APPLE DISEASES 149 
ROSETTE 
Caused by adverse soil conditions 
This peculiar condition attracted attention in Colorado apple 
orchards following the severe winters of 1898 and 1899. In 1901 
it was particularly noticeable in several orchards of one locality 
in that state. What may prove to be the same trouble has 
subsequently been observed in California and Idaho. Records 
of apple-rosette have not come from any other sources, so that 
the disease seems to be limited in its geographical range. This 
fact alone accounts for the disease being considered as one of the 
minor troubles of the apple. 
Symptoms. 
The rosette of apple is said to present an appearance sugges- 
tive of peach-rosette. The characteristic feature of the disease 
is the presence of a tuft or rosette of small leaves at the ends of 
branches; such branches are otherwise nearly destitute of 
foliage. Affected limbs and even whole trees die from the effects 
of rosette. Inthe spring the lateral buds die, and the terminal 
one develops a clustered branch on which the leaves are much 
more dense than they normally should be; whence the term 
rosette. 
Cause. 
Apple-rosette is called a soil disease. No parasites of any 
kind are concerned. Like most diseases of this sort the true 
cause will probably remain in obscurity for some time to come. 
Conditions accompanying the disease are somewhat as follows: 
in an excess of marl and an adverse water-supply the tree sends 
out few or no fibrous roots. In fact the roots cannot penetrate 
this type of soil to any extent, consequently the tree has a 
shallow root-system, and the water-supply becomes inadequate. 
Accompanying these provoking conditions is winter-injury, 
which comes about in the following way: the water may be in 
sufficient quantities in the early part of the season, but by the 
