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Daylily Perennial Shrub Diseases - Symptoms & Control


Daylily Perennial Shrub Diseases:

 

Colletotrichum Leaf Spot or Leaf Scorch:

Symptoms - Leaf tissue dies in a streak along the mid-vein.

Management - Remove infected leaves. Destroy leaf debris at the end of the season. Avoid overhead irrigation.

 

Leaf Streak or Red Leaf Streak:

Symptoms -  Reddish fleck form on the leaves as the mid-vein yellows. Oval dead spots form and the leaves die prematurely. During wet conditions wet, shiny masses of white spores can be seen with a hand lens on the brown leaves.

Management -  Remove infected leaves. Destroy leaf debris at the end of the season. Avoid overhead irrigation. Cultivars vary greatly in susceptibility. Protect new leaves with thiophanate methyl.

Rhizoctonia Crown Rot:

Symptoms -   Slender, grassy foliage develops and few flower stalks form. Crowns rot and die.

Management -   Protect crowns from freezing.

 

Rust:

Symptoms -  Bright yellow spots or streaks on the upper side of the leaf have bright yellow-orange spores on the underside

Management - Remove infected leaves and immediately place them in a plastic bag for disposal. Keep the bag closed. Apply flutolanil, azoxystrobin, mancozeb, or chlorothalonil, weekly

 

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