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| Black Olive Scale   Saissetia oleae (Olivier) -- Hemiptera: 
  Coccidae     | 
 
                                                                                                                                                
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          In the
  coastal valleys of southern California, black scale has a single annual generation,
  whereas in coastal southern California, it has two generations a year.  On olives in the San Joaquin Valley, black
  scale has a single annual generation but does not infest citrus in this area.  Black scale infests leaves when it is
  young but moves to the young branches when older.  It sucks the sap from leaves and branches and produces a sugary
  exudate that drips onto leaves and fruit. 
  At moderate scale densities, scale exudate supports fungal growth
  (sooty mold) which downgrades fruit in the packinghouse.  At higher densities, scale populations
  decrease fruit size and substantially decrease fruit production the following
  season.          Dr,
  Mark Hoddle of the University of California reported that citrus is one of
  the 10 most important agricultural crops in California, with an annual value
  of $700-$900 million.  The San Joaquin
  Valley produces about 65% of the citrus grown in the state. This percentage
  will increase as more of the citrus in the inland coastal valleys is
  eliminated with encroaching 
  urbanization.  Olives are an
  important California-grown crop, and black scale is a major pest on this
  commodity too.  Control can usually be
  achieved with insecticide treatments.   REFERENCES:                                                                                                 FURTHER
  RELATED REFERENCES   Annecke, D. P. & M. J. Mynhardt.  1972. 
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  1988.  Introduction of
  berneficial insects into Israel for the control of insect pests.  Phytoparasitica 16:  303-15.   Argyriou, L. C.  1963.  Studies on the morphology and biology of
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  B. R.  1969.  The biological control campaigns against
  soft scales and mealybugs on citrus in California.  Proc. 1st Intern. Citrus Symp., Riverside, Calif. 2:  875-78.   Bartlett,
  B. R.  1978.  Coccidae. 
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  the black scale.  Calif. Citrograph
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  J. Econ. Ent. 46: 
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