To late for neem oil?

outdoor plants havent started flowering yet but I think I'm getting close within a couple weeks
I have zero bugs as I sprayed my yard (not plants) I know you shouldn't use Neem oil while flowering but I read it stays in the plant if you use it during veg.

My concern is white powdery mildew, fungus ETC when they are budding. I'm trying to be proactive at this point. I haven't used anything on them yet. Plants are big, more like small trees and I don't want to loose the buds due to fungus

Any advise? Or other products to use now or during flowering

If the buds haven't formed you can do a foliar application of 1tbsp neem oil to 1 litre of warm water in a spray bottle. Mist the leaves and stems lightly.
Why are you paranoid about WPM? Do you have adequate sun and air movement?

Dabbie McDoob said:

If the buds haven't formed you can do a foliar application of 1tbsp neem oil to 1 litre of warm water in a spray bottle. Mist the leaves and stems lightly.
Why are you paranoid about WPM? Do you have adequate sun and air movement?

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Yes on both. I'm just paranoid LOL. First outdoor grow and they're doing great. I dont want to loose them if I get a cool wet fall and thought being proactive at this point can't hurt.

How often does it get applied and is it true it stays in the plant during flower to help ward off WPM? Otherwise I dont need it as I have no bugs

@father nature typically, I apply it every few weeks. I have used it in the past against all sorts of stuff, i.e. fungus gnats, spider mites, cucumber beetles.
With outdoor crops I find WPM is almost always poor airflow around/through the plant and weird humidity caused by weather conditions.
Typically happens late in the fall as buds become dense.

Just enjoy your first grow. Remember, it's a plant and living organism. No matter what you do something will always be awry, thus be happy and enjoy.
I hope you don't get WPM and its a successful harvest!

Hope this helps