Entomophthoralean fungi overwinter with the bird cherry-oat aphid on bird cherry trees
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Entomophthoralean fungi overwinter with the bird cherry-oat aphid on bird cherry trees. / Saussure, Stéphanie; Jensen, Annette Bruun; Davey, Marie L.; Schjøll, Annette Folkedal; Westrum, Karin; Klingen, Ingeborg.
I: Journal of Invertebrate Pathology, Bind 200, 107971, 2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Entomophthoralean fungi overwinter with the bird cherry-oat aphid on bird cherry trees
AU - Saussure, Stéphanie
AU - Jensen, Annette Bruun
AU - Davey, Marie L.
AU - Schjøll, Annette Folkedal
AU - Westrum, Karin
AU - Klingen, Ingeborg
N1 - Publisher Copyright: © 2023 The Author(s)
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
KW - Biological control
KW - Entomopathogenic fungi
KW - Overwintering structures
KW - Primary infections
U2 - 10.1016/j.jip.2023.107971
DO - 10.1016/j.jip.2023.107971
M3 - Journal article
C2 - 37429542
AN - SCOPUS:85165068969
VL - 200
JO - Journal of Invertebrate Pathology
JF - Journal of Invertebrate Pathology
SN - 0022-2011
M1 - 107971
ER -
ID: 363060725