DISEASES OF THE ORANGE IN FLORIDA. I 53 



The following paragraphs are taken from the 

 Journal of Mycology, published by the Agricultural 

 Department of the United States for 1891 : 



1. Nature of the Disease. This disease first makes 

 its appearance in the form of whitish or cream- 

 colored spots, more commonly on the under side 

 of the leaf, but often on the upper side, and occa- 

 sionally on the young twigs and fruit. Those on 

 the leaf are often accompanied by a depression or 

 pit on the opposite side. These spots grow larger 

 and often coalesce ; ultimately they turn dark, and 

 if abundant the leaf becomes badly curled, twisted, 

 or otherwise distorted, and more or less covered with 

 the wart-like eruptions which the disease has de- 

 veloped. 



2. Distribution. The disease is widespread ; in a 

 few localities it does not seem to be regarded as 

 anything serious. In other localities, where it is 

 more abundant, it is becoming the source of much 

 alarm. It is not confined to young trees, but at- 

 tacks equally young and old stock. While more 

 abundant on the wild orange it is by no means 

 confined to it, nor even to sour stock. We saw it 

 on wild orange trees very commonly, on grape 

 fruit and lemon trees frequently, and on sweet 

 orange trees rarely. 



3. Causes. Professor F. L. Scribner, who made 



