336 MANUAL OF FRUIT DISEASES 



under ordinary conditions. If spraying has been neglected in 

 the past, then more than three applications will be necessary on 

 account of the constant source of trouble on the twigs. A 

 dormant spraying is advised for the far West. This is done 

 late in the winter to kill the fungus on the twigs. A second 

 dormant spraying is recommended in California, to be made 

 just before the buds swell. Other applications follow: (1) a 

 few days before the blossoms open ; blossom-buds exposed and 

 separated ; (2) when the blossoms have for the most part 

 fallen; (3) two weeks after the second application. In the 

 East the two dormant sprayings advised for California condi- 

 tions are not practiced for scab, although many pear orchards 

 are sprayed just before the buds swell for blister-mite. The 

 value of this application for scab needs investigation. Lime- 

 sulfur 1-50, or bordeaux mixture 3-3-50, may be used ; the 

 latter is much less desirable on account of the russeting which 

 it produces on the fruit. Since the fungus hibernates in the 

 twigs and fallen leaves, it is advised that in pruning and culti- 

 vation attention be given respectively to the removal of badly 

 infected twigs and to the burial of old leaves. 



REFERENCES 



Smith, R. E. Pear scab. California Agr. Exp. Sta. Bui. 163 : 3-18. 



1905. 

 Clinton, G. P. Report of the botanist. Pear. Scab. Connecticut 



Agr. Exp. Sta. Rept. 1904 : 323-324. 1905. 

 Wallace, E. Lime-sulfur as a summer spray. Control of pear scab. 



Cornell Univ. Agr. Exp. Sta. Bui. 289 : 160-162. 1911. 

 Barrus, M. F. Diseases of pears. Pear scab. In The Fruit Industry 



in New York State. New York Agr. Dept. Bui. 79 : 1048-1049. 



1916. 

 Swingle, D. B. Fruit diseases in Montana. Pear scab. Montana 



Agr. Exp. Sta. Circ. 37 : 318-319. 1914. 

 Duggar, B. M. Some important pear diseases. III. Pear scab. 



Cornell Univ. Agr. Exp. Bui. 145 : 616-620. 1898. 

 Jackson, H. S. Diseases of pomaceous fruits. Pear diseases. Scab. 



Oregon Crop Pest and Hort. Bienn. rept. 1911- 1912 : 246-247. 



