Monitoring of the nAChRsα6 G275A spinetoram resistance allele in Drosophila melanogaster populations from New York vineyards
BACKGROUND Spinosyns are a group of naturally occurring and semi‐synthetic insecticides with widespread utility in agriculture, including organic production systems. One example is spinetoram (Delegate), which is the only registered insecticide in New York State (for control of Drosophila melanogast...
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Veröffentlicht in: | Pest management science 2024-11, Vol.80 (11), p.5741-5745 |
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Sprache: | eng |
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Zusammenfassung: | BACKGROUND
Spinosyns are a group of naturally occurring and semi‐synthetic insecticides with widespread utility in agriculture, including organic production systems. One example is spinetoram (Delegate), which is the only registered insecticide in New York State (for control of Drosophila melanogaster in vineyards) to which vinegar flies have not yet evolved high levels of resistance. However, low levels of resistance have been found in vineyard populations of D. melanogaster, and a highly resistant strain was obtained after only five selections (in the laboratory). We identified the nAChR α6 mutation (G275A) responsible for the resistance and developed a rapid, high‐throughput assay for resistance.
RESULTS
Surveys of collections made in 2023 show low levels of the resistance allele in four populations. A correlation was observed between vineyard use of spinetoram and frequency of the resistance allele, but not between county‐wide use of spinosyns and frequency of the resistance allele.
CONCLUSIONS
One of the sites we monitored was previously surveyed in 2019 and the frequency of the resistance allele detected in 2023 had increased. Implications of these findings to resistance management of D. melanogaster are discussed. © 2024 Society of Chemical Industry.
Frequency of the nAChRα6 G275A spinosad resistance allele in Drosophila melanogaster collected from across New York. Dots show the locations of the collections and the pie charts show the frequency of the resistant and susceptible alleles. |
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ISSN: | 1526-498X 1526-4998 1526-4998 |
DOI: | 10.1002/ps.8304 |