198 



INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



into larvae which begiE feeding very shortly and after three moults, 

 covering nearly ;i week, become oymphs, and after two weeks more the 

 adults emerge from the pupal skins. They feed constantly throughout 

 their existence of some thirty davs as mature insects. 



'♦ *v fy • ? v \* ?». 





f ;- ': ■ -■ 



Fig. 1,1. — The greenhouse white fly, Aaterochiton vapor- 



um West. Larvae, nymphs and adults on the underside 



of a wild blackberry leaf. Enlarged three times. (Original) 



Distribution. — This species occurs in greenhouses in almost every 

 pari of the Stale. Due to the mild climate it also occurs in the open in 



many sect inns, especially in the central and southern parts. 



Food Plants. — Of the cultivated plants, tomatoes and cucumbers 

 seem tn suffer most from the attacks of this pest, though a larger 

 number of other plants are attacked, including Ageratum, aster, bean, 

 begonia, chrysanthemum, coleus, eggplant, fuchsia, geranium, grape. 

 Jerusalem cherry, Lantana, Lettuce, muskmelon, pepper, primrose, rose, 

 sage, blackberry, strawberry and watermelon. 



Control.— Nicotine and soap sprays as recommended for plant lice 

 should be used in dealing with this pest, especially upou lender plants. 

 ( See pages 71 and 72. ) 



