The Cultivated Native Plums and Chebries. 95 



one case Profefesor Craig received specimens on tke Blue Orleans 

 (P. domestica) from Toronto. It is destniotive, as he informs me, 

 on Manitoba yellow plum, Cheney, Eollingstone, De Soto and 

 Sj>eer. The disease did not appear, according to IMr. Craig, in 

 Canada on the Central experimental grounds last year. Here at 

 Ames it has not appeared on Prunus domestica, but in addition 

 to the above, it is found on P. spinosa. It has become a veiy 

 destructive fungus on sour cherry (PninuB Cerasus), damage 

 amoimting from two to twenty-five per cent. The disease is 

 undoubtedly on the increase." 



A fruit-spot (Fig. 12) has been sent me by T. V. Munson, Deni- 

 son, Texas, on the Golden Beauty. The disease is said to be seri- 

 ous in some years. It does not injure the fruit greatly except to 





Figure 12 — Fruit-spot. Natural size . 



disfigure it and to render it unmarketable. I submitted the speci- 

 mens to Professor J. E. Humphrey, of the Massachusetts Agracul- 

 tural College, who found the disease to be a phoma, but the exact 

 species could not be determined. It is, no doubt, somewhat aUied 

 to the black-rot of the grape, and the treatment used for grapes 

 should be tried upon the plum; and a similar treaitment is advised 

 foi* the fruit-scab shown in Fig. 11. 



There are no data for determining the extent of the native plum 

 industry, but it is safe to say that it is much more unportanit than 

 any one, except those imniediaitely concerned, has known. There are 

 large areas of the country in which the common or Domestica 

 plums do not succeed, either becauisie of too great cold, too great 

 heat or the serious ravages of the shot-hole fungus. In neairly 



