PEAR DISEASES 331 



beginning with the fall of blossoms, make an inspection every 

 few days of the young trees. Break out the blighted spurs and 

 cut out diseased twigs, making the cut at least six inches below 

 the diseased portion. Disinfect the cuts with corrosive subli- 

 mate, (c) Remove all watersprouts from the trees two or 

 three -times during the season, (d) In the nursery remove the 

 blossom-buds, particularly of the quinces. Here inspection 

 must be frequent, particularly in susceptible stock, in order to 

 keep the disease under control. It is often necessary to inspect 

 certain blocks daily, the diseased twigs being cut out as soon as 

 observed. When budded stock of the first year becomes 

 affected, the trees should be dug out, since cutting below the 

 diseased area causes the trunk of the young tree to be crooked 

 and therefore not marketable, (e) Control the insects ; those 

 which are active in disseminating the blight bacteria have 

 been enumerated (page 327). The real point of attack lies in 

 this phase of the problem. (For discussions of fire-blight on 

 other fruits, see Apple, page 21 ; Apricot, page 159 ; Cherry, 

 page 191 ; Plum, page 386 ; and Quince, page 387.) 



REFERENCES 



Barrus, M. F. Diseases of pears. Fire blight. In The Fruit Industry 

 in New York State. New York Agr. Dept. Bui. 79 : 1039-1048. 

 1916. 



Whetzel, H. H., and Stewart, V. B. Fire blight of pears, apples, 

 quinces, etc. Cornell Univ. Agr. Exp. Sta. Bui. 272:31-51. 

 1909. 



Jones, D. H. Bacterial blight of apple, pear, and quince trees. On- 

 tario Agr. Col. Bui. 176 : 1-63. 1909. 



Stewart, V. B. The fire blight disease in nursery stock. Cornell 

 Univ. Agr. Exp. Sta. Bui. 329 : 328-371. 1913. 



Sackett, W. G. Hold-over blight in the pear. Colorado Agr. Exp. 

 Sta. Bui. 177:2-8. 1911. 



Pickett, B. S. The blight of apples, pears and quinces. Illinois Agr. 

 Exp. Sta. Circ. 172 : 3-8. 1914. 



Waite, M. B. The cause and prevention of pear blight. U. S. Agr. 

 Dept. Yearbook 1895 : 295-300. 1896. 



