English Ivy (Hedera) Diseases
Gary W. Moorman, Professor of Plant Pathology
| Disease | Symptoms | Pathogen/Cause | Management |
|---|---|---|---|
| Bacterial leaf spot (p. 158) | Circular, dark-brown to black spots with yellow halos develop on leaves. Leaves yellow, die, and fall. | Xanthomonas campestris pv. hederae | Purchase plants free of the disease. Discard infected plants. Water in a manner that keeps the surface of the leaves dry. Apply cupric hydroxide, potassium salts of phosphorus acid, or fosetyl-Al to protect leaves. |
| Fungal leaf spot | Large, irregularly shaped, tan to brown spots have numerous, tiny dark-brown dots (fruiting structures) within them. | Colletotrichum trichellum | Purchase plants free of the disease. Discard infected plants. Water in a manner that keeps the surface of the leaves dry. Apply azoxystrobin or copper. |
It is not unusual to have both diseases on the same plant or even on the same leaf.
Bacterial leaf spot on Hedera.
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Fungal leaf spot on Hedera. Note the small black dots (fungal fruiting structures within the spots
Active Ingredients and Trade Names of the Chemicals
| FRAC Group no. | Risk Level | Class | Active ingredient | REI Restricted Entry Interval | Trade names (EPA Reg. No.) |
|---|---|---|---|---|---|
| 11 | 3 | Strobilurin | azoxystrobin | 4 | Heritage (10182-408) |
| M | 1 | Copper, complex | copper sulfate | 12 | Camelot (1812-381), Phyton 27 (49538-3) |
| Copper, fixed | copper hydroxide | 48 | Kocide (352-656), Champion (55146-1) | ||
| U | 1 | Phosphonate | fosetyl-Al | 12 | Aliette (432-890) |
| Phosphite | phosphorus acid salts | 4 | Alude (71962-1-1001) | ||
| potassium phosphate | 4 | Vital (42519-24) |
Fungicides and Fungicide Resistance Management - Certain fungicides, usually systemic fungicides, are said to be 'at risk' to the development of resistance if they are used repeatedly. See the Risk Level in the above table (1 = low risk; 3 = high risk). The Fungicide Resistance Action Committee has developed a numbering system in which chemicals with the same FRAC Group number have the same mode of action (See http://www.frac.info/frac/index.htm ). It is recommended that chemicals at high risk be used sparingly and in rotation or mixed with chemicals with different modes of actions (different FRAC number).
DISCLAIMER
Notice: The user of this information assumes all risks for personal injury or property damage.
Warning! Pesticides are poisonous. Read and follow all directions and safety precautions on labels. Handle carefully and store in original labeled containers out of the reach of children, pets, and livestock. Dispose of empty containers right away, in a safe manner and place. Do not contaminate forage, streams or ponds.
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