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Selection for increased resistance to a granulosis virus in the potato moth, Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae)

Published online by Cambridge University Press:  10 July 2009

D. T. Briese  and
H. A. Mende
D. T. Briese
Affiliation:
CSIRO, Division of Entomology, P.O. Box 1700 Canberra City, ACT 2601, Australia
H. A. Mende
Affiliation:
CSIRO, Division of Entomology, P.O. Box 1700 Canberra City, ACT 2601, Australia
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Abstract

Serial exposure of a susceptible laboratory strain of Phthorimaea operculella (Zell.) recently obtained from the field to granulosis virus over six generations produced a 140-fold increase in LD50. The evidence suggests that this was due to a change in frequency of a resistance gene within the population. An attempt to select for even greater resistance in an already highly resistant laboratory strain resulted in only a small increase, due mainly to reduced variability in response of the population. The implications of resistance to viral insecticides developing under field conditions are discussed.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 73 , Issue 1 , March 1983 , pp. 1 - 9
Copyright
Copyright © Cambridge University Press 1983

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