Long lasting insecticide?

If you're physically blocking the holes, why do you need insecticide?

Cracks and voids.

How about filling the cracks and voids?

Of course. Easier said than done. Getting to the backside of pipes and into very small cracks is time consuming. Do you know of an insecticide that will last forever? Liquid is best. Thanks.

One reason many insecticides are banned is BECAUSE they last forever - they don't break down into simpler elements over time. That's why you DON'T want to use them.

Question: When these chemicals leach into the ground, where do you suppose they sometimes end up?

DDT.

Now available from your local World Health Organization office.

Not sure what those two have in common but no, there is no permanent pesticide.

Bob S.

Rob

In article , snipped-for-privacy@alum.mit.edu says... :) I have some crumbled spots in the concrete slab under my house. These :) are at the edges where "tackless" strips used to be anchored. I'm :) installing a floating floor now and want to patch the slab and prevent :) insects from crawling in. Can anyone suggest a "permanent" :) insecticide? In the old days we would have used chlordane but that has :) been outlawed and is unavailable now. :)

Well the closest thing you will come to be permanent would be the inorganics such as boric acid, silica gel, diatomaceous earth, but even with those over time they will be covered with dust/and dirt and become less effective. Placing them around the interior side of the foundation may give you some aid.

The closest thing to a long lasting insecticide will be filling the cracks and voids.