DIAGNOSING BEE DISEASES IN THE APIARY 



EFFECT UPON THE COLONY 



The strength of a recently infected colony will not be noticeably 

 affected, and there will be only one or a few dead larvae or pupae 

 in sealed cells with slightly discolored or sunken cappings. The 



Figure 3. — Symptoms of American foulbrood : A, Normal capping over healthy larva ; 

 B-F, stages in the discoloration and removal of cappings ; G, capping removed to show 

 healthy larva ; H—L, stages in the decay and drying of larvae killed by American foul- 

 brood : oral views. 



disease may not develop to a critical stage and seriously weaken the 

 colony until the following year. At other times, however, the 

 disease may advance more rapidly and seriously weaken or kill the 

 colony the first season. If the disease has been present and active 



