. The fungi which cause plant disease . Plant diseases; Fungi. Recent tests by Westerdijk â '" indicate the absence of such biologic specialization in regard to hosts as is found in the Erysiphe and elsewhere. S. nicotianae Oud. & Kon.'*'' ^- parasitize;; the leaves and stems of tobacco. It is possibly identical with S. libertiana. S. trifolioruin Erik.^^-^" In general this resembles S. libertiana with which it is by some regarded as iden- tical; sufficient evidence has, however, not been adduced to prove them the same. The sclerotia, varying in size from that of a mustard seed t
. The fungi which cause plant disease . Plant diseases; Fungi. Recent tests by Westerdijk â '" indicate the absence of such biologic specialization in regard to hosts as is found in the Erysiphe and elsewhere. S. nicotianae Oud. & Kon.'*'' ^- parasitize;; the leaves and stems of tobacco. It is possibly identical with S. libertiana. S. trifolioruin Erik.^^-^" In general this resembles S. libertiana with which it is by some regarded as iden- tical; sufficient evidence has, however, not been adduced to prove them the same. The sclerotia, varying in size from that of a mustard seed to a pea, are found in the de- cayed tissue, or as larger fiat surface sclero- tia. No conidia except the functionless gonidia. Unknown on clover. S. bulborum (Wak.) Rehm *^ which is very similar to S. trifoliorum and without known conidia grows on hyacinth, crocus, scilla and tuhp. Cross infections be- tween hyacinth and clover have not, however, been successful and the species may be dis- tinct. A sterile form, Sclerotium tuliparum, found on the tulip may also belong here. S, tuberosa Fcl. is found on wild and culti- vated anemones. Several other species of the genus, arriong them S. alni Maul, S. betulae Wor., S. aucupa- riae Ludw, S. crategi Magn., are found on Ericaceae, Betulacese, Rosacese, Graminea, etc., but they are not of sufficient economic importance to w^rant further notice here. Fig. 99.âCultures uf .scle- rotinia from tobacco on potato agar, showing sclerotia. After Clinton. Fig. 100.âC. senig- inosum. /. ascus; K, ascospores; L, conidia. After Rehm and Bre- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, Frank Lincoln, 1871-1934. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
