Quote:
(hope I'm not asking too many, just want to get things right and keep these horrible creatures away, house centipedes are terrible but I can handle them, these Am.cockroaches are a whole different thing for me to handle)
Thank you for asking all these questions; they have all been informed, literate, and exemplify why I do this.
Yes, most of the pyrethroid suspensions will last through several rains. (Aside, I'm in Carolina; hurricanes degrade them a LOT faster).
Quote:
even though I sprayed Conquer every 2 weeks I STILL SAW about 1 Am.Roach per week during the summer
Now that I have done my best to cast doubt on your supplier, if you continue to see insects after treating every 2 weeks, maybe his advice about changing products has some merit. I would recommend something in a suspension rather than the emulsion they have been selling you. That website I linked to has a couple of products like that but you have to mix them yourself. Search for "Talstar" and look at the pages of similar products.
Quote:
Also what will the soil-dissolving granules do and what are some you would recommend?
The soil treatment will act as a long term repellant and last longer than a surface application. Ortho and Spectracide labels have decent granular products of both Bifenthrin and Fipronil insecticides.
Quote:
Why is it important to extend the spraying 3 feet up the foundation walls?
That will extend the repellency zone and get repellants into most of the entry points roaches use such as weep holes, pipe and conduit entries, or gaps between different building materials.
Quote:
Maybe they just went away on their own, is that a possibility or does that usually not happen with American roaches?
Cooler weather tends to make them seek shelter, as they are cold-blooded. Any that have harbored around your heat ducts can start moving when you cut your heat on.
As far as Wintertime treatments, doesn't it make sense to try to prevent invasions rather than driving them out after they get in?