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J Invertebr Pathol. 2006 Nov;93(3):201-6. Epub 2006 Sep 5.

Field resistance of codling moth against Cydia pomonella granulovirus (CpGV) is autosomal and incompletely dominant inherited.

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  • 1Laboratory of Biotechnological Crop Protection, Department of Phytopathology, Agricultural Service Center Palatinate (DLR Rheinpfalz), Breitenweg 71, 67435 Neustadt a.d. Wstr., Germany.

Abstract

The current appearance of local codling moth populations with resistance to Cydia pomonella granulovirus (CpGV) is an impediment to continuous CpGV application. Therefore, crossing experiments have been performed in order to gain information about the inheritance of resistance. Evidence is presented that the observed field resistance is stably inherited even under non-selective conditions in the laboratory. Offspring of reciprocal F(1) crosses between a susceptible ('S') and a resistant ('R') strain and backcrosses between F(1) and S were bioassayed at different CpGV concentrations. The resistant strain showed 100 times lower susceptibility in 7-day bioassays. The responses of the reciprocal crosses (male S x female R and female S x male R) did not differ significantly, indicating that resistance is autosomally inherited. The median lethal concentration for the F(1) progeny was intermediate between those of its parental strains. Mortality data obtained from the backcrosses suggested that inheritance of resistance is due to a non-additive, polygenic trait.

PMID:
16908027
DOI:
10.1016/j.jip.2006.07.001
[PubMed - indexed for MEDLINE]
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