44 Pflanzenkrankheiten. 



spraying was carried out with Ammoniacal Copper Carbonate, which 

 keeps the fruit clean. 



Bordeaux mixture was not tested on account of the difficulty 

 of obtaining pure unslaked lime during the rains. 



E. M. Wakefield (Kew). 



Dastur, J. F., The Potato Blight in India. (Mem. Dep. Agric. 

 India. VII. 3. Bot. Series. p. 1—14. 1 pl. 1915.) 



„Late Blight", due to Phytophthora infestans, rarely occurs on 

 the plains of India, though it is present on the hüls. In 1912 — 13 

 a virulent outbreak occurred at Rangpur and Bhagalpur, the 

 cause of which is considered to be the extensive planting of seed 

 tubers obtained from the hüls, at such a time that the plants ma- 

 tured during the excessively humid months of December and Ja- 

 nuary. It was noted that potato fields sown later, in November, 

 remained almost free from disease. 



The usual freedom from disease ofpotatoes grown on the plains 

 is explained by the fact that the fungus is unable to survive the 

 Summer temperatures of that region. Seed from infected localities 

 should therefore be obtained in time to allow the seeds to pass 

 some part of the summer on the plains. 



The haustoria of the fungus and the action of the mycelium on 

 the tissues of the host are described in detail. 



In pure cultures, the author obtained swollen, thick-walled 

 bodies, which he considers to be resting conidia, rather than par- 

 thenogenetic oospores. E. M. Wakefield (Kew). 



Fran^a, C, La Flagellose des Euphorbes. (Archiv Protisten- 

 kunde. XXXIV. p. 108-132. 1 pl. et 4 fig. dans le texte. 1914.) 



La flagellose est donc principalement une maladie de la zone 

 tropicale mais on peut la trouver aussi, bien que rarement, dans la 

 Zone temperee ä Session chaude. David decouvrit dans le latex 

 d'' Euphorbia pilulifera un Flagelle tres mobile [Leptomonas davidi 

 Lafont). Les particularites morphologiques et structurales de Lep- 

 tomonas davidi montrent qu'il s'agit d'une espece bien differente de 

 Herpetomonas juculum Leg. et des autres Leptomonas ou Herpeto- 

 nionas. La culture des Leptomonas des Euphorbes est tres difficüe 

 et nous croyons que l'impossibüite d'avoir du latex non melange ä 

 d'autres liquides, est la cause de l'insucces. L. davidi produit des 

 alterations tres accentuees dans le latex, celui-ci devient aqueux et 

 pauvre en grains d'amidon. Des conditions d'imraunite pourront 

 exister tant que le latex ne reprend pas sa composition primitive, 

 mais l'immunite qui en resulte ne represente pas une defense de 

 l'organisme. Matouschek (Wien). 



Hartley, C. and R. G. Pierce. The control of damping-off 

 of coniferous seedlings. (Bull. N^ 453. U, S. Dep. Agr. Jan. 

 20, 1917.) 



Referring to Pythium Deharyanum, Fusarium nioniliforme, and 

 Corticium vagum Solani, Trelease. 



Ritzema Bos, J., Het Andijvierot veroorzaakt door Mars- 



