EVIDENCE OF PYRETHROIDTOLERANCE IN THE BIRD CHERRY-OAT APHID RHOPALOSIPHUM PADI IN IRELAND

• Published in: Outlooks on pest management Vol. 31; no. 1; pp. 5 - 9
• Main Authors: Walsh, Lael, Ferrari, Ester, Foster, Stephen, Gaffney, Michael T
• Format: Journal Article
• Language: English
• Published: Saffron Walden Research Information Ltd 01.02.2020
• Subjects: Amino acid substitution; Amino acids; Barley; Binding sites; Bioassays; Birds; Cereal crops; Cereals; Crop damage; Crop yield; Damage prevention; Enzymes; Evolution; Hordeum vulgare; Insecticide resistance; Insecticides; Insects; Leucine; Mutation; Pest control; Pest resistance; Pesticides; Plant protection; Point mutation; Population; Pyrethroids; Rhopalosiphum padi; Sitobion avenae; Sodium; Sodium channels (voltage-gated); Vectors; United Kingdom > UK; Ireland; British Isles
• ISSN: 1743-1026; 1743-1034
• DOI: 10.1564/v31_feb_02

Resistance to pyrethroid insecticides detected in S. avenae populations in the British Isles is attributed to a point mutation on one allele of the voltage-gated sodium channel (VGSC) gene which has led to an amino acid substitution of leucine to phenylalynine in the sodium channel protein, the target binding site for pyrethroids, affecting the binding affinity of the pyrethroid compound (Foster et al., 2014). Pyrethroids are the main insecticides applied as crop protection compounds to combat aphids in cereal crops in the British Isles (Garthwaite et al, 2016), mainly to prevent direct crop damage, a rare event, and the transmission of BYDV (Figure 1) which severely impacts grain yield (Larsson, 2005). Detection of Pyrethroid Resistance Clonal lineages (Table 1) were started using individual non-winged asexual parent aphids reared on spring barley, Hordeum vulgare var. Propino in long-term cage colonies at 20°C under a 16:8 h (long day) light: dark photoperiod. Implications for Pest Management This evidence of pyrethroid resistance in a single clonal lineage of R. padi in Ireland, previously undocumented in the British Isles, suggests an imminent challenging growing environment for cereal producers who may be dealing with two partially resistant aphid vectors of BYDV.