712 SUMMARY OF CURRENT RESEARCHES RELATING TO 



A disease of haricot beans was found by A. Puttemans* to be due tO' 

 Isariopsis griseola ; it attacks both leaves and pods, and works great 

 harm to the host-plants. The fungus /. griseola is synonymous with 

 Cercosfora columnar is and Arthrobotryum Pvttemansii. Methods of 

 combating the disease are given. 



Garden roses had their stems attacked by spots on which spore- 

 containing pustules were developed. R. Laubertt diagnosed the fungus 

 (one of the Sphteropsidege) to be a new species of C'r//ptosporiwn, G. 

 minimum. The branches had been weakened by the frost of the 

 previous winter, and thus rendered less resistant to fungoid attacks. 

 The branches were killed by the fungus. 



H. Diedicke| has examined the nature of the leaf-spots of ivy. He 

 found growing on them three fungi, Fliyllosticta hedericola. Ph. hede- 

 racea, and Vermicidaria tricheJla. There were some other fungi present, 

 but of less importance. A series of infection experiments was carried 

 out, and it was proved that Ph. liedericola and V. tricheUa were not able 

 to infect old and undamaged ivy leaves, but their spores could penetrate 

 through wounds, and give rise to the leaf -spots. A further set of 

 experiments on young leaves confirmed this view. Ph. hederacea is not 

 a parasite : it lives parasitically on the tissue killed by the other two 

 forms. 



Cones of the birch were noticed by F. W. NegerS to be constantly 

 brown at the tips. When they were kept in a damp chamber, these 

 brown portions produced a Botrijtis form. Many cultivations were 

 made, and the results obtained showed that two kinds of sclerotia were 

 found in the cones : Sclerotinia Bet idee, which grows on the fruit, and of 

 which the conidial stage is Monilia, and the sclerotium of a Botrijtis^ 

 presumably B. cinerea, which grows on the scales ; no apothecia were 

 formed, 



T. Fetch II finds that root disease of Hevea hrasUiensis is due to a 

 fungus. Fames semitostus. He found the mycelium on the affected roots. 



Further instalments of the Handbook of Plant Diseases have been 

 issued by Sorauer and Lindau.lf Part K treats of diseases due to 

 Ascomycetous fungi, more especially Monilia and Sclerotinia. The 

 T^stilagineas and Uredinea are also dealt with. 



E. L. Bouvier** has described again the ravages caused to the fir 

 Ah'ps pectinata, in the Jura mountains, by some parasitic disease, pro- 

 bably the fungus Rhizospluera Ahietis ; but no exact diagnosis of the 

 cause of the malady was possible. The writer recommends the removal 

 of the trees attacked. 



E. S. Salmonft has found an Oidium on Prunus Laurocerasus identical 



* Rev. Agric. S. Paulo, 1906, pp. 200-4 (3 figs.). See also Ann. Mycol., v. 

 (1907) p. 297. 



t Centmlbl. Bakt., xix. (1907) pp. 163-8. X Tom. cit., pp. 168-75 (1 pL). 



§ Ber. Deutsch. Bot. GeselL, xxv. (1907) pp. 368-72 (1 fig.). 



II Circulars and Agric. Jouru. Roy. Bot. Gard. Ceylou, iii. No. 17 (1906) 

 pp. 237-42. See also Bot. Centralbl. cv. (1907) p. 171. 



^ Handbuch der Pflanzenkrankheiten. Berlin : Paul Parey, lief. 6-10 (1906). 

 See also Bot. Centralbl., cv. (1907) pp. 196-8. 

 ** Comptes Rendus, cxlv. (1907) pp. 537-41. 

 +t Journ. Roy. Hort. Soc, xxxi. (1906) pp. 142-6. 



