548 EXPERIMENT STATION RE(^ORD. 



lation of a publication iiroviously noted ( E. 8. R., '_'<», ]>. 1141 », willi various 

 alterations to brinj; the subject matter up to date. 



A disease of Para rubber, II. N. Ridley (Agr. liul. l^lraits and Fed. MnUiy 

 tStdtrs, S (I'JOlt), .\<). I.i, pp. ,5761, J77). — A disease of llevea has been desiTii)e(l 

 in a previous publication (E. S. li.. 2_'. p. 24s) and in the present publication 

 a rei)ort is j;iven of the deterniinal ion by (i. Massee of tlie funjius. Tliis 

 proved to lie an uudescrilxMl spc<ics of lUplodia. to wiiich the name />. ntpa.r 

 has been jriven. Fn)ni its general sti-n»tnre, habit, and parasitic nature it is 

 sngjrested that it is jirobably a staj,'e in the life cycle of some species of 

 Kosellinia. 



The introduction of Septoria azaleae into Silesia, R. Ewert (ZtftrJir. P/lan- 

 zcnhraiilc, I!) (1009), A'o. 6', pp. Sil-St'i). — In 1908 certain varieties of azalea 

 in southern Silesia were found to be affected with a disease which attacked 

 the leaves. The affected plants were imported from Saxony and the disease 

 undoubtedly came from that region. A careful examination of the plants 

 proved that they were infected with S. azalece, as the spots on the leaves 

 showed tlie characteristic tiu-eads mid fruit bodies of this fungus. 



Mildew of the oak in Portugal and Madeira, C. Torrend (Brot^ria,8 (1909), 

 pp. lOS-ll.i). — The autlior describes the mildew of oaks due to O'idium querai- 

 nuni. giving an account of its distribution in Portugal and its occurrence in 

 Maderia. 



The author believes that the mildew will not prove generally destructive, 

 as oaks are not extensively grown in forests except in Portugal and there the 

 cork oak seems more or less resistant to the mildew. It seems to attack many 

 other species of oaks, the species introduced from America not being immune. 



Notes on Oidium quercinum, J. S. Tavares {Bro16na, 8 {1909), p. 16). — A 

 brief account is given of the occurrence of (). quercinum on oaks in Portugal. 



A new disease of Picea, A. W. Borthwick (yotes Roy. Bot. Gard. Edinh., 

 1909, Xo. 20, pp. 259-261, pJ. /). — A brief account is given of a new disease of 

 Picea, which attacks the buds of the trees, sometimes stopping their further 

 growth, but if only one side of the bud is attacked, producing a twisted shoot. 

 The diseased buds are encased in a dense black sheath, thickly dotted with the 

 fruit bodies of the fungus, which is described as a new species, Cucurblturla 

 picece n. sp. 



Frost canker of Picea sitchensis, A. W. Rorthwick CSotcfi Roy. Boi. Gard. 

 Edinh., 1909, A'O. 20, pp. 263-265, pi. /). — The Menzies or Sitka spruce, which 

 is extensively grown in parts of England on account of its value as timber, is 

 dying in large quantities from a form of canker, young trees lieing the worst 

 sufferers. 



The first symptom of the attack is a change in the foliage from dark green to 

 pale yellow. Next the leader loses its leaves, turns dark red in color, and its 

 buds or branches are arrested in growth. The needles are retained on the older 

 parts and if the trees are not killed outright an attempt is made to replace the 

 leader by a side branch. The stem in many cases was found to be cankered. 

 The canker at first is a small flattened area from which exudes a thin, bluish 

 white resin. Later the bark splits, exposing the wood, and the tree attempts to 

 cover this by a callus formation. Fructifications of an ascomycete are invariably 

 present and may be the cause of the disease, but an anatomical examination of 

 the tissues leaves little doubt that frost is the primary cause. A severe frost of 

 10 to 15° occurring in May is supposed to have caused the injury. 



Other conifers have also been attacked in a similar manner. 



Peziza willkommii on larches, A. W. Borthwick (Notes Roy. Bot. Gard. 

 Edinb., 1909, No. 21, pp. 23-26, pi. i).— This is a discussion of efforts to find 

 exotic species of larch that are resistant to the European larch canker 



