. The culture of the mulberry silkworm. Silkworms. DISEASES OF SILKWOKMS. 31 sometimes with the head turned towards the base. Again, especially in case of gattine, the worm wanders restlessly here and there, seek- ing as it were power to eject the silky matter, but too impotent to do more than throw out a scanty thread to weave a web or veil of a cocoon, in which it generally falls and dies. Eggs free from disease and capable of resistance to disease are the prime requisite in guarding against flacherie and gattine. The moment some deaths are noticed, proceed as follows: (1) Change beds imme-
. The culture of the mulberry silkworm. Silkworms. DISEASES OF SILKWOKMS. 31 sometimes with the head turned towards the base. Again, especially in case of gattine, the worm wanders restlessly here and there, seek- ing as it were power to eject the silky matter, but too impotent to do more than throw out a scanty thread to weave a web or veil of a cocoon, in which it generally falls and dies. Eggs free from disease and capable of resistance to disease are the prime requisite in guarding against flacherie and gattine. The moment some deaths are noticed, proceed as follows: (1) Change beds imme- diately, briskly .shaking the worms; (2) place the worms on disinfected shelves; (3) burn the diseased and suspected worms that do not mount on fresh beds; (4) if possible move the whole rearing to another room previously aired and disinfected, and also aired after disinfection: (5) do not feed during the three or four hours in which the change is being made; (6) keep up a little wood smoke in the room; (7) give a few scanty meals of light leaf; and (8) diminish the temperature a little. CALCINO, OR MUSCARDINE. This disease, at first, has no visible appearance, but by degrees the vitality of the worm is impaired, and it eats and moves slowly. The body turns rose-colored or red, beginning with the stigmata, and then contracts and loses its elasticity, after which the worm stands still as though paralyzed, and finaly dies 20 to 30 hours from the appearance of the first symptoms. After death the body dries up and is covered with a white efflorescence, causing it to look like a stick of white chalk (fig. 15); hence the name of the disease. Calcino is caused by a mold or minute fungus. There are two varieties of this fungus: Botrytis lassiana and B. tenella. They both attack the worm in the same way. The spores of the mold by chance get on the body of the worm when it is in a molting condition, and there take root, pene- (Redrawn from Veraon trating below the skin. The thread-like m
Size: 1283px × 1947px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectsilkworms, bookyear19
