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Life History and Sex Determination in the Diaspine Scale, Pseudaulacaspis pentagona (Targ.) (Coccoidea)

Published online by Cambridge University Press:  31 May 2012

Frederick D. Bennett  and
Spencer W. Brown
Frederick D. Bennett
Affiliation:
Commonwealth, Institute of Biological Control, c./o. I.C.T.A., St. Augustine, Trinidad.
Spencer W. Brown
Affiliation:
Dept. of Genetics, University of California, Berkeley.
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Extract

The increasing body of knowledge about the armored scales is beginning to reveal manv unique aspects in the life cycles of these highly specialized insects. Such information is not only of value to the entomologist and those concerned with the control of scales but is also becoming important in such diverse fields as genetics, ecology, cytology, and physiology; armored scales may well find an expanding place in the laboratory as subjects for researches in a variety of fields. Pseudaulacaspis pentagona (Targ.) has one of the most unusual, yet to date one of the best understood life cycles of the armored scales. Various aspects of its biology have been described by Berlese (1910), Smit (1953), Dustan (1953), and Monti (1955). Accounts of its natural enemies or biological control programs have been given by Berlese (1910) for Italy, by Ogilvie (1928) and Simmonds (1955) for Bermuda, by Bennett (1956) for Trinidad, and Clausen (1956) for Florida. P. pentagona is a pest of economic importance on a wide variety of hosts throughout an extekive geographic distribution (Anon., 1956), and has been cultured extensively in the biological control laboratory for the mass-rearing of scale parasites and predators. Recent investirzations of the sex determining mechanik and chromosome behaviour (Brown and Bennett, 1957) have arain shown unusual processes and relationships, some of which appear to occur in many other species of armored scales. It is the purpose of this paper to describe the life cycle of P. pentagona as it is known from field and laboratory studies and from cytological and genetic investigations.

Type
Articles
Information
The Canadian Entomologist , Volume 90 , Issue 6 , June 1958 , pp. 317 - 324
Copyright
Copyright © Entomological Society of Canada 1958

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