Pond Boss Forums INTRO Questions & Observations Why hasn't the Whitecap killed the Naiad?

It has been 6 1/2 weeks since I applied Whitecap to a pond infested top to bottom with Southern Naiad. I mixed 24 oz with approx. 15 gallons of water in a tank sprayer. I ran the boat in zig-zag and criss-cross patterns over the .85 acre pond. Average depth is 3-4�. I pushed the spray wand deep and extracted as I sprayed in what must have been 100 locations over the entire pond. Is it possible that adult Naiad plants have a tollerance to floridone? Have I not been patient enough? Anybody have an idea of where I might have gone wrong? Rapid dilution is definitely not the issue. Pond is low and there has been no measurable rain since the application.