54 The Horticulturisf s Rule- Book. 



Pear (Scab), continued. 



Bemedj/.— Spray several times during June and July with 

 ammoniacal carbonate of copper or Bordeaux mixture. 



Plane-Tree. Leaf-Scorchixg (GlcBosporium nervisequum, Sacc). 

 — Attacks the leaves in spring, causing them to appear as if 

 scorched. They finally fall off. Attacks both the native and 

 oriental planes. 



Remedy. — Burn all leaves when they fall. Spray with cop 

 per compounds. 



Plum. Brown-Rot.— See under Cherry. 

 Leaf-Rust (Puccinia praiii-spinoscB, Pers.). — Small round 

 powdery spots of yellowish brown on the under surface of 

 the leaves, and reddish spots on the upper surface directly 

 above them. 



Remedy. — Spray trees earlj'^ in the season with Bordeaux 

 mixture, ammoniacal carbonate of copper, eau celeste, or 

 other fungicides. 

 Plum-Knot or Plum-Wart (PlowrigMia [Sphceria] morbosa, 

 Sacc). — A black and irregular swelling, from one to five or 

 six inches long, appearing on the small limbs of plum and 

 cherry. Peculiar to America. A very serious disease. 



Remedies.— Burn all affected parts in the fall. If the knot 

 is found upon a large limb or trunk, cut it out and wash the 

 wound with sulphate of copper. Wash the parts as soon as 

 the swelling begins to appear, with linseed oil, turpentine or 

 kerosene, using the two latter with caution. A paint of red 

 oxide of iron in linseed oil is recommended. Probably spray- 

 ing Avith strong copper sulphate solution (10 per cent, solu- 

 tion) or similar mixtures in winter or early spring will prove 

 to be valuable remedies. All remedies are uncertain. 

 Plum-leaf or Shot-hole Fungus {Septoria cerasina, Peck; 

 CylindrospoHum Padi) .—A-pi>ears as spots upon the leaves in 

 July, and these spots assume definite outlines, and often fall 

 out, leaving holes like shot-holes. The leaves fall early, pre. 

 venting the fruit from maturing. The disease is sometimes 

 designated simply "Falling of the leaves." 



Remedies. — Burn leaves as soon as they fall. Bordeaux 

 mixture or ammoniacal carbonate of copper applied several 

 times during the season, beginning as soon as the leaves 

 appear. 



