470 SUMMARY OF CURRENT RESEARCHES RELATING TO 



N. N. von Speschnew * (Tiflis) has examined grapes affected with 

 Black Rot, from Trans-Caucasia. He finds not only the fungi Guignardia 

 reniformis and G. Bidwellii on the fruit, but also the perithecia of Dip- 

 lodia uvicola. 



A disease of clover is caused also by a member of the Sphseropsidia3, 

 Glceosporium. It has been examined by 0. Kirchner.f The seat of the 

 malady is on the stalk where there occur elongate brown spots. The 

 spots are studded with the perithecia of the fungus, which has hitherto 

 been considered identical with G. Trifolii Peck. The author finds, 

 however, that this stem fungus varies somewhat from G. Trifolii, which 

 always attacks the leaves, and he considers it to be a new species. He 

 has named it G. caulivorum. The parts of the plant above the point of 

 attack all die off. 



P. Hennings J records two new parasitic leaf-fungi from Brandenburg. 

 Septoria Caraganse sp. n., the perithecia of which are scattered over the 

 under side of the leaf of Caragana arborescens, the Siberian Pea-tree, 

 causing somewhat yellowish spots. The other, which grew on the leaves 

 of Bobinia Pseudo- Acacia, was named by him Fusarium Vogelii. It forms 

 roundish dark-brown spots on the leaves and kills the tissue so that the 

 leaves look as if eaten by caterpillars. 



The same author § contributes a note on the American Gooseberry 

 mildew, Sphaerotheca mors-uvse. He found the fungus on some goose- 

 berry leaves from the neighbourhood of Moscow. He considers it to be 

 indigenous in Russia and almost certainly identical with Spliserotheca 

 tomentosa, which is very common on species of Euphorbia. The latter 

 fungus is morphologically very similar to the gooseberry mildew. This 

 disease appeared in Ireland in 1900. E. Salmon, j| who first noted the 

 fungus on this side of the Atlantic, gives notes of the further progress 

 of the disease. He warns gardeners against allowing the fungus to 

 spread, and recommends spraying the plants attacked. 



A resume is given of six lectures on fungal diseases of plants by 

 G. Massee.^f A discussion of the conditions favouring disease is followed 

 by a detailed account of several specific casep of attack. The history of 

 Botrytis cinerea on snowdrop is given, and the disease of tomatoes caused 

 by Cladosporium fulvum is described. Some injuries to fruit and other 

 trees caused by members of the higher groups of fungi are explained. 

 Advice is given as to methods of watering, spraying, mulching, and 

 planting, and in a summary at the close the lecturer has given an 

 account of the dissemination of fungus spores and the best way for 

 the planter to prevent the further spread of the parasites. The lectures 

 are illustrated by figures in the text. 



Disease of Maize.** — V. Peglion has described the injury induced 

 in grasses by the attack of the false mildew of maize Sclerospora grami- 

 nicola. In the plants attacked a proliferation of the vegetative axis 

 takes place, with a thickening of the stalk and the leaves lose colour. 



* Zeitschr. f. Pflanzenkr., xii. (1902) p. 10. f Tom. cit., pp. 10-4. 



I Tom. cit., pp. 14-6. § Tom. cit., pp. 16-7. 



|| Journ. Roy. Hort. Soc, xxvi. (1902) pp. 778-9. 

 % Tom. cit.. pp. 724-44. 



** Le Stazioni sperimentali agrarie italiane, xxxiv. (1901) pp. 506-32 (3 pla.). 

 See also Centralbl. Bakt., viii. (1902) pp. 652-3. 



