352 MANUAL OF FRUIT DISEASES 
which the scions are set. This type of trouble, while itself 
not common, illustrates what a wound parasite like P. Cydonie 
is capable of doing. (For fuller discussion see Apple, page 45.) 
Brown-Rot 
Caused by Sclerotinia cinerea (Bon.) Schrét. 
Outbreaks of brown-rot due to the above-named fungus are 
not at all common in America, although European growers 
encounter a similar trouble frequently. It is better known on 
the apple than on the pear in this country. The blossoms, 
fruits and branches are susceptible, and when affected the 
various phases are referred to respectively as blossom-blight, 
brown-rot, and brown-rot canker. Recently a brown-rot 
canker has been described from Oregon, but it has not been 
definitely determined whether the fungus concerned is S. 
cinerea or another species. 
Bitter-Rot 
Caused by Glomerella cingulata (Stoneman) Sp. and von S. 
Fortunately for the pear-grower bitter-rot is never as com- 
mon and destructive to the pear as to the apple. Whereas 
apple bitter-rot ranks second in importance only to apple-scab 
over the country as a whole, pear bitter-rot is rare and has 
never been found doing extensive damage. The fungus, G. 
cingulata, was reported as causing cankers on both young and 
old trees in Texas a few years ago. Characteristics of the 
disease on the fruit and woody portions of the tree, together 
with a description of the life-history and control of the patho- 
gene, are given in some detail under Apple, page 14. 
