DISEASES OF PLANTS. CA5 



lowiiij; ]il.iiit diseases wliicli have rccoiitly aiipcarcd in Sweden are given, with 

 direefions for eradical iii^r nr ((iniitatin;.' tlieiii : American gooseberry mildew 

 (Sitlifrrothccd iiiors-iiru). Amei-ican gi-ape mildew {O'idiiiiii tu<-l,('ri) . cabbau;!' 

 club root ( J'ldsiiiotliophord hnissicti ) . eelwornis on oats ('ri/lcncliiis <h'r<ist(t- 

 tri.r). leaf mildew on briai" roses { I'lronosinird spdisd). and ras])berry blight. 

 The report also contains a discussion of the vegetative life of grain rust fungi 

 in the growing i)lant. and of international cooperation for i)rotection against 

 and tlu> combating of plant diseases. A sunnnary of e.xperiments completed 

 during the year, or in progress, at the Koyal Agricultural Academy of Sweden, 

 and a list of imblications for the ye.-ir comiilete the report. — v. w. woi.i.. 



Report of the government botanist, C. A. Barber (Rpt. Dept. Agr. Madras, 

 1005-G, />/>. .)J-.'/.S).— In addition to the routine report relating to collections, 

 e'-onomic plants, etc.. the autlior iiriefly describes some fungus diseases of sugar 

 cane. i)e]ipers. ]ieannts. and Palmyra p.alnis. 



A study of some species of Fusarium and tlie plant diseases they cause, 

 O. Appel and G. Schikorra {Arh. K. Biol. Anst. Land u. For-stir., 5 (1906), 

 Xn. .'/, pp. J.').',-l.'^S, pi. 1, fi(/s. S). — The results of a study of Fusarium diseases 

 <)f a number of leguminous plants are given. 



The St. .Tobn disease of i)eas, which lias previously been noted (E. S. K., 15, 

 \)'. .■'.7.")). is described at some length, particul.ar attention being given to the 

 mori)hology, physiology, and chemical relati"ons of the organism, which is recog- 

 nizi'd as Fitmr'nim va-sin feet urn /j/.s/. 



Other wilt diseases of leguminous i)lants are more briefly described, among 

 them a wilt of lupines and a P'usarium disease of vetch. The lupine disease is 

 said to be caused by a form of /•'. roscion, and a technical description of the 

 organism is given. 



A sunnnary of preventive treatments is given which includes care in selecting 

 seed, avoiding the use of poorly germinating seed, the complete destruction 

 of infected plants when observed, cultivation of resistant v.-irieties. and the 

 rotation of crops. 



Monograph of the genus Ravenelia, P. Dietei. [Bot. CenthL, Bcihcftc, 20 

 {I'JiiU). .i. Abt., .\». 3. pp. S.'i.]-',!.]. pis. 2). — This is a mcmograph of the genus 

 liavenelia. a group of fungi i)arasitic on various species of euphorbiaceous and 

 leguminous plants. The author notes the morphology of the fungi, their life 

 history, geographic distribution, etc., after which he describes the 81 recognized 

 species. A list is given of a number of isolated uredo forms which the author 

 thinks probably w ill be ultimately found as.-<ociated with s])ecies of Ravenelia. 



A new fungus of cereals, .1. R. .Iunonek {Ztschr. P/tdnzciiIcraiilc., IG {1906), 

 \(>. .i. pp. l.il-Ui'>. pi. 1). — The author reports observing luunerouK sclerotia 

 of a fungus on the leaves of winter rye and wheat. Subsecpient studies revealed 

 the fruiting bodies of the fungus, which jiroved to be hitherto undescribed. The 

 fungus seems to be iissociated with attacks of Hi/lciin/id codrcdtdid, one of the 

 wheat tlies. A technical descri])tion of the fungus (Psiloci/he hrtminfisil n. sji.) 

 is },'iven. 



Wheat mildew, C. T. Musson {Agr. Gaz:. X. S. Wales, 11 {1906). Xo. 12, pp. 

 1222-122Jf, fig. 1). — The author reports having observed considerable injury to 

 wheat in Australia, which is due to the mildew Eryslplic gramiiiis. This fungus 

 is well known on a number of species of grass, but this seems to be the first 

 reiK)rt of its occurrence on wheat in Australia. The variety Federation seems 

 to have been badly attacked, as upon the diseased plants no grain was formed 

 and the straw was rendered .-ilmost useless. 



Some experiments on the germinative ability of old ergot sclerotia. Zi.m- 

 mermann (Zt.schr. rflaiizciikrdiik., 16 {1906), Xo. .i. pp. /..^'*-/.</ ».— Studi«'s were 



