680 MMAl;V OF CURRENT RESEARCHES RELATING TO 



spots on tlif leaves, which soon fall off. Various remedies are suggested 

 to combat these fungi. 



The attention of potato -growers * is directed to the importance of 

 spraying their fields with Bordeaux mixture as a preventive against 

 potato disease. In wet seasons, when the disease is prevalent, spraying 

 is of great value, and, even in dry seasons, the treatment is beneficial to 

 the crop. It is recommended that the plants be sprayed as soon as there 

 is a good development of haulm in June or July, and again three weeks 

 later. Full directions are given in Leaflet No. 23 (Potato Disease), 

 published by the Board of Agriculture and Fisheries. 



G. Landau f comments on the rapid spread of epidemic diseases of 

 plants, such as potato disease, mildew, etc. He is of opinion that there 

 must be various meteorological factors concerned of which we know 

 almost nothing. 



G. Fron f found the fungus Lophodermium brachysporum causing a 

 malady of seedling pines by destroying the leaves on which it grew. The 

 fungus has not previously been recorded in France. Good results were 

 obtained in treating a similar fungus with Bordeaux mixture. 



Ed. Griffon and A. Maublanc § publish a series of notes on plant 

 diseases that had come under their observation. Leaves of Helleboris 

 niger, the Christmas rose, showed large brown spots caused by a fungus 

 that had already been identified as Ooniothyrium Hellebori. The writers 

 describe the appearance of the mycelium in the tissues of the leaf, and of 

 the pycnidia which are scattered over the spots. They made successful 

 artificial cultures, reproducing the entire development of the Ooniothyrium. 



The same authors || report the occurrence of the disease of the egg- 

 plant caused by Ascochyta hortorum, already reported from the United 

 States. It attacks the stalks, forming on them large brown spots covered 

 with minute pycnidia. It also attacks the leaves and the fruits. 



Further diseases were noted by them If on cereals (Helmintho- 

 sporium) ; on Beetroot (Phoma tabifica) ; on Potatoes (ScUrotinia 

 Libert iaiui). Tomato plants, along with the potato, suffered in a 

 specially wet season from the ravages of Pkytophthora infestans. Notes 

 are given on the treatment of vine mildew by Bordeaux mixture, and of 

 the loss sustained where the vines have been neglected. There is a 

 record of the progress of oak mildew, which threatens to destroy the 

 young oaks. Gooseberry mildew r has not been noted in France, but the 

 writers do not see how it can eventually lie kept out, as it has spread 

 almost over the whole continent. They warn agriculturalists against 

 warted-scab of potatoes caused by Ghrysophlyctis mdobiotica. They de- 

 scribe the appearance of the disease and the methods adopted for stamp- 

 ing it out. 



Doroguine ** reports a disease of Pine-needles caused by Gytosporina 

 septospora sp. n. The fungus causes yellow spots on the needles, cover- 



* Journ. Board Agric, xviii. (1911) pp. 229-30. 



t Nat. Wochenschr., n.f., ix. (1910) pp. 625-9. See also Bot. CentralM., cxvii. 

 ( 191 1 ) p. 46. 1 Bull. Soc. Mycol. France, xxvii. (1911) pp. 44-6 (3 figs.). 



§ Bull. Soc. Mycol. Prance, xxvii. (1911) pp. 47-50 (2 figs.). 

 I Bull. Soc. Mycol. France, xxvii. (1911) pp. 50-3 (1 fig.). 

 f B Mycol. France, xxvii. (1911) pp. 53-67. 



** Bull. Soc Mycol. France, xxvii. (1911) pp. 105-6 (3 figs.). 



