842 EXPERIMENT STATION RECORD. 



vlously. set fruit in case of fro.st-liilled pistils as well as of uninjured ones, 

 and a considerable proportion of such fruit was still developing on Au;^st 15. 



Cronartiurn rihicolu, whicli is said to attack black currants mainly through 

 the stomatu of the lower leaf surface, was largely checked by an application 

 of 1 per cent Bordeaux mixture to that surface (the case of Fusicladiura on 

 pear giving similar results from the same treatment), but the fruits were 

 unfavorably affected in growth and appearance by this treatment. Red currants 

 were amply protecte<l against Fseudopeziza ribiti by spraying the ui)per leaf 

 surface. Comparative tests w'ith California mixture employed against P. ribis 

 on currants susceptible thereto resulted favorably. 



The inlltience of air-borne chemical products e.scaping from factories and 

 settling on vegetation was again studied. See page 826. 



A table showing the degrees of attack by fruit disease on pears by Fusi- 

 (iadiiim pirinum and Mycosphwrella sentina in relation to the weather for 

 1904-1913 is also given. 



Observations on diseases in nursery and orchard, O. Schindler {Ber. K. 

 Lchramt. Obfit it. GarUnbaa Proskau, 1013, pp. 33-38. fig. 1). — In addition to 

 mention of some insect iujtiries, brief notes are given of plant disea.ses. 



Spraying for American gooseberry mildew March 17 and April 4 with 0.5 

 I)er cent potassium sulphid or 20 per cent lime sulpliur, and on May 3 and June 

 3 with 0.5 per cent potassium sulphid or 2 per cent lime sulphur gave very 

 good results, whicli were in some degree impaired, however, by a blowing 

 rain about June 3. Repetition of this treatment on June 24 showed no results. 

 A strong (20 per cent) solution of lime sulphur considerably decreased injury 

 to peach foliage from Exoasciis dcffinnan.s pcrsicw. 



Recent studies at the Agricultural Botanical Institute at Munich, L. 

 IIiLTNEB (Wiener Landw. Ztg., 6Jf (1914), Nos. 76, pp. T13-115, figs. 3; 77, p. 

 720, figs. 5). — It is stated that Fusarium attack on rye in early spring was pre- 

 vented by soaking the seed in 0.1 per cent corrosive sublimate, and that the same 

 treatment seems to promise good results as regards germinability, vigor, and 

 growth in case of legumes. It has been found that lupines showing poor 

 development on limy soil may be restored to normal vigor by siiraying several 

 times with 0.5 to 0.75 per cent iron sulphate, but that the chloro.sis reappeared 

 after spraying with milk of lime. 



A series of experiments indicated that spraying or brushing on 1 to 2 per cent 

 .solutions of potassitim or magnesium salts in case of .several economic plants 

 gives increased growth and vigor. 



The effects of fertilizers applied through the medium of the soil are briefly 

 noted. Addition of humus (which acting alone was ineffective) to serradella 

 and mustard which made poor growth in sand wuth otherwise liberal nutriment 

 gave striking results, and a like effect followed the addition of certain pulver- 

 ized rocks to mineral nutritive media. 



Second contribution to the mycolog'ical fl.ora of Tunis, R. Maibe (.Bui. Soc. 

 Hist. Nat. Afriqiie Nord, No. 9 (lOlJf). pp. 254-260. figs. 3). — About 40 species 

 are listed, of which 2 are described as new, these being named, resj^ectively. 

 Protomyces helminthiw on nelininthia cchioides, and Lophidium chamccropis on 

 Chamccrops hu milis. 



New species of Colletotrichum and Phoma, P. J. O'Gara (Mycologia, 7 

 (1915), No. 1, pp. 3S-Jfl). — The autlior describes and names as new species 

 C. deslriictivuin parasitic on the leaves, petioles, and stems of clover, C. solani- 

 coluiii in the subterranean stems of potato, and C mlinonicolor and P. rostrata 

 on the leaves and stems of Aselepins speeiosa, all in Salt Lake Valley, Utah. 



The control of root knot, E. A. Bessky and L. P. Byars (U. S. Dept. Agr., 

 Farmers' Bui. 648 (1915), pp. 19. figs. 20). — This is a popular biUletin in which 



