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Virulence of Two Entomophthoralean Fungi, Pandora neoaphidis and Entomophthora planchoniana, to Their Conspecific (Sitobion avenae) and Heterospecific (Rhopalosiphum padi) Aphid Hosts

1
Plant Protection Laboratory, National Institute of Agricultural Research of Tunisia, Rue Hédi Karray, 2049 Ariana, Tunisia
2
Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 3rd floor, 1871 Frederiksberg C, Denmark
3
Institute of Environmental Microbiology, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
4
State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China
5
Institute of Applied Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
6
Department of ABV, National Agronomic Institute of Tunisia, 43 Avenue Charles Nicolle, 1082 EL Menzah, Tunisia
*
Authors to whom correspondence should be addressed.
Insects 2019, 10(2), 54; https://doi.org/10.3390/insects10020054
Received: 3 December 2018 / Revised: 19 January 2019 / Accepted: 2 February 2019 / Published: 13 February 2019
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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. planchoniana infection 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. View Full-Text
Keywords: aphids; Pandora neoaphidis; Entomophthora planchoniana; virulence aphids; Pandora neoaphidis; Entomophthora planchoniana; virulence
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Ben Fekih, I.; Jensen, A.B.; Boukhris-Bouhachem, S.; Pozsgai, G.; Rezgui, S.; Rensing, C.; Eilenberg, J. Virulence of Two Entomophthoralean Fungi, Pandora neoaphidis and Entomophthora planchoniana, to Their Conspecific (Sitobion avenae) and Heterospecific (Rhopalosiphum padi) Aphid Hosts. Insects 2019, 10, 54.

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