312 
Pilzkrankheiten der Pflanzen 
MUNERATI, 0. et HITLER, h., Sur l’attaque du blé par la carie. 
Influence de l’époque de la semaille (Journ. Agric. Part. 
1912, 76, T. IL, Nr. 42 [Oktober], 494—496). 
Munerati teilt Versuche mit, die den Einfluß der Saatzeit auf den 
St ein brandbefall des Weizens dartun sollen. Leider wird nur das 
Datum der Aussaat angegeben, ohne daß näheres über die klimatischen 
Verhältnisse während der Keimung des Weizens mitgeteilt würde. Hitier 
weist zum Schluß darauf hin, daß es unmöglich sein wird, den Weizen¬ 
steinbrand durch Wahl einer bestimmten Saatzeit zu vermeiden, daß 
vielmehr eine Beizung steinbrandhaltigen Weizens unerläßlich sei. 
Riehm (Berlin-Dahlem). 
BAKER, S. M., Note on a new treatment for silver-leaf disease 
in fruit trees (Ann. Bot. 1913, 27, 172). 
“The well-known phenomenon of ‘auto-digestion 1 shown by the fruit 
bodies of most species of Coprinus forms the theoretical basis for the 
treatment to be described. From the specific nature of enzyme action it 
is to be expected that a parasitic fungus has evolved tissues which are 
not destroyed by the enzymes used to dissolve the tissues of its host and 
conversely that an enzyme which destroys the fungal mycelium will leave 
the host untouched.“ It seems probable that a very powerful enzyme, 
capable of destroying the fungal mycelium, exists in the fruit bodies of 
Coprinus. The work which has begun on Silver-leaf Disease is an 
attempt to use this enzyme as a curative agent. The silvered condition 
of the leaves of an affected plant and the fact that the symptoms appear 
in the living branches before their invasion by the fungal mycelium makes 
the disease “particularly well adapted to test the treatment.” The treat¬ 
ment consists in hypodermic injections of a concentrated water extract 
from the deliquescing fruit bodies of Coprinus sp. Besides the injections 
there is external application of the same extract after the manner of a 
poultice, at the points of the wood where fruit bodies of Stereum pur¬ 
pureum make their appearance. One experiment is described. “One 
Victoria Plum tree, which has been treated with injections for two 
years, showed no silvering on the leaves of the upper parts of the branch 
in the autumn of 1912. When treatment was commenced, this branch, 
the last survivor of the five main branches of the tree, was badly affected 
throughout: it has now borne fruit in the two successive seasons, after 
a sterility of three years standing, and has produced remarkably vigorous 
new growth. The lower parts of the branch near the infected dead wood, 
still showed slight silvering on the leaves last autumn.” The investigator 
is going to extend the treatment to other fungal diseases of plants and 
animals. J. Ramsbottom (London). 
GÜSSOW, H. T., Der Milchglanz der Obstbäume. (Zeitschr. f. 
Pflanzenkrankh. 1912, 22, 385—401; 1 Fig., 2 Taf.) 
Der Ansicht vieler Pathologen (Prillieux, Sorauer, Aderhold, 
Delacroix), daß der „Milchglanz“ der Obstbäume eine physiologische Er¬ 
krankung sei, stehen die auch vom Verf. bestätigten Befunde von Percival 
und von Pickering entgegen, nach denen der Pilz Stereum purpureum 
Pers. die Krankheit verursacht. Die vom Verf. an gesunden Bäumen 
mit Sporen, Mycel und Teilen der Fruchtkörper des Pilzes gemachten 
