390 



INSECTS INJURIOUS TO THE ORANGE. 



over both leaves and fruit, making them appear very unsightly. 

 This is a minute fungous growth, known under the name of 

 Fumago salicina Farlow, but it is believed by some to result 

 from the punctures of insects, causing an exudation, on which 

 the fungus thrives. 



As a remedy, use an alkaline solution of soap as strong as 

 the tree will bear without injury. 



No. 250. — The Purple Scale. 



Mytilaspis citricola Packard. 



This is one of the most common and injurious species of 

 scale-insect found in Florida. It is confined mainly to the 



leaves and fruit of the orange, and sometimes disfigures the 

 latter to such an extent as to make it unfit for market, yet 

 it is often seen on fruit offered for sale. The scale of the 

 female is shown empty at a in Fig. 400, and occupied by 



