204 Pflanzenkrankheiten. 



Biakeslee, A. F., Lindner's roll tube method of Separa- 

 tion cultures. (Phytopothology. V. p. 68—69. 1915.) 



A brief notice to make clear that the writers method of 

 making roll tubes, had been in use and previously noted by 

 F. Lindner. Since the method seems to be not generally recog- 

 nized and familiär to a great many mycologists, and inasmuch as 

 Lindner's original account is in a brewery Journal presumably 

 difficult accessible, the writer gives a brief exposure of this met- 

 hod, its technical description and its advantages over that em- 

 ployed with plates or Petri dishes (larger number of colonies that 

 can be isolated -from a Single pouring and relative freedom from 

 contamination during the Operation and later growth). 



M. J. Sirks (Wageningen). 



Boncquet, P, A. and W. J. Härtung. The comparative 

 effect upon Sugar beets of Eutettix tenella Baker from 

 wild plants and from curly top beets (Phytopathology, 

 V, p. 348-349. 1915.) 



The writers demonstrative experiments about the effect of 

 wild specimens of Eutettix tenella Baker to curlj'- top in sugarbeet, 

 and that of specimens found upon diseased plants of beet, show 

 most strikingly that the wild insect used, Coming from Artemisia 

 and Atriplex species had absolutely na power to produce curly 

 leaf, while similar insects reared upon diseased beets were 

 extremely pathogenic. They also show that the wild insects become 

 pathogenic after feeding for a few days upon affected plants. 



M. J. Sirks (Wageningen). 



Bro-wn, N. E., New or Noteworthy Plants. Stapelia Dummovi 

 sp. nov. (Card. Chron. LXI. p. 132. March 31, 1917.) 



The new species here described originated from plants sent to 

 Kew from Uganda. In coronal structure the plant resembles spe- 

 cies of Caralluma. E. M. Cotton. 



Dastup, J. F., Phytophthora on Vinca rosea. (Mem. Dep. Agric. 

 India. Bot. Ser. VIII. 6. p. 233-241. 1916.) 



During very damp weather plants of Vinca rosea were observed 

 to be attacked by a species of Phytophthora. Leaves, youngshoots, 

 flowers and fruits turned brown and finally black. The disease 

 disappeared with the onset of better weather, and it was found that 

 infection could only take place in an atmosphere saturated with 

 moisture. Mature stems could not be inoculated. 



The Phytophthora belongs to the „infesta^is-group'\ having the 

 peculiar method of development of oospores described by Pethy- 

 bridge. The conditions for the production of oospores could not 

 be determined; — they are not formed continuously in culture. 



As a result of comparative studies of morphology and of in- 

 fection experiments, the author concludes that the fungus on Vinca 

 rosea is a biologic variety of Phytophthora parasitica, Dast. 



E. M. Wakefield (Kew). 



Dastup, J. F., Phytophthora sp. on Hevea brasiliensis. (Mem. Dep. 

 Agric. India. Bot. Ser. VIII. 5. p. 217—232. Text figs. 1916.) 

 The author discusses the question of the identity of the Phy- 



