Daylily pests and diseases: how to recognise them

At a glance

How to grow daylily · All pests and diseases

Pests

• Leaf MinerHeavily mined leaves dry up or drop early; badly affected tomato plants can lose most of their leaves.Photo: Flowersabc, CC BY-SA 2.0, Wikimedia Commons
• Two-spotted spider miteLeaves turn yellow or reddish, dry up and drop; badly attacked plants weaken and may die. Worst in hot, dry, dusty conditions.Also called: red spider mitePhoto: Gilles San Martin from Namur, Belgium, CC BY-SA 2.0, Wikimedia Commons

Diseases

• Bacterial soft rotPotato stems may turn black and rot from the base upwards (blackleg).Photo: Scot Nelson, CC0, Wikimedia Commons
• RustHeavy infection weakens the plant; a few rusts, such as antirrhinum rust, can kill it.Photo: Rasbak, CC BY-SA 3.0, Wikimedia Commons

Which daylily problems need quick action?

These spread or do lasting harm fast; check the plants and start treatment the day you see them.

• Bacterial soft rot: Small water-soaked spots that quickly enlarge, sink and turn soft and mushy; the tissue underneath is cream to black.

Plants with many of the same problems

• Chrysanthemum (3)
• Cucumber (3)
• Green Beans (3)
• Tomato (3)
• Beet (2)
• Broccoli (2)
• Cabbage (2)
• Carrot (2)

Which plants each problem affects: sources

The links between these problems and the plant were checked against these pages.

1. hgic.clemson.edu/factsheet/daylily-diseases-insect-pests/