Same pest mutation gives different resistance depending on the mite's genes
Tosun HŞ, De Rouck S, Vandenhole M, Ahmed FS, İnak E
Crispr
If you've sprayed a houseplant or greenhouse tomato for spider mites and watched the infestation bounce back anyway, this research explains why some populations shrug off treatments that used to work fine.
Two-spotted spider mites are a major houseplant and greenhouse pest, and a newer group of pesticides called METI-II acaricides has been one of the few reliable ways to control them. Researchers found two different single-letter changes in a mite gene that can cause resistance, but using precise gene-editing they showed the same mutation doesn't always cause the same amount of resistance: it depends on what other genes the mite already carries, plus extra detox mechanisms working alongside it. In practice, that means resistance in the field is messier and harder to predict than a single 'resistance gene' story would suggest.
Key Findings
A new sdhB mutation (S212N) was discovered in a highly resistant Turkish field strain of two-spotted spider mite, and CRISPR gene editing confirmed it directly causes resistance.
A related mutation, S212I, conferred very strong resistance (resistance ratios over 200) to all tested METI-II acaricides, while S212N caused only weak, compound-specific resistance.
Removing the S212N mutation from the resistant field strain lowered resistance but didn't eliminate it, revealing that overactive detoxification genes work alongside the mutation to boost resistance.
chevron_right Technical Summary
Scientists pinpointed the exact genetic mutations that let two-spotted spider mites shrug off a newer class of miticides, and found that a mite's broader genetic makeup changes how much protection those mutations actually provide.
Abstract Preview
Original paper
Genetic background determines phenotypic strength of METI-II resistance conferred by sdhB S212 mutations in Tetranychus urticae.
Complex II inhibitors (METI-II) are important acaricides for controlling the two-spotted spider mite, Tetranychus urticae, but resistance to this relatively new mode of action is rapidly emerging. ...
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