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The herbicide 2,4-D mimics the plant hormone auxin and sets off a complex series of events - involving two other plant hormones - that eventually lead to the death of susceptible plants.

Grasses are much less sensitive to synthetic auxin herbicides than are dicots. That is, a much higher threshold level of auxin-based herbicide is required to elicit physiological responses in grasses versus the so-called "broadleaf" plants. So, at the doses used to kill daisies, for example, grasses are largely unaffected.

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9y ago
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9y ago

The herbicide 2,4-D mimics the plant hormone auxin and sets off a complex series of events – involving two other plant hormones – that eventually lead to the death of susceptible plants. Grasses are much less sensitive to synthetic auxin herbicides than are dicots.

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Q: What hormone kills daisies but not grass and why?
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