I mix it at 1.5oz to 1 gallon like it calls for and it takes forever for crap to even look sick. Sprayed a bunch of junk here at my parents last friday in 100 degree heat. Been at or near 100 every day and here we are 4 days later and stuff is just now starting to look a little sick. I am half way through this large jug and I have yet to see it have a quick knock down like they claim. My friend works for the parks (darn gvt employee) and he sprays a lot of this stuff and he said as long as it is hot out he can spray in the morning and come back around 2pm and everything is all hung over and turning yellow. He said they mix it hotter than the instructions call for. Do I have a bad batch or is it really not all it is cracked up to be?