Plants in Health And Disease Being An Abstract of a Course of Lectures Deliver
Plants in Health And Disease Being An Abstract of a Course of Lectures Deliver
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8; fruit is not so highly valued as that of some of the more susceptible varieties. At the same time it ought to be quite possible to produce, by crossing, a variety which combines the qualities of disease-resistance and those most acceptable in the fruit.
Many diseases of leaves belong to the class spoken of as mildews and are caused by fungi belonging to the family Erysipkacece. The Rose mildew, caused by Sphaerotheca pannosa, is one of the most familiar of these diseases and is typical of th...e class. The diseased leaves become covered with a white, powdery growth of the fungus, which causes them to curl up and die. The fungus grows mainly on the surface of the leaves, swollen branches from the filaments acting as sucker-like organs of attachment, while other branches penetrate the outer walls of the epidermal cells and swell out within the surface cells in the form of bladder-like haustoria. These absorb food material from the cells occupied as well as from the adjoining cells. The substances thus absorbed from the living leaf are passed on to the vegetative fila- ments of the fungus outside which is thus enabled to grow and multiply.
What to read after Plants in Health And Disease Being An Abstract of a Course of Lectures Deliver?
You can find similar books in the "Read Also" column, or choose other free books by F E Frederick Ernest Weiss to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
8; fruit is not so highly valued as that of some of the more susceptible varieties. At the same time it ought to be quite possible to produce, by crossing, a variety which combines the qualities of disease-resistance and those most acceptable in the fruit.
Many diseases of leaves belong to the class spoken of as mildews and are caused by fungi belonging to the family Erysipkacece. The Rose mildew, caused by Sphaerotheca pannosa, is one of the most familiar of these diseases and is typical of th...e class. The diseased leaves become covered with a white, powdery growth of the fungus, which causes them to curl up and die. The fungus grows mainly on the surface of the leaves, swollen branches from the filaments acting as sucker-like organs of attachment, while other branches penetrate the outer walls of the epidermal cells and swell out within the surface cells in the form of bladder-like haustoria. These absorb food material from the cells occupied as well as from the adjoining cells. The substances thus absorbed from the living leaf are passed on to the vegetative fila- ments of the fungus outside which is thus enabled to grow and multiply.
What to read after Plants in Health And Disease Being An Abstract of a Course of Lectures Deliver?
You can find similar books in the "Read Also" column, or choose other free books by F E Frederick Ernest Weiss to read onlineMoreLess
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