How Much Fipronil Required To Kill One Roach? - Pest Control - DIY Chatroom Home Improvement Forum

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Old 07-01-2015, 08:11 PM   #1
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how much fipronil required to kill one roach?

I bought Combat source kill max bait gel. fipronil.

I know there's a roach nest under the house, and I put lines of gel in an area where they gather every night. About 5" long.

Each night, the bait is eaten spotless!

I'm concerned that a few roaches are eating all the bait, whereas I would like more roaches to eat less and "share the wealth".

Is a rice grain size drop of gel bait enough to kill a big roach?


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Old 07-02-2015, 03:11 PM   #2
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Fipronil is highly effective on roaches, a rice grain sized drop is plenty to kill a roach, in fact enough fipronil will pass through a roach before it dies that lethal doses are left behind in their waste which is only about the size of ground pepper grain. If they're finishing off the strip you lay each night I would increase the amount you're leaving out, it'll kill roaches exposed to it within a few days but remember they've likely laid eggs which will take time to hatch, you'll have to bait and kill those so it may take a while of repeated baiting to eliminate them completely.


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