Applied and Environmental Microbiology (2017) 83 (2 - e02330-16)

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J.A. Jehle, S. Schulze-Bopp, K. Undorf-Spahn and E. Fritsch (2017)
Evidence for a second type of resistance against Cydia pomonella granulovirus in field populations of codling moths
Applied and Environmental Microbiology 83 (2 - e02330-16)
Abstract: Cydia pomonella granulovirus (CpGV) is an important biocontrol agent for the codling moth (CM) in organic and integrated apple production worldwide. Previously, Z chromosome-linked dominant resistance in at least 38 CM field populations in Europe was reported, threatening organic apple production. Growers responded by switching to a different resistance-breaking isolate of CpGV that could control these populations. Here, we report a nonuniform response of different CM field populations to CpGV isolates from CpGV genome groups A to E. Even more strikingly, one field population, NRW-WE, was resistant to all known CpGV genome groups except group B. Single-pair crossing experiments with a susceptible strain, followed by resistance testing of the F1 offspring, clearly indicated cross-resistance to CpGV isolates that had been considered to be resistance breaking. This finding provides clear evidence of a second, broader type of CpGV resistance with a novel mode of inheritance that cannot be fully explained by Z-linkage of resistance.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Johannes A. Jehle

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Cydia pomonella Apple (Malus) Germany
Cydia pomonella granulovirus (entomopathogen) Cydia pomonella Apple (Malus)