Hi noticed some very small yellow spots on some daylily leaves any ideas? Thanks Gary

Could be a sign of over watering if it has been going on over the past 2 weeks. Maybe reduce the water a little.

Maybe daylily rust, a photo would help.

Ok thanks I'll take one. Gary

Here is a photo of yellow spots on a daylily leaves. Gary

That for sure looks like rust!

Thanks seedfork I'll look up cause and treatment. Gary

MochaJoe said:Thanks seedfork I'll look up cause and treatment. Gary

The cause is the fungus Puccinia hemerocallidis. Assuming you are USDA Zone 6 and not 7 it is unlikely to come back next year unless you buy new plants that are infected. More info:

http://web.ncf.ca/ah748/rust.h...

Yes we are zone 5–6 here . Should I remove all infected foliage ? We are heading into October so they ( foliage ) will be drying up soon anyway.

Removing the infected foliage would be an extra layer of protection but daylily rust can't survive on dead daylily leaves in a form that can infect daylilies the following year, so if all your leaves normally die completely back in winter you should be safe in any case.

Which fungicide works well against rust on daylilies?

Ronny07 said:Which fungicide works well against rust on daylilies?

Typically the strobilurins (e.g azoxystrobin, pyraclostrobin) but they are expensive. The least expensive strobilurin has been reported to be trifloxystrobin - it can be purchased in smaller amounts but I don't know how the price compares these days. A different type of fungicide, tebuconazole, was reported to be cost effective in this study:

https://apsjournals.apsnet.org...

(Note that the above study uses the old placement of daylilies in the lily family, Liliaceae whereas they are now considered part of the Asphodelaceae family.)

But if you have a regular, frequent spray program you should always rotate and not use the same or a related fungicide every time otherwise there is the danger of the fungus becoming resistant. In other words don't rotate azoxystrobin with pyraclostrobin.

Hi sue,

Thanks for the explanation about the different types of fungicides, very professional!
I have found a product here in Belgium that contains azoxystrobin, it is Ortiva from Syngenta, I am going to use that first and alternate with another product in the future.