VARIOUS SCALE INSECTS 



prune and apricot. It is a very hardy scale, and the remarks about 

 the black scale apply to it also. 



Brown apricot scale (Eulecanium armeniacum). 



Other Lecaniums. There are several other scales on fruit trees : 

 The filbert scale (hemisphericum) , which is common in greenhouses 

 and occurs to limited extent on citrus trees; the frosted scale 

 (pruinosum), very large, oval and convex, covered with dense, 

 whitish bloom, occurs on deciduous fruit trees. 



Hemispherical scale (Saissetia hemispherical). 



Cottony Cushion Scale or Fluted Scale (Icerya purchasi). This 

 promised at one time to be the most grievous of all scales in its 

 rapid increase and wide range of food plants, but it was speedily 

 reduced by an Australian ladybird, Novius (Vedalia) cardinalis, in- 

 troduced by Albert Koebele, with such success that specimens were 

 for a number of years rarely seen, but have recently become abun- 

 dant in some localities. 



