120 DISEASES OF GLASSHOUSE PLANTS 
Under glass this disease is rarely of sufficient im- 
portance to warrant special precautions being taken to 
combat it, and can be controlled readily by keeping a 
normal temperature and regulating the moisture con- 
ditions. In the case of outdoor tomatoes spraying with 
Bordeaux or Burgundy Mixture may be necessary to 
effect a control. 
“* Nailhead”’? Spot of Tomatoes.—Another Macro- 
sporium disease of the tomato, caused by Macrosporiuwm 
tomato Cke., is that commonly known as “ Nailhead 
Spot.” This disease, while common in America, is 
unknown as yet in this country. It receives its name 
from the typical more or less circular, reddish-brown 
spots, resembling the head of a nail, which occur on the 
leaves, fruit, and stems of tomato plants suffering from 
the disease. Sometimes the spots possess peculiar ridged 
lines which give them a target-like effect. Spraying 
with Bordeaux Mixture is recommended as a means of 
control. 
