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Partial Loss of Inheritable Type I Resistance of Codling Moth to Cydia pomonella granulovirus

Institute for Biological Control, Julius Kühn-Institut, Heinrichstraße 243, 64287 Darmstadt, Germany
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Viruses 2019, 11(6), 570; https://doi.org/10.3390/v11060570
Received: 22 May 2019 / Revised: 17 June 2019 / Accepted: 19 June 2019 / Published: 20 June 2019
(This article belongs to the Special Issue Insect Viruses and Pest Management)
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Abstract

Current knowledge of the field resistance of codling moth (CM, Cydia pomonella, L) against Cydia pomonella granulovirus (CpGV) is based mainly on the interaction between the Mexican isolate CpGV-M and CpRR1, a genetically homogeneous CM inbreed line carrying type I resistance. The resistance level of laboratory-reared CpRR1 to CpGV-M was recently found to have decreased considerably, compared to the initially high resistance. To understand the background of this phenomenon, CpRR1 larvae were exposed over several generations to CpGV-M for re-selection of the original resistance level. After five and seven generations of selection, new CpRR1_F5 and CpRR1_F7 lines were established. The resistance ratio of these selected lines was determined by full range bioassays. The CpRR1_F5 strain regained a higher level of resistance against CpGV up to 104-fold based on LC50 values compared to susceptible larvae (CpS), which indicated that the absence of virus selection had resulted in a reduction of resistance under laboratory rearing conditions. In addition, some fitness costs of fecundity were observed in CpRR1_F5. Single-pair crossings between CpRR1_F5 or CpRR1_F7 with susceptible CpS moths revealed a dominant but not fully sex-linked inheritance, which suggests a partial loss of previous resistance traits in CpRR1. View Full-Text
Keywords: Baculoviridae; Betabaculovirus; pest control; resistance; mass crossing; single-pair crossing; fitness cost Baculoviridae; Betabaculovirus; pest control; resistance; mass crossing; single-pair crossing; fitness cost
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Fan, J.; Wennmann, J.T.; Jehle, J.A. Partial Loss of Inheritable Type I Resistance of Codling Moth to Cydia pomonella granulovirus. Viruses 2019, 11, 570.

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