298 MANUAL OF FRUIT DISEASES 



Arthur, J. C. Spotting of peaches and cucumbers. Indiana Agr. 



Exp. Sta. Bui. 19 : 5-10. 1889. 

 Scott, W. M., and Quaintance, A. L. Spraying peaches for the control 



of brown-rot, scab, and curculio. U. S. Agr. Dept. Farmers' bul. 



440 : 6-40. 1911. 

 Scott, W. M., and Ayers, T. W. The control of peach brown-rot and 



scab. U. S. Agr. Dept. Plant indus. Bur. Bul. 174 : 7-26. 1910. 

 Selby, A. D. Peach scab. Ohio Agr. Exp. Sta. Bul. 92 : 220-222. 



1898. 

 Blake, M. A., and Farley, A. J. Peach scab. New Jersey Agr. Exp. 



Sta. Bul. 236:4-30. 1911. 



CROWN-GALL 

 Caused by Bacterium tumefaciens E. F. Smith and Townsend 



Although regarded as harmful wherever it occurs, the best 

 authorities have raised the question whether real injury results 

 from crown-gall. Its progress is slow, and cases are on record 

 where trees affected in the nursery, when planted in the orchard, 

 made productive and profitable trees. On the contrary it is held 

 that if a peach is affected at planting, it will never fruit success- 

 fully, and will show a marked dwarfing. It would seem, there- 

 fore, that the question of the effect of crown-gall on peaches 

 and other fruit-trees needs further attention. In certain regions 

 as much as 75 per cent of the trees in nurseries are affected. 

 Referring to extreme cases illustrating the possible economic 

 importance of crown-gall to peaches, it is reported that peach 

 orchards are unprofitable because of the disease. The disease 

 appears to be more easily communicated to the peach under 

 ordinary orchard conditions than to the apple, consequently 

 great precaution should be taken against setting peach-trees 

 in soil where another galled plant has been removed. 



For a fuller discussion of the disease, see Apple, page 108. 



REFERENCES 

 See those listed under Apple, page 112. 



