Brown spots on Mint after spraying with Neem Oil

[mintjp]

Hello, this forum is great by the way !

I was wondering if an expert here could have a look at my discolored Mint leaves
[img]https://lh3.ggpht.com/mint.jp/SNYNa4MdVXI/AAAAAAAAACc/a9GXKjnTtwk/s144/Mint%20Return%5BHerb%20and%20Rose%5D_20080911_999_2.JPG[/img]
[url]https://2.bp.blogspot.com/_C1xvTWVts0w/SNeFpuSangI/AAAAAAAAAGA/wdhWfQ9bboE/s1600-h/Mint+Brown+Spots_20080911_999_2.JPG[/url]

This is growing in a pot outside on my balcony (I live in a flat), and as a preventative measure I sprayed it with Neem Oil.
It looked fine before the spraying, so I am wondering if maybe it was the Neem Oil that did this

Any help would be greatly appreciated !

Thank you

[emerald7]

I have similar spots on my mint. I didn't spray with neem oil, but there was neem oil in the watering solution. Hm....

[rainbowgardener]

Mint is very tough and is insect repellant. I would not bother spraying it with anything preventatively. Mint oil is used to keep insects away from other plants!

[emerald7]

I am thinking, if the spots might be due to too much fertilizer.

Here is the history:
3/4:
When I planted the mint, I mixed some powdered fertilizer in the soil in the ratio stated on the fertilizer package. (5 nitrogen 5 phosph. 5 potash) The package said that the fertilizer can be used every 30 days. But I decided to go 2 mos before fertilizing again.

4/30 & 5/15: I gave the plant some liquid fertilizer that contains nitrogen & potash. This fertilizer says it can be used every 2 weeks. And I did use the ratio as listed on the bottle.

Neem oil/soap flush: The last time I flushed the mints with neem oil was 4/19. So that was a whole month ago.

Watering: I'm watering with the cinnamon & chamomile mixture (2 chamomile tea bags + 1 cinnamon stick per 1 gallon of water) on a regular basis.

It seems like to me that I didn't have any spots until I put that liquid fertilizer. I've been using the liquid fertilizer on the other plants with no problems, but I am thinking it might be the fertilizer...

I think I will go completely off fertilizer for a month and see what happens. Any thoughts?

(Also, I still have a few fungus gnats but they are much reduced from before.)