G48 EXPERIMENT STATION RECOHD, 



foniid by Tranzscliol (K. S. li., 10, j). .■'>S4) ofciu-riiifx ;is .lOcidinm on AiicnKino 

 and to bo connected witli Ochrosiiord soihi on species of Tyrns. 



The present theory rcKardinf: these rusts is ili.ii nri;.'iiially /'. iinnii-siiinostr 

 was able to produce all its si)ore forms on liolh rruiins and Anemone, but that 

 it has become so specialized that one form is limited for the uredo and telento- 

 spore stapes to Prnnus, retaininji its secidial staj^e on Anemone, while the form 

 on Anemone has lost its a>cidial and nredo form and lives on Anemone only. 



Biological investigations on the germinating' power and germination of 

 the uredospores and aecidiospores of the grain rusts, E. Sciiaiimt (.\iiii. 

 MycoL, 7 (1909), \(>. (i. pp. 509-523, p(j. I). — This is a general discussion of 

 the various conditions (hat may affect the germinating power and germination 

 of the tecidiospores and uredospores of the grain rusts, such as ripeness and 

 age of the spores, heat, wind, moisture, condition and influence of host, etc. 



The leaf spot of clover and alfalfa (Pseudopeziza medicaginis), K. Xih.ks 

 {Dent. Landir. I'rcssc, Sd (1909). No. 80, pp. 85'/, 855, figs. 6). — This very com- 

 mon disease of alfalfa is claimed by the author to be identical with a similar 

 fungus ( /'. trifolii) on clover. He also claims that a form of Phyllosticta found 

 on both alfalfa and clover is only an imperfect stage of the leaf-spot fungus ( /'. 

 medicaginiii). Cross inoculation experiments witli pure cultures of the two 

 Pseudopezizas on clover and alfalfa plants were successful. Cultures of the 

 Phyllosticta on both hosts produced the Pseudopeziza apothecia and spores of 

 the Pseudopeziza sown on the leaves of clover and alfalfa produced the fruit 

 bodies (pycnidia) of the Phyllosticta form. 



Cotton anthracnose investigation, H. W. Barre (South Carolina Sta. Rpt. 

 J909, pp. S9-IIS. /if/s. 7). — This is a progress report on the author's investiga- 

 tions, a preliminary account of which has been noted elsewhere (E. S. P., 22, 

 p. 544). Detailed accounts are given of inoculation experiments to determine 

 the method of infeqiion and also of exi)eriments conducted to test the possi- 

 bility of disinfection through the treatment of the seed. 



The author found as a result of his inoculation studies that the disease may 

 be developed in the bolls at any age or on any variety when inoculated with 

 spores through punctures in the boll wall. On entering the inoculated bolls 

 the fungus attaclis the lint, and later enters the seed coats, penetrating the 

 endosperm and cotyledons. When flowers 10 hours after opening were si)rayed 

 with water carrying spores, 44 per cent of the bolls developed from such 

 flowers were diseased. Where young bolls were inoculated in a similar man- 

 ner, 53 i)er cent became diseased, the amount of disease varying with the age 

 of the bolls at the time of inoculation. In botli the artificial and natural infec- 

 tion the fungus enters through the lines of dehiscence of the bolls. Inoculation 

 with a spray carrying spores had no effect on the bolls after they were three- 

 fourths grown, ami it is believed that natm-al infection must take place before 

 or when the bolls are about half grown. 



Studies of diseased seed in which attempts were made to destroy the fnngtis 

 by treatment failed to give any practical results. 



The investigations seemed to indicate that the fungus is unable to live more 

 than 10 months on the old diseased bolls and seed in the field, and it is believed 

 that a one year's rotation with clean seed would eliminate the disease. 



Scolecotrichum graminis avenae, F. Krause (Centbl. Bakt. [etc.], 2. Abt., 25 

 {1909), No. 1-Jf, pp. 102-106, pi. 1). — Oats in Western Prussia have for several, 

 summers been attacked by a fungus that forms yellowish brown spots on the 

 leaves. An examination of the diseased tissues showed tliat these were due to 

 /S'. graminis arena'. 



A pathological change in the embryo of wheat grains, U. Brizi (Rie. Lab. 

 Chim. Agr. li. Svuola Sup. Agr. Ullano, 3 {1908), pp. 169-172). — In the prov- 



