WOUND DRESSINGS ON APPLE TREES 



11 



DRESSING No. 541 



DRESSING No. 54I + GAS0LINE 



DRESSING NO. 540 



DRESSING No. 540 + GASOLINE 



SHELLAC 



WHITE LEAD AND LINSEED OIL 



CHECK (NO TREATMENT) 



OCT, NOV. 



DEC.JAN..FEB. MAR, APR, MAY JUNE. JULY. AUG.SEPT. 

 MONTHS OF WOUNDING 



Figure 5. — Diagrams of average wounds in October or November of the second 

 growing season after treatment determined by grouping into four seasonal 

 groups the data by months in figure 2. In the diagram, the circle represents 

 the original wound (25 millimeters in diameter) and the ellipse, the shape of 

 the wound when measured. The longitudinal diameter of the wound is repre- 

 sented by the long axis of the ellipse and the transverse diameter by the short 

 axis. The shaded areas between circle and ellipse represent healing callus, and 

 the unshaded parts of the ellipse outside the circle represent extension or en- 

 largement of the original wound. Each diagram in the first column was based 

 on the average of approximately 20 wounds, each in the second and third 

 columns on approximately 30 wounds, and each in the fourth column on 

 approximately 40 wounds. 



