DISEASES OF SPECIAL CHOPS 109 



than which it is a much more serious post, and the whole 

 leaf more often takes on a diseased appearance, eventually 

 turning yellow or brown and falling. This disease is also 

 prevalent upon the fruit, where it causes a red spot, which 

 soon becomes darker, and may later be accompanied by 

 cracking similar to that of the pear scab. 



The treatment already recommended for the pear scab 

 will suffice for the pear leaf blight. 



Black rot canker (Sphceropsis malorum Peck). — In 

 appearance and treatment this disease is similar to the 

 black rot of the apple. 



Anthracnose {Colletotrichum sp.). — Diseased pear trees in 

 New Jersey were noted in 1892 by Stevens, nearly every 

 fruit upon the tree being destroyed. While very serious, 

 it is, fortunately, not of frequent occurrence. In nature, 

 cause, and appearance it resembles closely the bitter rot of 

 the apple, and the treatment may be the same as for that 

 disease. 



Hypochnose. See apple. 



Brown rot. See apple. 



Thelephorose {Thelephora pedicellata Schw.). — This 

 appears in the form of spots 5 mm. to 8 cm. or larger 

 on the trunk of the tree near a dormant bud, on branches 

 at the bases of fruit spurs, or at the bases of other branches. 

 The spots are nearly circular, surrounded by a whitish, 

 uneven edge. Older, larger spots are depressed and the 

 bark, cambium, and wood beneath are dark and dead. 



Galloway' recommended excision of the diseased wood, 

 followed by washing with sulphate of iron (copperas) 

 and covering with grafting wax or some similar substance. 



1 Galloway, B. T., Jour. Mycol., 6, 113, 1891. 



