96 
Pflanzenkrankheiten 
portalis . Stecklinge von brennerkranken Reben wurden unter Glas so 
trocken als möglich cultiviert, um zu sehen, ob vielleicht durch Stecklinge 
die Krankheit übertragen werden kann, indem das Pilzmycel etwa in den 
Stamm der Rebe übergeht. Trotz mehrjähriger Cultur in trockener Luft, 
ohne Betauung und Regen und bei sparsamstem Gießen trat niemals 
auch nur ein einziger Brennerfleck auf. Das Auftreten der Krankheit 
ist also jedenfalls auf eine jedesmalige Neuinfection zurückzuführen. 
Die speciell niederösterreichische Rebenkrankheit „Droah“, cha- 
racterisiert durch starke Wachstumshemmung der Internodien und Blätter 
sowie Abfallen der Blüten, ist eine winterliche Austrocknungserscheinung 
und keine Pilzkrankheit. Matouschek (Wien). 
FAWCETT, H. S., Two fungi as causal agents in Gummosis of 
Lemon trees in California [Botrytis vulgaris and Pithia- 
cystis citrophthora] (Monthly Bull. Stat. Comm. Hort. 1913, 2, 
Nr. 8, 601-617; figs. 12). 
These two organisms, known to produce Rots of the fruit, have been 
found to produce gummosis on species of Citrus , the Lemon being the 
most susceptible the Sweet Orange next and the Sour Orange least 
of all. The exudation of gum, which indicates the presence of the disease, 
is to be regarded as the result of the disease rather than the actual disease 
itself. The disease is further indicated by the occurrence, especially on 
the trunk, of dead areas of bark. Inoculations, made by transplanting 
diseased material obtained from the advancing edge of the diseased areas, 
were successful, whereas wlien the diseased tissues were already permeated 
witli gums they always failed to produce infection when transplanted to 
healthy tissues. 
Pure cultures of both fungi when used for inoculation also induced 
the development of gummosis. 
Flooding the trunks of the trees or burying the bud union below 
the soil is favorable to the development of the disease because Pithia- 
cystis citrophthora is known to live in the soil. In the treatment of the 
disease it is first necessary to remove the diseased bark or in case the 
diseased area is large it may be more desirable to isolate it by removing 
Strips of bark. A Bordeaux paste is then applied to inhibit the 
spreading of the disease. This paste consists of one pound of copper 
sulphate dissolved in one gallon of water; two pounds of quick lime 
slaked in one half gallon of water; stir together when cool and apply 
with a brusli. F. A. Wolf (Auburn, Ala.). 
ANONYMUS, Coffee disease in East Africa (Ivew Bull. 1913,168—171). 
The recent recognition in Uganda of the coffee disease caused by 
Hemileia vastatrix necessitated a re-examination of the Hemileia material 
from Tropical East Africa. The records quoted support the view that the 
fungus may be endende in Africa and may not necessarily have been 
introduced with the imported coffee. The disease is now widely spread in 
the Protectorate and in German East Africa and Uganda, but as yet there 
is no record of its occurrence in Nyasaland or in any part of the West 
Coast of Africa. The examination of the type specimen of H. Woodii on 
leaves of supposed Coffea Ibo from German East Africa has shown that 
the diseased leaves do not belong to that species nor to any known species 
