166 



INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



Nature of Work.— This insect attacks the leaves, into which they 

 often mine so as to hide themselves. They are also common upon the 

 fruit of the pineapple 

 (Fig. 143). 



Distribution. — The 

 pineapple scale occurs 

 only in greenhouses and 

 is often taken in quar- 

 antine. 



Food Plants.— Acacia, 

 Billbergia z eb rin a, 

 canna, Hibiscus. English 

 ivy, olive, palm, pinguin, 

 fan palm, pineapple and 

 sago palm are often in- 

 fested with this species. 



Control. — Spraying, 

 when the pest occurs in 

 the field, with crude oil 

 or kerosene emulsions 

 and miscible oils gives 

 good results. Infested 

 fruits should be fumi- 

 gated with full schedule 

 No. 1 or with three 

 times this amount if 

 complete eradication is 

 desired. 



Natural Enemies.— 



Aspidioiiphagus citrin us 

 has been reared from 

 this species. 



Fig. 14 3. — The pineapple scale, Diaspis bromeliw 

 (Kern.), on a pineapple. Slightly enlarged. Taken 

 in quarantine by Frederick Maskew. (Original) 



THE JUNIPER SCALE 



Diaspis carueli Targ. 

 (Fig. 144) 



Description. — The female scales are circular, white or light gray, 

 with yellow central or subcentral exuviae. The diameter varies from 

 1-25 to T V inch. The female bodies are nearly circular and yellow. The 

 male scales are snow-white, very small, narrow, with prominent median 

 ridge and yellow exuvia?. They are 1-25 inch long. The adult males 

 are light yellow. 



Life History. — The winter is passed in a half-grown condition and 

 maturity is reached in early summer. The species is quite prolific, 

 but there appears to be but a single brood a year. 



Nature of Work.— This species infests the foliage and cones of the 

 trees, often in such numbers as to make them appear whitewashed. 

 The young green cones are preferred. 



Distribution. — The juniper scale is quite common throughout the 

 State, especially in parks and private gardens. 



