Q: What can you tell me about the sad, ugly rust infecting our wonderful daylilies?

A: This summary from the American Daylily Society gives detailed information.

Note the fungicide info.: “daylily rust can be controlled under greenhouse conditions by fungicide applications,

in particular, mancozeb, chlorothalonil (click for sources), azoxystrobin and triadimefon.

Products should be rotated to reduce the risk of fungicide resistant races of the rust developing. Alternate between a systemic fungicide and a contact or protectant fungicide. Application may need to be repeated as often as every seven to fourteen days – follow product label instructions.”

Here some homeowner fungicide products:

Banner Maxx = propiconazole

Bayer Advanced Fungus Control for Lawns = triadimefon (Bayleton)

Bayer Advanced Garden Disease Control
for Roses, Flowers & Shrubs Concentrate = tebuconazole (Elite, Folicur)

Bonide Captan = captan

Bonide Fung-onil Concentrate = chlorothalonil

Bonide Fung-onil = Bayleton (2001 label)

Bonide Fung-onil Multi-Purpose Fungicide = chlorothalonil (2002 label)

Bonide Fung-onil Lawn Disease Control = Bayleton (2002 label)

Fertilome Halt Systemic Fungicide = thiophanate-methyl

Green Light Mancozeb = mancozeb

Green Light Fung-Away Fungicide = Bayleton (not labeled for lawns)

Green Light Fung-Away Systemic Spray = Bayleton (labeled for lawns)

Green Light Fung-Away II Systemic Lawn Fungicide (2 oz jar) = hiophanate-methyl (Cleary’s 3336, Topsin-M)

Green Light Fung-Away Systemic Granules = myclobutanil

Hi-Yield Copper Fungicide = copper hydroxide

Monterey Aliette = aluminum tris (O-ethyl phosphonate)

Ortho Funginex = triforine

Ortho Garden Disease Control = chlorthalonil

Ortho Rose Pride Rose & Shrub Disease Control = triforine

Scott’s Lawn Fungus Control = thiophanate-methyl

Spectracide Immunox(liquid) = myclobutanil

Spectracide Immunox(granular) = myclobutanil

Daconil = chlorothalonil