. Diagnosing bee diseases in the apiary. Bees Diseases Diagnosis. 18 CIRCULAR U. S. DEPARTMENT OE AGRICULTURE quently much more intense. It can sometimes be detected as soon as a decayed larva is removed from the comb, and can also be detected in the dry scales. A reliable symptom of this disease is a reddish-brown color and ropy consistency of decayed brood, particularly when accompanied by a pronounced putrid odor. SACBROOD Sacbrood is caused by a filterable virus, an organism so small that it will pass through a porcelain filter and cannot be seen under the most powerful microscope. Infecti
. Diagnosing bee diseases in the apiary. Bees Diseases Diagnosis. 18 CIRCULAR U. S. DEPARTMENT OE AGRICULTURE quently much more intense. It can sometimes be detected as soon as a decayed larva is removed from the comb, and can also be detected in the dry scales. A reliable symptom of this disease is a reddish-brown color and ropy consistency of decayed brood, particularly when accompanied by a pronounced putrid odor. SACBROOD Sacbrood is caused by a filterable virus, an organism so small that it will pass through a porcelain filter and cannot be seen under the most powerful microscope. Infection in the case of sacbrood takes place by way of the alimentary canal. Both worker and drone brood rnav be affected. It has not been definitely determined. Figure l: •nib heavilv infected with sacbrood. showing numerous dead larvae. whether or not queen larvae are killed. Pupae are killed occasionally but adult bees are not affected. IMPORTANCE Sacbrood is a widely distributed disease, but it usually does not cause serious losses. It is important, however, for beekeepers to recognize sacbrood so that it will not be confused with the foulbrood diseases. Sacbrood may appear at any time during the brood-rearing season, but it is most common during the first half of the season, and prac- tically always subsides after the main honey flow has started. In ordinary case- the colonies are not noticeably weakened by sacbrood. but in exceptional cases, when 50 percent or more of the brood is affected, they mav be considerably 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 Burnside, C. E. (Carlton Earl), 1896-; Sturtevant, Arnold Parker, 1889-. Washington, D. C. : U. S. Dept. of Agriculture
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