352 EXPERIMENT STATION RECORD. 



istics of the causal organism, Botrytis cinerea, and gives the methods usually 

 employed in combating the disease. 



The rot attacks the peduncles and buds just at flowering time, producing 

 brown areas on the peduncles and causing the petals to wither and turn a 

 brownish color. Spraying with limewater, sulphate of lime, bisulphite of mag- 

 nesia, sulphate of nickel, sulphate of copper, formalin, and silicates of magnesia 

 are suggested as preventives. 



Mildew injuries in the forest district of Lekenik, Eigner (Natunc. Ztschr. , 

 Forst II. Land a-., 8 {1910), No. 10, pp. .'i<)S-500) .—In a discussion of the death 

 of large numbers of oak trees in Croatia, the author claims that it was not due 

 alone to the mildew, as many hold, but also to the defoliation of the trees for 

 two years by caterpillars, this being followed in 1909 by the destruction by the 

 fungus of the new leaves subsequently formed, thereby weakening the trees 

 until they died. 



The mildew of the oak, P. Vuillemin (Rev. Gen. Set., 21 {1910), No. 19, 

 pp. 812-816). — The author discusses the taxonomic position, probable source of 

 introduction into Europe, and subsequent dissemination of the oak mildew, 

 which has become epidemic in many Euroijean countries during recent years. 

 It is claimed that the fungus belongs neither to the genus Phyllactinia nor to 

 Microsphsera, but judging from its conidia, is a Sphserotheca, and will probably 

 prove to be 8. lancstris. 



A parasite of the oak Oidium, P. Vuillemin {Coinpt. Rend. Acad. Sci. 

 [Paris], 151 {1910), No. 15, pp. 647, 648; Bui. Trimest. Soc. My col. France, 26 

 (1910). No. 4, pp. 390-393). — Attention is called to the appearance in the for- 

 ests of France of Cicmnobolus cesatii evonymi, a fungus parasitic on the 

 Oidium, which has become so prevalent throughout European countries in re- 

 cent years on various species of oaks. 



It is claimed that by the introduction of this beneficial parasite into regions 

 where the Oidium is so injurious, thp disease may be held in check. 



A maple tree fung'us, A. Hollick {Proc. Staten Isl. Assoc. Arts and Sci., 2 

 (1909), No. 4, pp. 190-192) .—Attention is called to the death of silver maples 

 (Acer saccharinum) and other vegetation along the north shore of Staten 

 Island from New Brighton to West New Brighton, N. Y., caused primarily by 

 the smoke and gases from factories on the New Jersey shore which year after 

 year have either partially or completely defoliated the trees, occasionally two 

 to three times in a season, until the twigs and branches have died and. 

 broken off. 



The wounds thus formed became the center of infection for fungus invasion 

 which finally completed their destruction. The fungus found on the maples 

 was Pyropolyporus igniarius, a well-known wound parasite of trees. 



Some diseases of rubber trees (Agr. News [Barbados], 9 (1910), Nos. 219, 

 pp. 802, 303; 220. p. 318; 221, pp. 334, 335).— In a summary of the diseases to 

 which rubber trees are subject in different parts of the world, attention is 

 called to their close similarity in external symptoms and causative fungi to 

 many diseases of cacao. 



The field symptoms, causal organisms, present distribution, and methods of 

 control for the following are given : Root diseases, caused by Fames semitostiis, 

 Irpex flavus, Hymenoch(Bte noxia, and Poria vincta, and a foot rot of Ca^tilloa 

 trees in Ceylon due to Fusarium sp. ; stem diseases, Ceylon canker (Nectria 

 ■ddversispora) , Ceylon bark disease (Cortidnm javanicum) , Malay bark disease 

 (C. calceum), die back {Gloeosporium aWornhrum and Botryodiplodia elasticce), 

 black canker {Fusicladlum sp.), bark disease (Diplodia rapax), stem disease 

 (Eutypa cavUvora), and horsehair blight (Marasmius sp.) on Hevea. and 

 Funtumia canker (Nectria funtumice) and Corticium javanicum on Castilloa in 



