456 ECONOMIC ZOOLOGY AND ENTOMOLOGY 



spray or even by fumigation, nor will the fumigation affect 

 the eggs. On badly infested trees it is usually necessary to 

 give two treatments, the second about six weeks or two 

 months later than the first, in order that the young which 

 hatch after the first treatment may be killed. The dosage 

 used in fumigating for the purple scale is one-fourth to one- 

 third stronger than that used for the red scale. 



FIG. 216. Purple scale, Lepidosaphes becki. (Much enlarged; after 

 Quayle, photo by Doane.) 



Glover's Scale (Lepidosaphes gloveri). The waxen scale of 

 this insect resembles that of the purple scale, but is longer and 

 narrower and less curved, hence it is often known as the long 

 scale. It is a serious pest in Florida and the Gulf region, but has 

 never become a pest in California. The life history and habits 

 are much the same as those of the purple scale, and the remedies 

 to be used are the same. 



The Chaff Scale (Parlatoria pergandi) . The scales covering 

 the females of this species are whitish, rounded or oval, with 

 the molted skin close to one margin. The scale of the male 

 is similar, but more elongate. They are usually found on the 

 trunk and branches of the tree, but may also occur on the 



