Fungoid pests of cultivated plants / by M.C. Cooke.

  • Mordecai Cubitt Cooke
Date:
1906
Catalogue details

Licence: In copyright

Credit: Fungoid pests of cultivated plants / by M.C. Cooke. Source: Wellcome Collection.

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    It has been recorded in France, where it was first discovered, and afterwards in Italy and Great Britain. Sacc. Syll. iii. 2804 ; x. G818. Another species, with round pale spots, margined by a narrow bright brown ring (Scptoria noctiflone), occurs on SUenc noctiflora in America. One species without any definite spots (Scptoria clianthicola) attacks the leaves of Sweet Williams and Pinks in Italy and Portugal. Another affects the leaves of Saponaria (Septoria Saponar'ue) in France, Italy, and Germany, in which the spots are pallid and rounded or irregular, the sporules being more robust than usual. The leaf-spot most prevalent in Europe, S. Africa, and Australia (Scptoria Dianthi) is not recorded for Britain. (See Journal R.H.S. 1902, PI. I., f. 3.) Large Dianthus Spot. * Scptoria Sinarum ( Speg.), PI. II. fig. 31. This leaf-spot seems hitherto to have been confined to the leaves of Dianthus sinensis, which are blotched with large and somewhat rounded whitish spots, often occupying the greater part of the leaf, and without any definite margin. The receptacles are scattered over the upper surface of the spots. The sporules are of the threadlike type, but very short for fungi of this kind (20 25 x 2-2^ p). The species was first found in Italy, but has since migrated to Britain. Sacc. Syll. iii. 2802. We may just mention Septoria dianthophila which affects the stems of Dianthus Caryophyllus in Brazil. Two species are recorded as selecting specially the calyces of Dianthus for their host. One of these is named Scptoria Carthu- sianorum, and occurs in Belgium ; whilst the other is called Septoria calycina, and is given as Belgian also; but except in the names we fail to detect any difference between them, and suspect that it is the same parasite described independently by two different persons. Carnation Anthkacnose. Gheosporium Dianthi (Cooke). During the spring of 1902 Carnations in several localities were attacked by this pest before it could be found in fructification and described, as it would appear to be an entirely new pest. The leaves are at first spotted with small purple roundish spots. These gradually enlarge and become confluent and indeterminate, and at length brownish in the centre. Meanwhile the leaves become sickly, and commence to die off' at the tips. The pustules are not to be distinguished by the naked eye, and scarcely by the aid of a lens. Cells beneath the cuticle supply the place of definite receptacles, and in them a large number of elliptical hyaline sporules (10—12 x 5 /•) are produced, which
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