Insects (2019) 10 (2 - 54)

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Ibtissem Ben Fekih, Annette Bruun Jensen, Sonia Boukhris-Bouhachem, Gabor Pozsgai, Salah Rezgui, Christopher Rensing and Jørgen Eilenberg (2019)
Virulence of two entomophthoralean fungi, Pandora neoaphidis and Entomophthora planchoniana, to their conspecific (Sitobion avenae) and heterospecific (Rhopalosiphum padi) aphid hosts
Insects 10 (2 - 54)
Abstract: Pandora neoaphidis and Entomophthora planchoniana (phylum Entomophthoromycota) are important fungal pathogens on cereal aphids, Sitobion avenae and Rhopalosiphum padi. Here, we evaluated and compared for the first time the virulence of these two fungi, both produced in S. avenae cadavers, against the two aphid species subjected to the same exposure. Two laboratory bioassays were carried out using a method imitating entomophthoralean transmission in the field. Healthy colonies of the two aphid species were exposed to the same conidial shower of P. neoaphidis or E. planchoniana, in both cases from a cadaver of S. avenae. The experiments were performed under LD 18:6 h at 21 °C and a successful transmission was monitored for a period of nine days after initial exposure. Susceptibility of both S. avenae and R. padi to fungal infection showed a sigmoid trend. The fitted nonlinear model showed that the conspecific host, S. avenae, was more susceptible to E. planchonianainfection than the heterospecific host R. padi, was. In the case of P. neoaphidis, LT50 for S. avenae was 5.0 days compared to 5.9 days for R. padi. For E. planchoniana, the LT50 for S. avenae was 4.9 days, while the measured infection level in R. padi was always below 50 percent. Our results suggest that transmission from conspecific aphid host to heterospecific aphid host can occur in the field, but with expected highest transmission success to the conspecific host.
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Database assignments for author(s): Annette Bruun Jensen, Sonia Boukhris-Bouhachem, Salah Rezgui, Jørgen Eilenberg

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection

Pest and/or beneficial records:

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

Sitobion avenae Denmark
Rhopalosiphum padi Denmark
Entomophthora planchoniana (entomopathogen) Sitobion avenae Denmark
Entomophthora planchoniana (entomopathogen) Rhopalosiphum padi Denmark
Pandora neoaphidis (entomopathogen) Sitobion avenae Denmark
Pandora neoaphidis (entomopathogen) Rhopalosiphum padi Denmark