Skinner, Ernest B. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XV, Part I (1904)
Christman, A. H.
Observations on the wintering of grain rusts, pp. -107 PDF (3.0 MB)
OBSERVATIONS ON THE WINTERING OF GRAIN RUSTS. A. H. CHRISTMAN The manner in which grain rusts pass the winter in northern climates and in regions where the barberry is wanting, is still considered an open question. Eriksson and Henning (1), while they record the germination of uredospores collected during the winter and early spring, conclude that these spores and the mycelia producing them play no important part in perpetuat- ing the fungus. As is well known, they hold that rust may be transmitted as a nonhyphal, so called, mycoplasm in the cells of the host. It is quite possible that their adherence to the my- coplasm hypothesis on other grounds has biased their judgment on the question of the ability of uredospores and mycelium to pass the winter. Ward (2) rcjects the mycoplasm hypothesis entirely and probably most gyologists regard it with great skepticism. On account of the position taken by Eriksson and Henning, it may be well to review some of the earlier observations re- corded as bearing osn this question. As early as 1875 Kuhn (3) found uredospores of P. graninis Pers. in the early spring near Halle, in Germany, and in same year Nielson4 concluded that in Denmark, P. rubigo-vera 1). C., passes the winter as a myce- 1Ericksson and Henning,-Diie Getreideroste Stockholm, 1896. 2Ward, H. M. On the Histol. of U. dbispersa, Erikss;., and the "My- coplasm" Hypothesis. Phil. Trans. Roy. Soc., Vol. 196, p. 29, '03. 3Uber die nothwendigkeit eines Verbotes der Pflanzung und Anlage der Berberitzenstrauches. Kuhn J. Landw. Jahrb. Bd. 4, 1875, p. 399. 4 P. Nielsen,-De for Landbruget farligeste Rustarter og Midlerne mod dem. Ib., 1875, Bd. 1. I ,,,,:,-,%I-f ,;: 11,":il, -w:,- - hl.---, -S- I I
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