. The culture of the mulberry silkworm. Silkworms. 30 THE CULTURE OF THE MULBERRY Fig. 13.—Worm which died of flacherie, putrefying after death. (Redrawn from Pasteur.) these micro-organisms, in the majority of cases, pla}7 a prominent part in the development of flacherie, it is well to guard against them. The principal causes of flacherie are: (1) Eggs being spoiled through careless preservation; (2) hereditary tendency; (3) overfeed- ing of worms; (4) wet, sweating, dewy, and fermented leaf; (5) leaf submerged in water or full of mud; leaf from a new plantation or from a shaded sp
. The culture of the mulberry silkworm. Silkworms. 30 THE CULTURE OF THE MULBERRY Fig. 13.—Worm which died of flacherie, putrefying after death. (Redrawn from Pasteur.) these micro-organisms, in the majority of cases, pla}7 a prominent part in the development of flacherie, it is well to guard against them. The principal causes of flacherie are: (1) Eggs being spoiled through careless preservation; (2) hereditary tendency; (3) overfeed- ing of worms; (4) wet, sweating, dewy, and fermented leaf; (5) leaf submerged in water or full of mud; leaf from a new plantation or from a shaded spot, coarse leaf, or change of leaf; (7) lack of ventila- tion; (8) excessive heat; (9) dust; (10) keeping Worms too thick on trays; (11) accidental deaths of worms from injuries, these putrefy- ing, and the ferments thus created being co m m uni- Jmk^mk£^ cated to other worms; (12) debility. If these causes are avoided, flacherie is not likely to invade a rearing. To prevent contagion eggs should be dipped in a solution of sulphate of copper before being incubated; and in cleaning shelves and nets, wherever a dead worm is seen, powdered sulphate of lime or copper should be applied. Unlike the corpuscles of pebrine, the microscopic organisms, which are probably the immediate cause of flacherie, remain alive from one year to another, and the dust of a rearing room ma}^ contain them in considerable quantities and become the means of infection. Hence, in cases of flacherie, immediately after the rearing, the walls, shelves, and all the implements should be washed in a solution of chloride of lime or some other germicide, and the room should be fumigated with sulphur. GATTINE. The external signs of gattine are indifference to food, torpor, dysen- tery, and emaciation. It attacks the worm in the first ages, and is especially manifested after a molt. Some- times it is associated with flacherie, and, in its incipient stage, is confounded with this disease. Later the worm becomes ext
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsilkworms, bookyear19
