. Diseases of bees. Bees. DIAGNOSING BEE DISEASES IN THE APIABY 19 SYMPTOMS APPEARANCE OF THE COMBS In colonies with sacbrood the brood is slightly irregular. Scat- tered here and there among the healthy brood are cells containing dead brood (fig. 12). The capping-s over dead brood are first punc- tured and later removed by the bees. The holes vary in size, and occasionally there is more than one. Sometimes the size and uniform shape of the hole indicate that the cell has never been completely capped. Dead larvae usually lie fully extended on the floor of the cell (fig. 13, B-F), showing the d
. Diseases of bees. Bees. DIAGNOSING BEE DISEASES IN THE APIABY 19 SYMPTOMS APPEARANCE OF THE COMBS In colonies with sacbrood the brood is slightly irregular. Scat- tered here and there among the healthy brood are cells containing dead brood (fig. 12). The capping-s over dead brood are first punc- tured and later removed by the bees. The holes vary in size, and occasionally there is more than one. Sometimes the size and uniform shape of the hole indicate that the cell has never been completely capped. Dead larvae usually lie fully extended on the floor of the cell (fig. 13, B-F), showing the dark-brown heads through the openings (fig. 12). When these conditions are present the dead larvae should be studied Figure 13.—Sacbrood: A, Oral view of healthy larva at the age when death usually occurs from sacbrood; B—F, stages in decay and drying of larvae dead of sacbrood. AGE OF AFFECTED LARVAE Death from sacbrood almost always occurs after the cell is capped and the larva has spun its cocoon and is motionless. At this stage the larva is fully extended on the floor of the cell. In heavily infected colonies a few coiled larvae may be killed. COLOR AND ODOR OF THE DEAD BROOD Shortly after death caused by sacbrood the color of the larva changes from the pearly white to a slightly yellowish color. This gradually becomes darker, beginning with the head and front third of the larva, which soon changes to a brown or grayish brown and later a dark brown. Scales are almost black for the entire length, the head end usually being 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
Size: 1855px × 1347px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisher, booksubjectbees
