216 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



Saissetia hemisphaerica (Targ) 

 Hemispherical Scale 



This scale (Fig. 89) is very widely distributed, especially in the regions 

 along the coast. In this county (Ventura) it is very numerous along the entire 

 sea-border, feeding on a great variety of plants. The photo shows a normal 

 condition of a Bignonia infested with this scale, growing on the grounds of 

 the County Court House. 



It is a special greenhouse nuisance, working on nearly all the ferns, 

 palms, etc., and has been distributed on such stock. 



Figure 89. Saissetia hemisphaerica. 



The citrus trees do not escape its attacks, but no serious damage has 

 been done to them. The scales usually settle around the edges of the leaves 

 and arc easily recognized by their smooth, hemispherical, brown bodies. At 

 some periods of the year it infests these trees almost as badly as the Black 

 Scale, but is not as persistent. This is especially true in the localities of 

 \'entura and Oxnard. In the interior it is seldom found on the citrus trees 

 at all, and few orchardists know of its existence. 



In the greenhouses it is usually handled with sprays such as Kerosene 

 Emulsions, etc. Fumigation will git it in the orchard. 



The parasite of the 151ack Scale, SciilcUista cyanca, works on tliis scale 

 also with about the same efficiency. 



