48 
Colorado Experiment Station 
Plate XVII. Fig. 1. Frost injury on apples. Fig. 2. Leaves blistered by frost. Fig. 3. 
Pears deformed as a result of frost injury. 
affected, turn yellow, and fall. In some instances the affected sur¬ 
face may slough off. The effect produced may sometimes resemble 
shot-hole of plum and cherry. 
Control .— (t) Use pure chemicals. 
(2) Apply spray as a fine mist, using high pressure and good 
nozzles. 
(3) Apply spray in clear weather. 
(4) Stir solution well before application. 
