The diseases of the sweet pea

 
9781130946741: The diseases of the sweet pea
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ...this it would seem that it is the cell contents of the host which may in some eases modify the physiological hahits of an organism. To refute the above statement it could not be argued that the sweet pea can be infected by all species of Gloeosporium. This is not the case, since experiments have proven that only the organisms which infect the apple can also infect the sweet pea, with the above exception. The writer hopes to continue experiments along these same lines with the object of finding out whether certain other supposedly different species of the Glomerella type are not one and the same. Mode of Infection and Period of Incubation. The anthracnose of the sweet pea is mainly a disease of the tender parts of the plant. Infection starts at the tips and the fungus works downwards invading both stems and leaflets until it reaches a node on the older parts of the stem, where it is stopped in its course. It is not infrequent, however, to find whole branches dying, and sometimes the entire plant is involved. In such cases it has been found that the plant is suffering from insect attacks, either by plant aphids (Aphis sp.), or more especially the red spider, (Tetranychus bimaculatus Haw.). These help the fungus both by weakening the host plant and by distributing the spores over its surface. The spores when germinating have no difficulty in penetrating the oldest parts of the host if it has been punctured by these insects. This explains why the plants suffer most during the hot dry weather, since at that time the aphids are most abundant. Infection often begins with the blossoms at the junction between the flower and the peduncle, in which case the blossom shrivels. The pods, also, even those which are nearly ripe, are often seen to be badly affected. Here, t...

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