462 ^SUMMARY OF CURRENT RESEARCHES RELATING TO 



account of the damage done to trees by, parasitic Loranthacea. They 

 are very injurious to the timber, causing it to become brown and brittle 

 and unfit for lumbering purposes. 



The same writer* gives an account of " some unusual fungus diseases 

 in Iowa during the summer of IDOo." These are mainly diseases of 

 fruit trees, due to Cylindrosporium Padi on the cherry, Glocosporium 

 Ribis on the gooseberry, Cladosporinm carpoj)hilum on plums, etc. 

 Interesting notes are given on the appearance of certain diseases in 

 some localities and not in others, for which cHmatic conditions do not 

 wholly account, though a comparison of weather reports over a number 

 of years proves the influence tliat rain and dew have on the spread of 

 fungi. 



E. Salmon f tells the story of the outbreak of gooseberry mildew in 

 this country, and his attempts to get gardeners to stamp it out, and also 

 to get Government prohibition against the importation of diseased 

 plants. He deduces from the facts brought forward by him the 

 necessity tliere is for an international bureau of plant pathology. 



Paul Lorauer f in a note emphasises this need of concerted action, 

 and of some centi'e to which all outbreaks of disease should be notified, 

 and all observations as regards climate and soil, the condition of the 

 host-plants, etc. 



L. Hiltner § reports on plant pathology in Bavaria for the year 1905, 

 and he notes the prevalence of Peronospora viticola, and the increasing 

 maladies of frait-trees caused by Monilia. ScJerotinia Trifoliorimi on 

 clover was wide-spread, and was especially severe on foreign varieties of 

 plants. Methods of combating disease are also discussed. 



F. W. Dafert and Karl Kornauth 1| give a similar account of plant 

 diseases in Austria. Tbey notify a further spread of Plasmopara 

 cubensis on cucumbers. Cherries suffered from Coryneum Beijerinckii, 

 apples from Fusidadimn and Monilia, and pears from Gymnosporangium. 

 New parasites from Austria were Coniothyrium FuckeJii on roses, Valsa 

 salicina on willows, Hercospora Tilioi and Coryneum pidvinatum on lime- 

 trees. These latter tree-fungi have been previously regarded as 

 saprophytes. 



In Norway during 1904 there was no great epidemic either of insects 

 or fungi, but W. M. Schozen^f notes as new for the country Macrosporium 

 melophthorum, which attacked cucumbers and melons in the hot-houses. 

 Fungi were also recorded as doing damage to fruit-trees, currants, and 

 gooseberries. Roses were attacked by SphcRrotheca pcmnosa and Perono- 

 spora sparsa, the latter new to Norway. 



L. Lewton-Brain ** has published a lecture on Rind disease of the 

 sugar-cane, which was delivered to the Hawaiian Sugar Planters' Associa- 



* Contr. Bot. Dep. Iowa State Coll. Agric, No. 23 (1904) pp. 147-54. 



t Zeitschr. Pflanzenkr., xvii. (1907) pp. 12-20. J Tom. cit., pp. 20-1. 



§ Ber. Tatigk. k.B. Agrik. Anst. Miinchen, Possenbachen, 1906. See also 

 Zeitschr. Pflanzenkr., xvii. (1907) pp. 33-6. 



II Ber. Tatigk. k.k. Landw. Chem. Versuchst. Bakt. Pflanz. Schutzst, 1905 

 (Wien, 1906).' See also Zeitschr. Pflanzenkr., xvii. (1907) pp. 36-8. 



^ Beretn. Skadeins. Plantesvgd., 1904, Land-og Havebrug (Kristiania, 1905) 

 26 pp., 17 figs. See also Zeitschr. Pflanzenkr., xvii. (1907) pp. 38-40. 



** Eep. Exper. Stat., Hawaiian Plant.. Assoc. Honolulu, H.I., 1907, vi. and 38 

 pp., 16 figs. 



