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Establishing a BYDV and aphid-monitoring network

Establishing a BYDV and aphid-monitoring network to support IPM strategies in Ireland

Maximilian Schughart, Teagasc Walsh Scholar, University College Dublin

The Grain Aphid, Sitobion avenae is a main vector of the Barley Yellow Dwarf Virus (BYDV), a virus that can cause significant yield loss in Irish cereals. In terms of the infection of newly emerging crops, little is certain about the epidemiology of BYDV, however migrating aphids and/or aphids carried over from previous crops are thought to be the primary reinfection routes. To better understand the spread of BYDV by migrating aphids, a network of 12m high suction traps is being established, with units in Carlow and Cork operational and an additional tower to be set up north of Dublin in 2021. This network will improve surveillance of both virus carrying and insecticide resistant aphids. Results from 2020 indicate that a partially pyrethroid resistant S. avenae clone (SA3) remains prominent in Ireland with 22% (16/72) of captured aphids showing partial resistance. To further investigate the impact of SA3 on BYDV spread, comparative studies on the virus transmission capability of partially resistant and non-resistant S. avenae will be conducted in collaboration with INRAE in France. By combining in-field and landscape scale monitoring, we aim to be able to predict BYDV occurrence and the occurrence of insecticide resistant aphid populations in the future. This will provide stakeholders with an accurate decision support system as part of a broader IPM strategy to mitigate the impact of BYDV.