I finally did what I probably should have done in the first place and contacted Gowan about the sticking and staying issues of Imidan I mentioned previously.
The Co. rep said that once Imidan drys it aint goin nowhere whatever the precip so forget the adjuvents. As I already assumed, one hour dry time is needed for it to set. The main question I was asking was how much rain would eliminate a spray if it came before the Imidan set. He suggested it would probably take at least a half inch to wash it off the trees.
[NAFEX] Imidan, spreader stickers, etc,
Alan Haigh, 05/27/2008