56 EXPEKIMENT STATIOiSr KECORD. 



Stated that a species of Phyllosticta has been is0lated from infections on grape- 

 fruit leaves. 



Die-back of citrus trees in the northern districts, G. Williams {Queensland 

 Agr. Jour., n. ser., 3 {1915), Xo. 1, pp. 22, 2.3 ) .—Attention is called to the 

 prevalence of die-back of citrus trees in the northern districts of Queensland and 

 to the fact that spraying has failed to control the trouble. 



The author suggests that among the causes of the disease are unsuitable soil 

 conditions and that trees may be kept in a healthy condition by sufficient depth 

 and drainage of the soil, with an even supply of moisture, obtained principally 

 by systematic cultivation. 



Diseases of the peony, H. H. Whetzel {Amer. Florist, Jf4 {1915), No. 14OI, 

 pp. 609-612. figs. 7). — In this paper the author presents a summary account of 

 diseases of the peony, describing their symptoms, causes, and methods of 

 control. 



Although this plant is frequently reported as free from disease, the author 

 describes root gall, due to Heterodera radicicola, and root rots, the cause of 

 which is not known ; mosaic disease ; anthracuose, which is considered due to a 

 fungus as yet unidentified; leaf blotch, caused by Cladosporlum pceoniw; Sclero- 

 tinia stem rot, due to S. Uhertiana ; and Botrytis blight, which has been referred 

 to a number of species, but which the author's studies indicate is due to at least 

 two distinct species of Botrytis causing identical symptoms. 



Diseases of oak and chestnut in Brittany, V. Ducomet {Min. Agr. [Francel, 

 Ann. Serv. Epiphytics, 1 {1912), pp. 87-105). — This is a somewhat detailed 

 account of studies with Oidium and other fungi on oak, also of Mclanconis 

 modonia and other fungi on chestnut. 



Chestnut disease in France, L. Mangin {Min. Agr. [France], Ann. Serv. 

 Epiphyties, 1 {1912), pp. 80-86). — A recent increase of injury by Mclanconis 

 modonia in parts of France is noted. Diaporthc parasitica, where it exists In 

 Europe, is said to be neither so abundant nor so formidable as in America. 

 Iron sulphate and copper sulphate have been proposed as means of protection 

 against M. modonia. 



Air and wind dissemination of ascospores of the chestnut blight fungus, 

 F. D. Heald, M. W. Gardner, and R. A. Studh.vlteb {U. S. Dcpt. Agr., .Jour. 

 Agr. Research, 3 {1915), No. 6, pp. 493-526, pis. 3, figs. 3).— A detailed account 

 is given of investigations on the dissemination of the ascospores of the chestnut 

 blight fungus (Endothia parasitica) by air and wind. All the experiments car- 

 ried out point to air and wind transportation of the ascospores of the chestnut 

 blight fungus as one of the very important methods of dissemination. 



After every warm rain ascospores are scattered from diseased trees in large 

 numbers, having been collected from 300 to 400 ft. from the source of supply. 

 The authors believe that they have been carried much greater distances. 

 During dry periods wind dissemination of ascospores does not occur at all, or 

 only to a very slight extent. 



Witches' brooms on British willows, M. Christy (Jour. Bot. [London], 53 

 {1915), No. 62S, pp. 97-103, pi. i).— The author gives a description of witches' 

 brooms on willow trees which have appeared within recent years. The trouble 

 seems to be spreading, although confined to a rather limited area about London. 

 The abnormal growth is attributed to the gall mite, Eriophyes triradiatus, and 

 the witches' brooms seem to be produced originally from female flowers which 

 have become excessively hypertrophied. 



Estimating nematodes, Baunacke {Jahrcsher. Kaiser Wilhehns Inst. Landio. 

 Bromherg. 1913, pp. 28-30).— A modification is described of methods formerly 

 employed, according to which these organisms are separated from soil taken at 

 desired depths, stained, and fixed for counting at convenience. 



