-183- 



reddish tint. This discoloration is due to precisely the same 

 causes as operate in producing a similar appearance in the Leaf- 

 blight described in the preceding pages. The myceliiLm grows 

 among the cells in the interior of the strawberry leaf, disorganizes 

 and discolors their contents and absorbs their juices. Partl}^ sunk 

 in the diseased tissue of the leaves, and arising from the juycelimn 

 in the interior of these specimens, appeared small blackish fruit- 

 ing organs, the perithecia, about |-to of a millimeter (tto ~ 2x0" 

 of an inch) in diameter. The spores arising from the bottom of 

 the perithecia were fusiform or cylindrical, (Fig. 10), two-celled, 



slightly constricted at the middle, either 

 straight or usually with one or both cells 

 curved, .014-.027 mm. long by .004- 

 .0056 mm. wide. The spores are larger 

 than those in the Saccardoan species, but 

 without expressing here a final opinion, 

 there are reasons for thinking that the 



Fig. 10 — Snores of Ascochyia ^ c a i j ^ i , i 



FragaHce.—sacc. toruis oi Ascocliyta ou the strawberr)^ 



leaves, described by Saccardo, by Peck''' and in this note, belong 

 to one species, A. Fragarice, Sacc. 



A considerable number of artificial cultures of the spores were 

 made, but they did not germinate readil3^ and at that time no 

 conidia were formed on the mycelium. We have not found it 

 about Ithaca, and would solicit more material another season from 

 correspondents, if it reappears on the strawberry. Hitherto As- 

 cocliyta has never been reported as destructive of this host, so far 

 as we are aware. 



As this is endophyllous, {i. e. lives within the leaf), it is neces- 

 sary to .spray the leaves before the time of the plant's blooming, 

 with a fungicide, in order to prevent any possible entrance of a 

 germinating spore into the tissues. The spores are killed by the 

 Bordeaux mixture ; but this mixture may be too strong for the 

 young leaves, and the weaker Bordeaux mixture, (see next page), 

 is advised. As this fungus is so similar to the Leaf-blight in 

 its habits, we urge those troubled with the disease occasioned by 

 the Ascochyta to experiment also with the remedies suggested 

 for the L,eaf-blight and to report the results. 



'''Ascochyta cotorata, Pk., 38th Report N. Y. S. Museum of N. H., p. 94. 

 PI. II, f. 9 and 10. 



W. R. DUDLEY. 



