No increase in grain aphid pyrethroid resistance found
Recent research reveals no rise in common pyrethroid resistance mutations among English grain aphids in Irish barley since 2018. However, newly discovered genetic changes, including a 'super kdr' mutation, underscore the need for vigilant monitoring across cereal crops.
Source:
Teagasc Agricultural News
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⏱️ 2 min read
Two comprehensive studies conducted by Teagasc researchers have shown that the prevalence of the common knock down resistance (kdr) mutation in the English grain aphid (Sitobion avenae) has not risen in Irish barley fields since the 2018 ban on neonicotinoid insecticides. This pest is a significant threat to cereal production in Ireland and Europe, especially as a vector for barley yellow dwarf viruses (BYDVs), which can severely reduce crop yields if uncontrolled.
The investigations involved extensive surveillance of 155 winter barley crops from 2021 to 2023, alongside samples collected through the National Insect Suction Tower Monitoring Network between 2022 and 2024. Encouragingly, these efforts revealed no increase in pyrethroid insecticide resistance linked to the traditional kdr mutation, a positive sign for current pest management strategies.
Nevertheless, the genetic analysis uncovered two novel mutations in the aphid population: M918L, known as a 'super kdr', and L932F. These mutations are associated with enhanced resistance to pyrethroids in other aphid species and represent the first global detection of such changes in the English grain aphid. Further research is planned to determine their establishment in cereal crops and their impact on control measures. Continued surveillance and integrated pest management remain essential to safeguard cereal production, with growers encouraged to monitor developments and collaborate with experts Louise McNamara and Stephen Byrne at Teagasc for support and sample submission.
The investigations involved extensive surveillance of 155 winter barley crops from 2021 to 2023, alongside samples collected through the National Insect Suction Tower Monitoring Network between 2022 and 2024. Encouragingly, these efforts revealed no increase in pyrethroid insecticide resistance linked to the traditional kdr mutation, a positive sign for current pest management strategies.
Nevertheless, the genetic analysis uncovered two novel mutations in the aphid population: M918L, known as a 'super kdr', and L932F. These mutations are associated with enhanced resistance to pyrethroids in other aphid species and represent the first global detection of such changes in the English grain aphid. Further research is planned to determine their establishment in cereal crops and their impact on control measures. Continued surveillance and integrated pest management remain essential to safeguard cereal production, with growers encouraged to monitor developments and collaborate with experts Louise McNamara and Stephen Byrne at Teagasc for support and sample submission.
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