Just ordered some neem oil. If I find out it is root aphids, I will be your guinea pig.
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Did you order it from Amazon? The garden grade neem oil is banned in Canada. The healthcare products like what I got from amazon.ca are still available and from what I can tell its the same shit as the stuff marketed for gardening. I mixed my neem oil with the optic foliar products. I have no idea if it worked either.
I ended up getting mosquito dunks from a local hydro store. You can't get the mosquito bits in Canada which is 2.85% Bti. The dunks are 10.1% Bti so they are stronger anyway. I think this is better than neem oil. I watered in the crushed dunks and their built in Bti in to my pots. Nuked that larvae. then I put a layer of sand on top of my grow medium to make sure adult flyers can't get back in to the medium to lay more eggs. Since I did all this last weekend I see no signs of bugs. I have the sticky paper and no adult flyers found anywhere on the sticky traps. And i put some potato chunks in the medium to see if larvae would go after them and there is nothing on them either. Pretty sure this eradicated the bugs.
Going forward I'm going to put something in my pots full of coco for each grow. Maybe DE. Or maybe crushed up mosquito dunks. Something that prevents any bug larvae from setting up shop in the roots and causing root rot etc.