Notices of Insects That Are Known to Form the Bases of Fungoid Parasites
Notices of Insects That Are Known to Form the Bases of Fungoid Parasites
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In some seasons, which from their humidity are favourable for the development of the para- sitic mould, the entire crop of domesticated silkworms is rapidly destroyed by this parasite, as if by contagion ; when this occurs, it occasions a heavy loss to the rearers of the caterpillars for the purpose of collecting the silk. The chrysalides' are not subjected to the same kind of parasite, except when occasioned by artificial means.
Another kind of fungoid parasite also affects the silk- worm, whi...ch first made its appearance in France, where it became very common, in 1845 ; after which it appeared in Italy and Spain in 1854, and has now extended itself into Switzerland and South Germany. It appears that the caterpillars are not affected by it until after the second casting of the skin; and many perish without any ex- ternal appearance to the naked eye of being so attacked.
On the caterpillar assuming the third or fourth skin, it becomes weak, and of a grejrish colour, after which the insect gradually dies by the progress of the fungus ; and the caterpillar then assumes a dusky yellow colour, which per- vades the whole system, with some brown or black spots which are formed by the concentration of a series of fungoid > Bassi, Lettr.
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To quickly assess the difficulty of the text, read a short excerpt:
In some seasons, which from their humidity are favourable for the development of the para- sitic mould, the entire crop of domesticated silkworms is rapidly destroyed by this parasite, as if by contagion ; when this occurs, it occasions a heavy loss to the rearers of the caterpillars for the purpose of collecting the silk. The chrysalides' are not subjected to the same kind of parasite, except when occasioned by artificial means.
Another kind of fungoid parasite also affects the silk- worm, whi...ch first made its appearance in France, where it became very common, in 1845 ; after which it appeared in Italy and Spain in 1854, and has now extended itself into Switzerland and South Germany. It appears that the caterpillars are not affected by it until after the second casting of the skin; and many perish without any ex- ternal appearance to the naked eye of being so attacked.
On the caterpillar assuming the third or fourth skin, it becomes weak, and of a grejrish colour, after which the insect gradually dies by the progress of the fungus ; and the caterpillar then assumes a dusky yellow colour, which per- vades the whole system, with some brown or black spots which are formed by the concentration of a series of fungoid > Bassi, Lettr.
What to read after Notices of Insects That Are Known to Form the Bases of Fungoid Parasites?
You can find similar books in the "Read Also" column, or choose other free books by George Robert Gray to read onlineMoreLess
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