. Diagnosing bee diseases in the apiary. Bees Diseases Diagnosis. 16 CIRCULAR 3 9 2, U. S. DEPARTMENT OF AGRICULTURE DISTRIBUTION AND RACES OF BEES AFFECTED This disease has been found only in limited sections of North Caro- lina, South Carolina, Georgia, and Florida. All the races of bees common in North America are susceptible, but Italians appear to be more resistant than are common blacks and hybrids. Weak colo- nies are usually more seriously affected than strong ones, but heavy losses of brood may also occur in strong colonies. EFFECT UPON COLONIES Parafoulbrood progresses rapidly within
. Diagnosing bee diseases in the apiary. Bees Diseases Diagnosis. 16 CIRCULAR 3 9 2, U. S. DEPARTMENT OF AGRICULTURE DISTRIBUTION AND RACES OF BEES AFFECTED This disease has been found only in limited sections of North Caro- lina, South Carolina, Georgia, and Florida. All the races of bees common in North America are susceptible, but Italians appear to be more resistant than are common blacks and hybrids. Weak colo- nies are usually more seriously affected than strong ones, but heavy losses of brood may also occur in strong colonies. EFFECT UPON COLONIES Parafoulbrood progresses rapidly within some colonies and se- riously weakens or kills them. In others it progresses slowly, the colonies are not noticeably weakened, and the disease disappears of its own accord. Some colonies clean out the dead brood promptly, while in others it is allowed to accumulate. In some apiaries only a few colonies will be diseased, while in others every colony will be. Bw^^.^m IMP wf w)wi w®W$w? ⢠*- "⢠^*ippp_ __ â ii^.â¢^^?^jpw Figure 11.âParafoulbrood ; a heavily infected comb showing larvae in various stages of disease and decay after death. affected. Loss caused by parafoulbrood may vary from the weak- ening of a few colonies to the loss of entire apiaries. This disease usually appears in the spring and disappears by midsummer, but oc- casionally colonies exhibit symptoms of the disease throughout the year, or there may be a slight increase of infection in the autumn. The first brood reared in the spring is not affected. SYMPTOMS APPEAEANCE OF THE COMBS Infected combs resemble combs with European foulbrood. The brood is more or less irregular, depending upon the amount of infection and the length of time the disease has been active (fig. 11).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Burns
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