Aphids' old pesticide defenses secretly primed them for a new one
Zeng B, Troczka BJ, Yuan J, Pym A, Hunt BJ
Pest Management
The aphids sucking sap off your roses, peppers, and potatoes are evolving resistance to pest sprays faster than expected because of defenses they picked up generations ago, which is exactly why rotating control methods in your own garden matters more than reaching for the same spray twice.
Green peach aphids are a major pest on garden vegetables and ornamentals, and farmers rely on insecticides like flonicamid to keep them in check. Researchers discovered that many aphids already had a leftover enzyme trick from resisting older pesticides, and while that trick alone barely blocked flonicamid, it dramatically boosted the effect of a brand-new mutation once aphids started encountering the new chemical. In other words, past evolutionary history quietly set the stage for these aphids to become resistant to a threat they hadn't even faced yet.
Key Findings
Widespread overexpression of P450 enzymes CYP6CY3 and CYP6CY4, already common before flonicamid was even used, gave aphids a weak but previously unnoticed tolerance to the insecticide.
A new mutation (NaamV251I) in the insecticide's molecular target emerged after flonicamid deployment and, on its own, only produced moderate resistance.
Combining the old enzyme overexpression with the new mutation produced resistance levels far higher than either mechanism alone, showing historical adaptation amplified a new one.
chevron_right Technical Summary
Scientists found that green peach aphids became resistant to a newer insecticide unusually fast because they already carried a leftover metabolic trick from resisting older pesticides, and that old trick supercharged a brand-new mutation once the new chemical arrived.
Abstract Preview
Original paper
Historical metabolic adaptation potentiates the rapid evolution of flonicamid resistance in Myzus persicae.
Rapid adaptation to novel environments is often shaped not only by newly acquired mutations but also by historical genetic backgrounds established through prior evolutionary events. However, the ex...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Gene editing removes 97% of celiac-triggering proteins from bread wheat
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Crop-improvement refers to the systematic enhancement of plant varieties through selective breeding, genetic modification, and biotechnological approaches to develop cultivars with superior agronomic, nutritional, or environmental traits. This field is essential for addressing global food security,
arrow_forward Explore topic