Colorado Pi.ant Diseases 
27 
On tlio leaves brownish circular spots are formed which lead to 
premature shedding of the foliage. 
Black rot may be controlled by carefully cutting out all infected 
branches and spraying with (4-4-50) Bordeaux mixture. The first 
spray should be applied about the middle of July and should be 
Black rot of apple, i — Early stages of infection on fruit. 2 — Late^ stage 
on fruit. 3 — On leaves. (After Hesler.) 
followed by a second application about two weeks later. The lime 
sulfur spray recommended for control of scab may be substituted 
for Bordeaux mixture if applied sufficiently late in the season. 
Bordeaux mixture, however, is said to be more effective. 
Bitter Rot (Glomerella cingulata) (9), (10) — The distribution 
