350 SUMMARY OF CURRENT RESEARCHES RELATING TO 



cause. He has also watched * the development of the sclerotia of 

 Monilia fructigena on apples till they have attained a considerable size. 

 He compares them with those described by Woronin. 



In another communication | he gives his views on the occurrence of 

 Peronospora viticola, which usually makes its appearance in July, while 

 most other fungi of that genus develop in March, April, and May. He 

 considers that the decaying leaves in the tissues of which the fungus 

 is imbedded are dug into the ground and rot there. Then at the 

 second period of cultivation, in June-July, the ground is turned over, 

 and the diseased leaves are again exposed, and infection follows — due 

 to wind or other agencies conveying 'the spores. These facts should 

 form a guide as to the best time for spraying the vines. 



Heinrich Uzel X recounts the diseases of plants in Bohemia during 

 1904 Chief among these he reckons Puccinia glumarum, which in some 

 districts destroyed half the crops. Pear trees suffered from Venturia 

 pirinum. Apples were cankered by Nedria ditissima. These and other 

 fungi did great damage to cultivated plants. The author also gives 

 cases of insect attack. 



K. Posch § writes on the mischief caused to Cncurbitaceae by the 

 fungus Pseudo-jjeronosjjora cubensis. It has been specially hurtful to 

 Melons. 



Diseases of Beet.|| — L. Hiltner and L. Peters have conducted various 

 experiments having for aim the prevention of disease in the sugar- 

 beet. Infection experiments with Plioma Betm and Bacillus mycoides 

 were without result, and they concluded that these organisms only 

 attacked roots that were weakened by the presence of oxalates. These 

 were produced in the plant by stormy weather and other adverse con- 

 ditions. The authors recommend the use of lime to combat the disease, 

 as it has been found more effective than sulphuric acid. 



F. KriigerlF has examined another disease of beets, a formation of 

 cork causing scabs on the roots. It is due, he finds, to the presence of 

 both animal and fungal organisms. Several species of Oospora were 

 found infesting the beets, but they were wound parasites, and entered 

 the tissues after they had been attacked by Nematodes, etc. The author 

 recommends drainage and lime as preventive measures. 



French Mycology. — M. Boudier** describes four new species of the 

 larger fungi, found in peat-moss. He thinks that such soil is rich in 

 fungi and has not been properly worked. 



P. Vuillemin ft describes a new species of Pyrenomycete, Seuratia 

 pinicola. He thinks the genus distinctive enough to be placed in a new 



* Ber. K. Lehr, fur Weill. Obst. Garten, zu Geisen. a Rh. fur das Etatsjahr 1903, 

 pp. 188-90. t Tom. cit., pp. 187-8. 



J Wiener Landw. Zeit., 1904, p. 917. See also Centralbl. Bakt., xiv. (1905), 

 pp. L52-3. 



§ Zeitschr. " Kert," 1904, No. 244 (2 figs.). (Magyar.) See also Bot. Centralbl., 

 xcviii. (1905) p. 255. 



II Arb. Biol. Abt. Land, und Forstw. K. Gesundh., iv. (1904) p. 207 (253). Sec 

 also Ann. Mycol., iii. (1905) pp. 108-9. 



1[ Tom. cit., pp. 253-318. See also Ann. Mycol., iii. (1905) pp. 109-10. 

 ** Bull. Soc. Mycol. France, xxi. (1905) pp. 09-73 (1 pi.). 

 +t Tom. cit., pp. 74-80 (1 pi.). 



