ECONOMIC IMPORTANCE OF FUNGI 
293 
Ireland, in 1846-47. (The disease known as "little pota- 
toes" (Rhizoctonia) and by various other names (Fig. 213), 
is caused by one of the Basidiomycetes.) 
283. Ascomycetes. Among diseases caused by various 
species of sac-fungi are the following: 
FIG. 215. Ergot (Claviceps pur pur ea). Sclerotia on wild rye (Elymus 
virginicus), at left; marsh grass (Spariina sp.), middle; cultivated rye 
(Secale cereale), at right. 
1. Peach leaf -curl, plum pockets, and "witches brooms" 
(Fig. 214). 
2. Brown rot of peach and plum. The damage caused 
by this disease in the state of Georgia alone, in 1900, 
amounted to nearly $700,000. 
