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Investigating the horizontal transmission of the Cydia pomonella granulovirus (CpGV) in a model system
Authors:Susanne B. Steineke  Johannes A. Jehle  
Affiliation:Laboratory of Biotechnological Crop Protection, Department of Phytopathology, Agricultural Service Center Palatinate, Breitenweg 71, 67435, Neustadt an der Weinstr, Germany
Abstract:Repeated applications of Cydia pomonella granulovirus (CpGV) can effectively control the codling moth (CM) in apple orchards. However, it is still unknown whether horizontal transmission of the virus from infected to uninfected larvae contributes to the efficacy of the virus insecticide. Horizontal transmission of CpGV was assayed using detached apples. In experiments using artificially applied virus dots on the apple’s surface or infected CM larvae as virus inoculum, it was found that the likelihood of infection of healthy CM larvae relied mainly on the larval behavior. The amount of virus inoculum, either applied artificially or produced by the infected larvae, impacted the infection rate only to a small degree. In the experiments, CM larvae exhibited a strong preference in entry sites, increasing the chance for horizontal transmission. Depending on the experimental design, horizontal transmission rates of about 40% were observed in laboratory assays.
Keywords:Cydia pomonella   Codling moth   Cydia pomonella granulovirus   CpGV   Baculovirus   Horizontal transmission
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