1920] DISEASES OF PLANTS. 243 



sliittMl, has nmdo its nppca ranee in the vicinity (»f rnllnian, Wash., In one ease 

 ("iiisiufj; 40 [MM- ceiil loss in the coin erop. ('ontrasls in characters are drawn 

 nji for the head snmt and the common corn snuit hy which the new form can 

 lie readily r(>co;,'id/.e<l, and suggestions are given for control measures wliich 

 include tlie destruction of diseased plants at the first appearance of smut and 

 till' elimination of other suscejitihle crops in rotation. 



IJeport of the coiiferi'iioe on sweet potato jn'oblenis and on di.scases of 

 cotton, corn, and touiatoes (Washinytun: Advisory lid. Avicr. Plant rath., 

 .\mcr. I'hytopath. Soc. 1919, pp. 16). — At this conference (consisting of 46 

 persons who are listed as representinj; 13 States and the U. S. Department of 

 Agriculture), which was in session at Kirmingham, Ala., February 20-28, I'Jll). 

 sweet potato problems were divided into thos«' pertaining to field, .storage, and 

 marlveting, respectively. Cotton diseases dealt with included wilt (Fu.sariuin 

 vusinfectum), anthracnose {(JlonicreHa yossyyii), angular leaf spot {liacterinm 

 vialraccanint), and Diplodia boll rot (Diplodia yos.sypina). Corn diseases were 

 divided into root disease. Fusarinni spp. largely, and brown spot (Physodcrma 

 zea maydis). Tomato diseases included Fusarium wilt (F. lycopersici) , early 

 blight (Alteniaria solani), mo.saic, blossom end rot, and Septoria leaf blight 

 (S: lycopersici). A resume is given of the discussion on the diseases and sub- 

 jects relating thereto. 



Additions to the li.st of plant disea.ses of economic importance in In- 

 diana, G. A. OsNEi! (Proc. Ind. Acad. Hci.. 1917, pp. ///.7-/-}7).— These additions 

 to the lists furnished, resjiectively, by Pi[)al and the present author (E. S. U., 

 o9, p. 547) rei)resent collections made during the previous season and comprise 

 di.seases alTecting al)OUt 17 economic plants. 



Report on the work of the division of pliytopathology [Mauritius], h\ A. 

 SiocKUALE (Ann. Rpt. Dept. Agr., Mauritius, 1916, pp. 7, 8). — No serious epi- 

 demics of fungus diseases occurred during the year, though the cyclone of May 

 20, cau.sing serious damage to crops, favored attacks by fungi and bacteria 

 doring June. Sugar-cane root disease was reported as causing daniage in one 

 locality. IMthy deterioration of the stem was connnon in all Tanna varieties. 

 V;irying results were olitaini'd from treatment of potato leaf disease {J'liy- 

 Idphtliora infestans) with Bordeaux mixtiu'e. A collar disease of pistache 

 caii.sed by a species of Fusarium w^as conmion in all parts of the island, but 

 was controlled by dusting with a mixture of powdered copper sulphate and lime, 

 the solution of the substances being effected by means of rain. 



Pathological [report, Western Au.stralia], D. A. Hekbkrt (Dcpt. .Ayr. and 

 Indus. ^\ est. Aust. Ann. Rpt. 1919, p. 29). — The author reports the occurrence 

 of various jtlant diseases. Among disorders of potatoes are mentioned Irish 

 bligiit (riii/loplitliora infestans), wet rot or bacteriosis (liacillus .'iola)iaccaruin), 

 brown ring, Kliizoctonia rot, and nematodes. Scab may be produced locally 

 Itither l)y some unfavorable soil constituent or by attacks of Actinuniyces cliro- 

 moycneits. Black rot somewhat resembles brown rot {Fusarium solani), the 

 form having recently been identilie<l for the first time locally, though apparently 

 common. 



Other economic plants are named in connection with diseases or attacking 

 organisms, as apjile, Fusicladium dendriticum ; pear, F. pirinum; onion, downy 

 niildew (Pcronospora schleideni) , and red root (of unknown causation) ; loquat, 

 F. dendriticum; ajiricot, peach, and almond, shot hole (Clasterosporiuni car- 

 pophiluin) ; orange, brown, rot, .scab, melanose, corky tissue, sooty mold, exan- 

 thema, Spha^rella citri, wither tip (Phonia oinnivora) ; lemon, brown rot, wither 

 tip {P. omnivora) ; wheat, take-all (Ophiobolns yramiuis), ear cockle, Septoria, 

 smut, and rust; beet, eel-worm; red gum, a shelf fungus (Polyporus) ; rhubarb, 

 root rot (Armillaria mellea) ; Freesia {Ileterosporiuin yracile) ; alfalfa, root 



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