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 tht 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. Jn The Fruit Industry 
in New York State. New York Agr. Dept. Bul. 79: 1039-1048. 
1916. 
Whetzel, H. H., and Stewart, V. B. Fire blight of pears, apples, 
quinces, etc. Cornell. Univ. Agr. Exp. Sta. Bul. 272: 31-51. 
1909. 
Jones, D. H. Bacterial blight of apple, pear, and quince trees. On- 
tario Agr. Col. Bul. 176: 1-63. 1909. 
Stewart, V. B. The fire blight disease in nursery stock. Cornell 
Univ. Agr. Exp. Sta. Bul. 329: 328-371. 1913. 
Sackett, W. G. Hold-over blight in the pear. Colorado Agr. Exp. 
Sta. Bul. 177: 2-8. 1911. 
Pickett, B. S. The blight of apples, pears and quinces. Illinois Agr. 
Exp. Sta. Cire. 172:3-8. 1914. 
Waite, M. B. The cause and prevention of pear blight. U.S. Agr. 
Dept. Yearbook 1896 : 295-300. 1896. 
