Pflanzenkrankheiten. 543 



phloeocoptes Nal. zurückzuführen ist, wäre interessant zu untersu- 

 chen. An Blättern dieses Obstbaumes zeigten sich öfters die Beu- 

 telgallen von Eriophyes Padi Nal. 



V. Krankheiten und Beschädigungen des Beeren- 

 obstes: In Mähren breiten sich aus Sphnevotheca mors uvae 

 Berk., Botrytis (auch auf Erdbeeren) und Gloeosporium Ribis. Erio- 

 phyes ribis Nal. trat stark auf. 



V. Krankheiten und Beschädigungen der Wald- 

 bäume: Um Brunn befiel sonderbarerweise Chrysomyxa abietis 

 Wattr. nur stellenweise die Fichten; benachbarte Bäume blieben 

 ganz intakt. Periäermiiim Pini acicola und der Eichen mehltau grei- 

 fen um sich Agaricus inelleus gedeihte im Herbste sehr gut. Die 

 auftretenden Gallen werden verzeichnet. 



Auf die tierischen Schädlinge weiters einzugehen, ist hier nicht 

 der Ort. Matouschek (Wien). 



Barrus, M. F., Late blight and rot of potatoes. (Circ. Cor- 

 nell Univ. agr. Exp. Stat. XIX. p. 77-83. 7 f. 1913.) 



Referring to Phytophthora infestans. Trelease, 



Blodgett, F. M., Hop Mildew. (Bull. Cornell Univ. Exp. Stat. 

 CCCXXVIII. p. 281-310. ill. Mar. 1913.) 



Referring to Sphaerotheca Humiüi. Trelease. 



Breidahl, H. G. and A. C. H. Rothepa, Bitter Pit, and Sen- 

 sitivity of Apples to Poisons (Proc. Roy. Soc. Victoria. 

 XXVII. 2. p. 191—197. 1914.) 



In reply to Ewart's criticisms of the work of Rothera and 

 Greenwood on the action of bitter-pit tissue on diastase, the 

 authors maintain: 



1) That Ewart's tannic acid complications are not applicable 

 to the experiments of Rothera and Greenwood. 



2) That Ewart is incorrect in assigning the tannic acid retar- 

 dation to an action upon the starch. 



3) That Ewart's results were obtained under different condi- 

 tions and with different proportions of reagents, and are therefore 

 not applicable to the experiments of Rothera and Greenwood. 



Experiments in support of their position are given in detail. 



E. M. Wakefield (Kew). 



Brooks, F. T., A Disease of Plantation Rubber cause d 

 by Ustulina Sonata. (New Phytologist. XIV. p. 152—164. 1915.) 



The author found that a not uncommon root disease of Hevea 

 in the Federated Malay States is due to Ustulina Sonata {l^€y.) 

 Sacc. a fungus which is known as a parasite on tea, but has hitherto 

 been only doubtfully suspected of parasitism on Hevea. The disease 

 attacks chiefly old trees. The collar is first affected, and subsequently 

 neighbouring lateral roots and the portion of the tap root imme- 

 diately below the collar becomes infected. In bad cases the disease 

 may spread upwards in the trunk. Infected trees gradually die, 

 unless successfully treated in an early stage of attack. 



Successful inoculations through wounds were obtained with 

 four-year-old trees and with seedling rubber plants. In one case 



