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Black spots on sunflowers, neem oil NOT helping.
Posted: Tue May 31, 2016 11:18 am
by Krystal
Anybody have any ideas or experience this before? I believe this is a velvet queen sunflower (if it's not, it's an appolos ring, or talk border mix of some type),these are all I started.
Re: Black spots on sunflowers, neem oil NOT helping.
Posted: Fri Jun 10, 2016 12:23 pm
by Lindsaylew82
Sounds fungal. I can't really see much from your photos, but they are generally prone to fungal infections. Baking soda and milk, neem oil, peroxide, copper fungicides. Any of those will help with prevention, but once the damage is done, the plant won't heal. The spots will persist. I'd remove what you can of the worst of the spotted leaves, and then do regular (you have to be consistent) treatments weekly to prevent.
I am getting good results with 1/4 cup neem oil extract and 1 heaping tablespoon of baking soda in 2 gallons of water weekly.
Re: Black spots on sunflowers, neem oil NOT helping.
Posted: Fri Jun 10, 2016 12:32 pm
by imafan26
Most fungicdes work better is you start them before the problem shows up. Fungicides should be preventively used whenever wet humid weather prevails.
Make sure the plants are not planted too close together and they get plenty of air circulation in full sun.
Taking off the leaves are a good idea as it will also open up the plant more.