fact sheets, Power-Point's, and articles

Resource:
Diagnosis of Honey Bee Diseases; Shimanuki, H. and Knox, D. A.; USDA-ARS Agriculture Handbook Number 690; Download a .pdf of Diagnosis of Honey Bee Diseases

Publication:
This handbook describes laboratory techniques used to diagnose diseases and other abnormalities of the honey bee and to identify parasites and pests. While laboratory techniques are not practical for most beekeepers, this guide provides additional, useful information.

A family of varroa mites found at the bottom of a honey bee brood cell. Photo by Scott Bauer, USDA-ARS.

Resource/link:
The Apiary Inspectors of America (AIA)

Materials/Services:
The AIA provides a list of inspectors per state that can help you with specific problems, targeted for the conditions in your state.