Neem for daylily leaf streak?

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iowhen Iowa City, IA(Zone 5a) Aug 10, 2013

Has anyone ever treated leaf streak successfully with neem oil? I applied some earlier this week, and will probably apply once more. Not sure how long it takes to see improvement.

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Seedfork Enterprise, AL(Zone 8b) Aug 10, 2013

I was not aware neem was an option for treating leaf streak, please let us know if you have any success!

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drobarr Hummelstown, PA(Zone 6b) Aug 10, 2013

Neem oil does have some fungicidal properties but I also am not aware if it controls daylily leaf streak. I do know it controls rust on daylilies. Please do keep us informed.

I know spacing out the daylilies to allow for more air movement as well as not over watering the foliage help to reduce the disease from a cultural management perspective.

Daconil is a pretty effective fungicide sprayed at 7-10 day intervals if already disease is present. Also infected leaves can be removed.

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Seedfork Enterprise, AL(Zone 8b) Aug 11, 2013

I have not tried Neem, but I do use a mixture of Daconil and Immunox, so far I can't tell it has made any difference with rust or leaf streak. I plucked so many leaves off the Daylilies they are pathetic looking as far as the foliage is concerned and still the new leaves continue to get rust and leaf streak. I have been spraying all year, but with so much rain I can not say this is a fair trial, because often the spray does not get to stay on the foliage for long.

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iowhen Iowa City, IA(Zone 5a) Sep 02, 2013

My report three weeks out: I sprayed three times and have let them be. It's been very dry here. Most of the leaf streak is gone. Only two plants had a new streak, but look healthy. I can't really say whether the neem helped. Does leaf streak ever clear up without chemical
Intervention?

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drobarr Hummelstown, PA(Zone 6b) Sep 02, 2013

Leaf streak occurs when the environmental conditions are favorable. But once it gets started it is very difficult to manage, even with chemicals. The conditions for its growth can become unfavorable and any new growth will not have the disease. Also fungicides will usually not control the disease curatively, rather, prevent it from affecting new growth if applied consistently. This is because most fingicides are preventive in their action. So if you consistently get this disease the best plan of attack is to apply it early in the season before you see disease and then apply regularly throughout the growing season.

I'm sure the neem helped some...I guess next time leave one untreated and see if there is a difference.

John

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iowhen Iowa City, IA(Zone 5a) Sep 03, 2013

Thanks!

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