> I suspect they think the low amount of
> pesticide still in the plant,  will not be enough  as pest build up
> tolerance.

Here's a good link to this:
http://www.ncbi.nlm.nih.gov/m/pubmed/20737790/

> Using it as a late season foliar, will increase sales that's for sure.  

Increasing sales is indeed motivational for the registrants. Click through these maps to get an idea of just how much product has been used these past couple of decades. 

http://water.usgs.gov/nawqa/pnsp/usage/maps/show_map.php?year=1993&map=IMIDACLOPRID&hilo=L

This site allows you to select any given pesticide to follow "growth" in this industry. 

Todd A. Bebb 
SBBA.org

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