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Black Olive Scale Saissetia oleae (Olivier) -- Hemiptera:
Coccidae |
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Black olive
scale is a periodic pest of citrus in southern California and a consistent
pest of olives in the San Joaquin Valley.
It was introduced into the United States and California sometime
before 1880. It now occurs in many
regions of the world and infests a wide range of plants. Black olive scale is
thought to be native to Africa. Until
its natural enemy Metaphycus helvolus
was introduced from South Africa (1937), black scale was a severe pest of
citrus in southern California.
Although widely established, this natural enemy does not suppress
black scale on a consistent basis.
This is mainly a pest of citrus in coastal and inland southern
California and of olives in the San Joaquin Valley. It occurs at low levels on citrus in the San Joaquin Valley but
is rarely an economic problem. I n
the lower elevation deserts where biological control is not always effective,
black scale is occasionally treated with insecticide. 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.
The species of the insidiosus
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1988. Introduction of
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the black scale [Saissetia
oleae (Bernard)] in
Greece. Ann. Inst. Phytopath. Benaki, N.S. 5: 353-77. Argyriou, L. C. 1984. Present status of parasite complex in
olive groves in Greece, p. 177-78. In:
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and Biological Control. Final Report 1979/83. Comm. European Comm., Directorat, Luxembourg. Argyriou, L. C. & P. DeBach.
1968. The establishment of Metaphycus helvolus (Compere) (Hym. Encyrtidae)
on Saissetia oleae (Bern) (Hom. Coccidae) in
olive groves in Greece. Entomophaga
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residues to hymenopterous parasites and coccinellid predators. J. Econ. Ent. 56: 694-98. Bartlett,
B. R. 1969. The biological control campaigns against
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1966. The biology and
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