experi:mext station bulletins. 



265 



a chill brown. The leaves soon turn yellow, begin falling before the middle 

 of Jnly, and by the first or second week in August, if not earlier, the 

 bushes' are as bare as in November. Mr. Booth says that ''under such 

 circumstances the currants do not fully ripen but shrivel and fall off." 



The spores (Fig. -4) are one celled, curved, somewhat 

 enlarged at one end, and, in all North American forms 

 reported, from 1^ to 2 times the length of the Euro- 

 pean forms described by Saccardo. The measurements 

 given by Berkeley, Peck, and those made by ourselves, 

 practically agree, being fi'om .015 to .025 millimeters 

 in length. Specimens from France in Eoumeeguer's 

 Fungi Gallici No. 1873 are from .012 to .016 millimeters 

 long, and M. C. Cooke sent Ellis* specimens from 

 Europe which were mostly .015 m. m. long, while 

 Saccardo in his great workr gives only .010 of a m. 

 FcG.4.-Spores of Giceos-T^- ^^ ^h^ length. There seems little doubt therefore 

 porium. Kibis. of the identity of the American and the European 



forms, nevertheless the disease seems to have done little injury in Europe, 

 and until this year, not to have attracted any attention whatever in 

 America. 



It is to be hoped that the peculiarly moist summer gave it an advantage 

 it will not soon have in succeeding years, but it may be necessary to care- 

 fully watch the varieties susceptible to it, next June, and to apply occasion- 

 ally by means of a fine sprayer, like the Eureka Si^rayer, one of the copper 

 solutions : for the entrance of the spores into the leaf must be ^;r<'rp/?/ec? 

 if the crop is to be protected. It is fair to suppose the copper solutions 

 will be as efficacious in this as in strawberry leaf blight. 



The biological investigation of this presents peculiar difficulties, for we 

 have little doubt that it hibernates elsewhere than on the fallen leaves of 

 the previous season. 



III. LEAF-BLIGHT OF QUINCE XSD PEAE. 



Entomosporium raaculatum. Lev. 



Fig 5.— I<eaf of Quince with spots of Entomosporium fxincr^is and 

 aculatum: aLso the spores (sp.) of the latter much ^,.' 



Five vears ago Mr. G. F. Wilcox 

 of Fairport, N. T., sent to. the 

 University, quince leaves and 

 fruits very much diseased by the 

 above. The leaves were affected 

 by circular brown spots from I'to 3 

 millimeters in diameter, and the 

 fruits had many brown patches 

 from 3 to 7 millimeters in diameter 

 on the surface. At the center of 

 the diseased areas in both cases 

 were small perithecia (or pseudo- 

 perithecia ) containing the insect- 

 like spores (fig. 5, sp.) of this 



from 



^ ,. ij_i--n.o ai^^L cij-icixj.- ...i^.x^ the 



7/ia<n/7afuni; aLso "the spores (sp.) of the latter much ^t' • " „,jf^,,^ 4-1^ ^ ^^11-, 



magnified.-E. Poeteb, Del. mycelium growing among the ceils. 



arising 



*EUis and Everhart, Journal of Mycology I. p. 

 tSvlloge Fungorum III, p. 706. 



34 



110. 



