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ViewAttendees 8

P-IE

Section Symposium

Fundamental Biology to Practical Management of Ambrosia Beetles in Horticultural Tree Agroecosystems

3: Fungal pathogen and ethanol content affect ambrosia beetle host selection and colonization success

Tuesday, November 17, 2020

12:55 PM - 1:10 PM EST

Presenting Author(s)

Davide Rassati

University of Padova
Udine, Italy

Co-Author(s)

CM

Contarini Mario

Department of Agriculture and Forest Sciences (DAFNE), Università degli Studi della Tuscia
Viterbo, Lazio, Italy
Christopher M. Ranger (he/him/his)

USDA
Wooster, Ohio
MF

Massimo Faccoli

Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), Università degli Studi di Padova
Padova, Veneto, Italy
ML

Marini Lorenzo

Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), Università degli Studi di Padova
Padova, Veneto, Italy
SS

Speranza Stefano

Department of Agriculture and Forest Sciences (DAFNE), Università degli Studi della Tuscia
Viterbo, Lazio, Italy
RL

Rossini Luca

Department of Agriculture and Forest Sciences (DAFNE), Università degli Studi della Tuscia
Viterbo, Lazio, Italy
GC

Giacomo Cavaletto

Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), Università degli Studi di Padova
Padova, Veneto, Italy

Ambrosia beetles (Coleoptera; Curculionidae; Scolytinae) are worldwide recognized as successful invaders. At present more than 50 ambrosia beetle species are known to be established outside their native range, including some serious pests of trees growing in natural and managed habitats. Understanding factors affecting host selection and colonization success has been identified as a research priority to improve chances of ambrosia beetle management and control. Ambrosia beetles exhibit broad host ranges but a narrow preference based on the condition of the host. Tissues infected by pathogens or containing ethanol can facilitate attacks by ambrosia beetles, although it still remains unclear how these factors interact. We first tested whether trap logs infected with the causal agent of chestnut blight Cryphonectria parasitica and subsequently treated with ethanol (i.e. baited with ethanol lures, soaked in ethanol or untreated) affect host selection and colonization success of ambrosia beetles. We next assessed how these mechanisms are affected by varying ethanol concentrations. Ethanol-soaked logs were more attractive to Anisandrus dispar than ethanol-baited logs or untreated logs, although this difference was more evident in uninfected than infected logs. The ethanol concentration in tree tissues affected host selection and colonization success, although the effect varied depending on the beetle species. This contrasting response could be a niche-partitioning mechanism based on ethanol within host tissues.