Neem Oil application damaged my Michelia Alba new growth
I have been reading many good things about Neem oil. So I made a mix of 10ml neem, 1 liter of water and 3 ml of Dawn's dish soap. I applied this mix to all my plants very late in the evening to avoid any sun damage.
After two days, all other plants are fine, except my Michelia Alba and Magnolia champaca. The new growth on the Michelia Alba are mildly damaged. It's having morning and afternoon sun after 3pm. There are brown to black spots on the back side of the leaves. It's hard to see from the upside of the leaves. Not all new growth were damaged. Some not at all. So the damage is not even. The Magnolia Champaca took the hardest hit, maybe because it's located in the full sun. The small leaves are kind of distorted and brown/black on all edges. All small leaves were damaged.
I got my neem oil from a local garden center sold as a leaf shine. Our weather is kind of warm and humid those days.
I just finished reading a good post by Al on the house plant forum.
Is there anything wrong with my neem application?