# Amdro

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**Amdro** is a trade name for a [hydramethylnon](/source/Hydramethylnon)-based [hydrazone](/source/Hydrazone) [insecticide](/source/Insecticide), commonly used in the southern United States for [fire ant](/source/Fire_ant) control. Amdro was patented in 1978 by the [American Cyanamid](/source/American_Cyanamid) company, now [Ambrands](/source/Ambrands), and was conditionally approved for use by the [United States Environmental Protection Agency](/source/United_States_Environmental_Protection_Agency) in August, 1980.[citation needed] It is a delayed-toxicity food chain killer, in which soldier ants carry the bait into the mound and feed it to the [queen](/source/Eusociality), killing her and decimating the mound. Amdro uses a [corn](/source/Maize) grit and [soybean oil](/source/Soybean_oil) base, and must be used within three months after opening to be effective. Amdro has several drawbacks: (1) when it rains, or the bait is moisturized, Amdro loses its effectiveness entirely; (2) insecticide baits tend to be slow working, and take up to a month to be effective; and (3) Amdro cannot be used on food crops.

## External links

- [Chemical Fact Sheet](http://extoxnet.orst.edu/pips/hydramet.htm)

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