Using Cornstarch to Kill Roaches?

May 9, 2005

A bowl of cornstarch.I was told that cornstarch was an easy way to help get rid of roaches. Is that true? If so, does anyone have any directions for it? A friend of mine and her husband really need the help. My friend is allergic to all forms of bug sprays and bombs. Please help if you can. Thanks.


Dawn from Iowa


By (Guest Post)
February 29, 20080 found this helpful
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Boric Acid works because roaches are cannibals and when the roach eats it, it gets sick , goes to the hive and other roaches eat the sick one. This works to not just move the roaches to another residence.

I've lived in Houston for years and the ONLY thing to effectively control roaches, both German and the big waterbug types is a boric acid attack. The BEST brand to find is Eckols Roach Tablets from St. Louis.

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September 4, 2017

Can cornstarch kill roaches?


Diamond Post Medal for All Time! 1,298 Posts
September 4, 20170 found this helpful
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I don't have any roach problems, but with Google - I was able to find that you'll need equal parts of cornstarch and plaster of Paris and it'll get rid of your roach problems.



There is also a thread on ThriftyFun. Some said Boric Acid works. You can read peoples feedback here:

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Diamond Post Medal for All Time! 1,246 Posts
September 6, 20170 found this helpful
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If mixed with Plaster or Paris, yes (also found in my search). I use boric acid that I get from the 99c store. I'd deep clean the entire area then sprinkle some down. If you start with the a dirtyish base, they will return.

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