What color do larvae infected with AFB typically turn?

Larvae infected with American Foulbrood (AFB), caused by the bacterium Paenibacillus larvae, typically exhibit a color change as they progress through the infection. Initially, the larvae may appear white and healthy, but as the infection develops, they undergo a noticeable transformation in color.

The correct choice describes this progression accurately, with the larvae turning from yellow to brown as the infection takes hold. The brown color signifies the decaying tissue and the breakdown of the infected larvae, often resulting in a dark, sunken appearance. The presence of this color change can be a clear indicator of AFB, aiding beekeepers in identifying and managing this serious disease to prevent its spread within their colonies. Understanding the characteristics of infected larvae is essential for bee health management and effective disease control strategies.