90 
Pilzkrankheiten der Pflanzen 
liELTIlER, Die Fußkrankheit des Weizens (D. Landw. Presse 1913, 
40 , 780). 
—, Beobachtungen über die Fußkrankheit des Weizens (Ill. Landw. 
Ztg. 1913, 33, 589—591). 
An der Hand practischer Beispiele aus seiner Berufstätigkeit als 
landwirtschaftlicher Wanderlehrer in der Rheinpfalz erörtert Verf. die Ur¬ 
sachen der dort immer weiter um sich greifenden als Fußkrankheit 
zusammengefaßten verschiedenen Krankheiten. Was Verf. als Bekämpfungs- 
maßregeln anführt, sind nichts als allgemein gültige, auf eine sorgfältige 
Bewirtschaftung hinzielende Vorschriften, bei deren Befolgung sich infolge 
Kräftigung der Pflanzen natürlich in gewissem Grade gegen jede Krankheit 
Erfolge erzielen lassen. W. Fischer (Bromberg). 
PETHYBRIDGE, G. H., Investigations on Potato diseases [Fourth 
report] (Journ. Depart. Agric. and Techn. Instruct, for Ireland 1913, 
13, 25 pp.; 6 pi.). 
Although the weather during the earlier part of the season of 1912 
was fairly good for the potato crop, that of the greater part of the 
summer was correspondingly bad. From about mid-July to the beginning 
of September there was practically a succession of wet, cool days and 
nights. The experiments of the previous season on Phytophthora infestans 
were continued. “Owing to the fact that the blight is by no means the 
only serious disease which affects the potato crop in the west, it has 
always been very difficult to obtain reliable quantitative results in plot 
experiments on spraying.” In spraying experiments it was “found that 
the best result was obtained when the plots were sprayed twice, starting 
at the normal time (about the middle of June). The next best result 
was given by spraying three times, starting at the normal time, and this was 
closely followed by the plots sprayed three times, starting early (end of May). 
A considerably worse result was given by spraying twice, starting early, 
while the worst result of all was contained by spraying twice, starting late 
(mid-July).” These results are somewhat at variance with those obtained 
during the two previous seasons. This discrepancy is probably due to 
some extent to the nature of the weather conditions but a serious dis¬ 
turbing factor of unknown and varying proportions is the prevalence of 
Sclerotinia sclerotiorum which is practically uninfluenced by spraying. 
With regard to the relative efficiencies of Bordeaux and Burgandy mixtures 
there seems on the whole a very small advantage in favour of the former 
shown in a slightly increased yield of healthy tubers. No difference could 
be seen between the amount of attack on the foliage and stalks in the 
two cases. In experiments to test the efficacy of different strengths of 
spraying solutions it was found that “a mixture, in the preparation of 
which only one per cent, of copper sulphate was used, proved practically 
as efficacious as a two per cent, mixture, thus confirming in a wet season 
the result obtained in the previous dry one”. Steeping seed tubers in 
spraying mixtures before planting was again found worse than useless. 
A hundred blighted tubers were planted, 38 of which died in the ground 
and the remaining 62 produced plants of varying degrees of robustness 
but all perfectly healthy and free from any trace of Phytophthora This 
confirms the results of previous years. The three varieties “Shamrock”, 
“Clifden Seedling” and “Champion II” again showed high resistence to 
