Avoiding leaf burn when using Neem Oil?

SonorityJune 22, 2011

I sprayed my violets with Neem Oil last evening; I'm trying to keep down an infection of powdery mildew and thrips.

This morning they have blackened burned edges; not so bad that it will kill the plants, but enough to make them unattractive, esp. if I need to repeat the spraying.

I used a premixed Neem Spray (packaged as Garden Safes Fungicide 3), as no where local had the concentrate. I kept the lights off afterwards and I blotted up any excess that pooled on the leaves.

I still got burned edges on the plants I sprayed.

Is there a way to avoid this? Is the prepackaged spray simply too strong for them? It is a 0.9% solution.

Unless my math is incorrect (which is possible I have a wicked sinus cold right now), 1 TBL of Neem per Gallon, which is what I've seen recommended for violets is about a 0.4% solution. It's a little higher in the premixed spray, but not overwhelmingly so.


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Hi Sonority.

Since no one else is jummping in i will give my experience. I use neem oil but not regularly. I always put my plants on an old shower curtain and spray them down thoughouly. I use this opportunity to clean my shelves. What I use is called 100% neem oil and I use it stronger than what is called for.

I treat them afterwards like you do , sponge the centers off with paper toweling and keep them out of the light until the next day.

Anyway my plants seem to love the Neem, they look so vibrant and healthy afterwards. I really don't think the neem I have been using would cause the problems you are describing.

I always take the excess and spay all of my plants inside and out. They love it.

Thom in Indy

    Bookmark   June 23, 2011 at 2:03AM
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Thanks for the response. The only thing I can think is that maybe there is something not listed on the label in the premixed spray. I'll have to order the 100% concentrate.

Here is a link that might be useful:

    Bookmark   June 23, 2011 at 10:00AM
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I only use the concentrated oil, also. If I understand it correctly, not all Neem is processed the same, nor does it contain the same active ingredients. Cold processed - such as Dyna Grow's version - is considered the best as it contains azadirachtin - which they think is one of the more important components of Neem.

I accidentally bought the Green Light version before I learned about this. Then I bought the Dyna Grow. Because I didn't want to waste the Green Light version, though, I decided to mix them together. I use 1/2 t per 12 ounces of water (quarter t each). I spray once a week, at night, after the lights are off. I put them back on the shelves without wiping up anything.

I've not every had anything burn or be harmed. On another forum, just last week, we were talking about this. Some people have had the damage you've had, others have damage only to blooms, but not leaves. Then, others like me have had no damage at all.

    Bookmark   July 9, 2011 at 2:28PM
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Thanks for the post, Sweet Pea.

I purchased the Dynagro version after my initial post, but have not used it yet. The other garden safe one, I've been using on my roses and peonies outside to keep the powdery mildew devil back.

Hopefully it was just something in the Garden Safe version, an additive perhaps, that was causing the damage. I guess I'll know soon enough. :)

    Bookmark   July 9, 2011 at 3:30PM
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