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Evidence for a Second Type of Resistance against Cydia pomonella Granulovirus in Field Populations of Codling Moths.

Authors
  • Jehle, J A1, 2
  • Schulze-Bopp, S3, 2
  • Undorf-Spahn, K3
  • Fritsch, E3
  • 1 Institute for Biological Control, Julius Kuehn Institute, Darmstadt, Germany [email protected] , (Germany)
  • 2 Institute for Phytopathology, Agricultural Service Center Palatinate (DLR Rheinpfalz), Neustadt an der Weinstrasse, Germany. , (Germany)
  • 3 Institute for Biological Control, Julius Kuehn Institute, Darmstadt, Germany. , (Germany)
Type
Published Article
Journal
Applied and Environmental Microbiology
Publisher
American Society for Microbiology
Publication Date
Jan 15, 2017
Volume
83
Issue
2
Identifiers
DOI: 10.1128/AEM.02330-16
PMID: 27815280
Source
Medline
Keywords
License
Unknown

Abstract

CpGV is registered and used in virtually all commercial apple growing areas worldwide and is therefore the most widely used baculovirus biocontrol agent. Recently, resistance to CpGV products was reported in different countries in Europe, threatening organic growers who rely almost exclusively on CpGV products. This resistance appeared to be targeted against a 24-bp repeat in the pe38 gene in isolate CpGV-M of genome group A, which had been used commercially for many years. On the other hand, resistance could be broken by CpGV isolates from CpGV genome groups B to E. Here, we report clear evidence of a second type of field resistance that is also directed against resistance-breaking isolates of CpGV genome groups C, D, and E and which appears not to be targeted against CpGV pe38 Therefore, we propose to differentiate between type I resistance, which is targeted against pe38 of CpGV genome group A, and a novel type II resistance with an unknown molecular target. This finding stresses the need for further adoption of resistance management strategies for CpGV, since growers cannot rely solely on the use of resistance-breaking CpGV isolates.

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