226 SUMMARY OF CURRENT RESEARCHES RELATING TO 



been traced by G. G. Hahn, C. Hartley and E. G. Pierce ■"■ as due to the 

 attack of a Phoma sp. It is primarily a disease of seedlings ; trees of 

 over four years old sfenerally escape. Inoculation and control experi- 

 ments were carried out with success. The fungus occurs on lesions in 

 the stems. 



An " end-rot " disease of the cranberry is described by C. L. Shear.f 

 It attacks the cranberry at the blossom end and causes a softening of 

 the tissues. The diseased part is lighter coloured than the sound 

 portion of the berry, and the discoloration spreads as the rot develops. 

 The cause of the rot is a Sphsropsidaceous fungus, Fusicoccwn putrefaciens 

 sp. n., and it is surmised that it is a stage of a Genangium sp. The 

 disease has been found to occur in all the cranberry-growing sections of 

 the United States, and has caused considerable damage. 



A. D. Cotton I is the author of Leaflet No. 56 recently issued by the 

 Board of Agriculture, which deals with apple canker due to a 

 minute fungus, Nectria ditissima. The influence of the soil is discussed. 



J. R. Jolewalaie and S. C. Bruner§ have described PMjllachora 

 Roy'stoneae sp. n. as a disease, though unimportant, of the royal palm, 

 Roystonea regia. 



G. H. Godfrey 1| records the occurrence of ScUrotium Rolfsii as a 

 disease of wheat. ' The lesions occurred on the crown and lower portions 

 of the culms. The heads on the diseased culms, though normal in 

 general appearance, were entirely devoid of grain. 



L. Garbowski IT has noted the presence of Sclerospora macrospora on 

 corn in Podolia (Russia). Oospores were found in the tissues of the 

 leaves. In a further communication the same author gives a long list 

 of parasitic fungi collected by himself in the same region during the 

 summer of 1915. He determined four new species of microfungi and 

 new hosts for others. The list extends to 121 species. 



R. C. Faulwetter *" describes a leaf-spot of cotton due to an AUernaria 

 not unlike A. tenuis. It is a weak parasite, and only infects healthy 

 tissues in favourable conditions ; it is most prevalent on leaves already 

 affected by red spider or by Bacterium malvacearum. 



M. B. McKay and Venus W. Pool ft tiave made a field study of ' 

 Cercospora heticola. They record the different plants on which it occurs, 

 its effect on the host-plant, and the methods of dealing with the disease. 

 Placing the diseased leaves in silo was found to be effective, as the 

 fungus did not survive the silage process for even two weeks. 



E. Schaffhit and G. Voss JJ have repeated their field experiuients with 

 black-wart of potatoes {Synchytrium endoUoticim). After eight years 

 the spores survived in infected ground and caused a severe attack of the 

 disease. 



* Journ. Agric. Research., x. (1917) pp. 533-9 (2 pis.). 



t Journ. Agric. Research, xi. (1917) pp. 35-41 (1 col. pi.), 



X Journ. Board Agric, xxiv. (1918) pp. 1263-5 (1 pi.). 



§ Mycologia, x. (1918) pp. 43-4 (1 pi.). 



II Phytopathology, viii. (1918) pp. 64-6 (3 figs.). 



i Bull. Soc. Mycol. France, xxxiii. (1918) pp. 33 and 73-91 (4 figs.). 

 ** Phytopathology, viii. (1918) pp. 98-105 (3 figs.), 

 tt Phytopathology, viii. (1918) pp. 119-36 (2 figs.).- 

 XX Zeitschr. Pflanzenkr., xxvii. (1918) pp. 339-46. 



