186 MANUAL OF FRUIT DISEASES 



to young trees only. The removal of diseased and dead bark 

 has several advantages. Such operations should prevent the 

 further spread of the bacteria in a given canker. The elimina- 

 tion of dead bark from cankers in which the bacteria have 

 ceased activity will permit more rapid healing of the wound. 

 The removal of diseased bark also means the removal of a source 

 of the trouble. The trees should be inspected late in the winter 

 and early in the spring for new infections. All discolored bark 

 should be removed as advised for fire-blight cankers (page 23) . 

 All wounds should be disinfected with corrosive sublimate 

 1-1000, and a wound-dressing should be applied. These 

 measures should give effective results. 



It is suggested that trunks and limbs be wrapped with burlap 

 or coarse cloth until the young tree passes the danger-point. 

 This method is as yet in the experimental stage and should be 

 used with this fact in mind. 



The use of mazzard seedlings on which desirable varieties 

 may be grafted is strongly advised. These stocks show striking 

 resistance to gummosis. The buds should be set in the limbs 

 and not in the trunks ; this prevents the spread of the bacteria 

 from one limb to another. The grower is cautioned concerning 

 mazzard seedlings : various sweet cherry seedlings are probably 

 sold under the name of mazzard. Some growers raise their 

 own seedlings. The feasibility of this practice must be deter- 

 mined by the grower. (See also general discussion of Gum- 

 mosis under Peach, page 303.) 



REFERENCES 



Barss, H. P. Cherry gummosis. Oregon Crop Pest and Hort. Bienn. 



Kept. 1911-1912 : 199-217. 1913. 

 Barss, H. P. Bacterial gummosis or bacterial canker of cherries. 



Oregon Crop Pest and Hort. Bienn. Kept. 1913-1914 : 224-240. 



1915. 

 Rees, H. L. 'Bacterial gummosis of cherries. Washington Agr. Exp. 



Sta. Monthly bul. 3:2: 12-16. 1915. 



