Entomophthoralean fungi overwinter with the bird cherry-oat aphid on bird cherry trees

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt

Dokumenter

  • Fulltext

    Forlagets udgivne version, 13,5 MB, PDF-dokument

  • Stéphanie Saussure
  • Jensen, Annette Bruun
  • Marie L. Davey
  • Annette Folkedal Schjøll
  • Karin Westrum
  • Ingeborg Klingen

In Scandinavia, the bird cherry-oat aphid Rhopalosiphum padi overwinter as eggs on the bird cherry tree Prunus padus. Branches of P. padus were collected at the late February / early March from 17 locations in Norway over a three-year period. We found 3599 overwintering aphid eggs, 59.5% of which were dead. Further, a total of 879 overwintering fungus-killed cadavers were observed. These cadavers were found close to bud axils, where overwintering eggs were also usually attached. Cadavers were infected with either Zoophthora cf. aphidis or Entomophthora planchoniana. All the fungal-killed cadavers were filled with overwintering structures of Z. cf. aphidis (as resting spores) or E. planchoniana (as modified hyphal bodies). We found a significant negative correlation between eggs and cadavers per branch. However, both numbers of eggs and cadavers varied greatly between years and among tree locations. This is the first report of E. planchoniana overwintering in R. padi cadavers as modified hyphal bodies. We discuss whether P. padus may act as an inoculum reservoir for fungi infecting aphids in cereals in spring.

OriginalsprogEngelsk
Artikelnummer107971
TidsskriftJournal of Invertebrate Pathology
Vol/bind200
Antal sider12
ISSN0022-2011
DOI
StatusUdgivet - 2023

Bibliografisk note

Funding Information:
We are thankful to Monica Skogen (NIBIO) for the molecular laboratory work, Marta Bosque Fajardo (NIBIO) for helping to collect the aphid egg and cadaver data, and Robert Banfi (NIBIO) for illustrating Fig. 1. We also thank two anonymous reviewers and the editor, Dr. Richard A. Humber, for their valuable suggestions and comments that helped improve our manuscript. The Norwegian Agricultural Extension Service (NLR) and people at several NIBIO locations around the country are also thanked for collection of bird cherry branches. This study was funded by the Research Council of Norway through the project SMARTCROP (project number 244526).

Funding Information:
We are thankful to Monica Skogen (NIBIO) for the molecular laboratory work, Marta Bosque Fajardo (NIBIO) for helping to collect the aphid egg and cadaver data, and Robert Banfi (NIBIO) for illustrating Fig. 1 . We also thank two anonymous reviewers and the editor, Dr. Richard A. Humber, for their valuable suggestions and comments that helped improve our manuscript. The Norwegian Agricultural Extension Service (NLR) and people at several NIBIO locations around the country are also thanked for collection of bird cherry branches. This study was funded by the Research Council of Norway through the project SMARTCROP (project number 244526).

Publisher Copyright:
© 2023 The Author(s)

ID: 363060725