Pear, Plum. 339 



sity of treating the pest before much damage is done. Appli- 

 cation should be made seasonably and thoroughly. 



PLANE-TREE. 



See SYCAMORE. 



PLUM. 

 FUNGOUS DISEASES. 



Brown Rot. See under PEACH. 



Leaf Blight; Shot-hole Fungus (Cylindrosporium Padi ; Sep- 

 toria cerasina, Peck). Description. The foliage of plums and 



FIG. 76. Shot-hole fungus of plum. 



cherries is often disfigured in early summer by small circular 

 spots about an eighth of an inch in diameter. The spots are at 

 first of a purple color, but later, as the tissue dries, the color 

 changes to brown, and the affected areas become loosened and 

 drop out. This causes the leaves to appear as if pierced by 

 shot, as they are frequently full of these small, round holes 

 (Fig. 76). In such cases the foliage turns yello.w, drops during 

 the summer, and the trees are unable to mature their fruit. 

 Tf unchecked, the fungus may cause serious losses, but fortu- 

 nately the disease is easily controlled. 



