PEACH DISEASES 293 
Peach-rosette differs from yellows in the more tufted char- 
acter of the growths; in the absence of premature ripening 
of the fruit; more rapid destruction; and usually rosette is 
confined to the tips of branches, occurring but rarely on trunks 
and at the base of main limbs. It resembles yellows in the 
pushing out of dormant (adventitious) buds which develop 
diseased branches; the dormant buds tend to unfold in the 
summer and autumn; and only a portion of a tree may be 
affected, whereas the remainder is normal. 
Cause. 
This disease does not seem to be due to plant or animal par- 
asites, nor to any chemical ferment. On the other hand, there 
is the slight possibility that it is caused by a bacterium which 
as yet has not been seen. The disease is contagious; the 
causal factor, whatever it may be, is readily spread by bud-inoc- 
ulation, by root-grafting, or by blowing leaves. There are 
doubtless other ways by which it is spread, but as yet they have 
not come to light. Within two to ten months after a tree is 
inoculated first signs of the rosette disease are apparent. 
Control. 
The prevention of rosette is not known to be possible. All 
affected trees should be promptly destroyed. This should be 
done early in the spring as soon as the disease appears, and 
before the leaves fall. In those regions where the disease is 
present, attention should be given to the plum, which at times 
shows symptoms of rosette similar to those described for the 
peach. 
REFERENCES 
Smith, E. F. Additional evidence on the communicability of peach 
yellows and peach rosette. Part II.— Peach rosette. U. S. 
Agr. Dept. Veg. Path. Div. Bul. 1: 45-58. 1891. 
Smith, E. F. Peach yellows and peach rosette. U: 8. Agr. Dept. 
Farmers’ bul. 17: 5-20. 1894. 
Smith, E. F. The peach rosette. Journ. Mye. 6 : 143-148. 1891. 
Smith, E. F. Additional notes on peach rosette. Journ. Mye. 7: 
226-232. 1893. 
