156 ORANGE CULTURE IN FLORIDA. 



be very widespread on the orange-trees in Florida, 

 and the material collected was young and immature. 

 We found it, however, more abundant on Magnolia 

 fcelida, Smilax sp., and other shrubs which were 

 abundantly affected with scale insects. 



3. Causes. In 1876 Dr. W. G. Farlow published 

 an elaborate paper giving a full account of this dis- 

 ease as affecting the orange and olive trees of Cali- 

 fornia, and referring it to a fungus (Capnodium cilri, 

 Berk. & Desrn.) which feeds on the honey dew 

 produced by the bark-lice. While the fungus 

 draws no nourishment from the orange leaves them- 

 selves, it must, if abundant, seriously interfere with 

 the process of assimilation, and therefore be regarded 

 as injurious. 



4. Remedies. In the paper above mentioned, 

 spraying with a strong solution of alkali soap is 

 recommended. The disease has not yet made 

 sufficient progress in Florida to demand much 

 treatment, and with the natural enemies of the scale 

 insect to check their development is not likely to 

 prove a serious difficulty. 



