You'll notice that's what my last post was about. No updated info. yet however. I read the bottle and there's clearly an indication about 14-28 day intervals. Krunch already indicated that he believes it's active for longer periods if I'm not mistaken. If that's not accurate, at the very least I know he stated that you should not use this during flowering at all.
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I have not used Eagle. but I have used just about all other Ag products (over 15 that I can recall) that we use for mildew on this and other crops.
From Experience I would say this. These new mildewcides are systemic and they all have an efficacy period on their labels for 14 to 28 days. This is basically a "cover your ass" disclaimer protecting the manufacturer.
My opinion and experience with these products is basically this. They are all effective under normal to light mildew pressure for 28 to 35 days. If your room is clean and you spray your plants in the veg room a day before you move them to a clean flower room with light mildew pressure, you will probably not need to re-treat during the grow of an 8 week flower strain. I have treated 5 weeks into flower with no ill effects. Just make sure you have really good air movement and ventilation so the flowers dry quickly.
Heavy mildew pressure I would stick with an application every 18 to 21 days and rotate products on each spray. But then, you may want to figure out why the mildew keeps coming back and cure that also.
You may have wanted to hear this from krunch, but here it is anyway.