298 MANUAL OF FRUIT DISEASES 
Arthur, J. C. Spotting of peaches and cucumbers. Indiana Agr. 
Exp. Sta. Bul. 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: 640. 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 thecontrary itis 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. 
