Euonymus Diseases
Gary W. Moorman, Professor of Plant Pathology
| Disease | Symptoms | Pathogen/Cause | Management |
|---|---|---|---|
| Anthracnose | Small spots pepper leaves of evergreen euonymus. An orange-brown, slightly raised stem canker may develop and cause branch dieback. | Glomerella cingulata (asexual stage is Colletotrichum gloeosporiodes) | Avoid overhead watering in the nursery and landscape. Inspect containerized plants and do not use those already infected. Apply chlorothalonil, cupric hydroxide, mancozeb, or thiophanate methyl + mancozeb or azoxystrobin to protect healthy leaves. |
| Crown gall | Galls 1/4 inch to several inches in diameter form on stems or roots. These are white at first and firm like cauliflower but become hard and dark brown with age. | Agrobacterium tumefaciens carrying a gall-causing plasmid | Purchase gall-free plants. Never plant galled material. Plants not severely affected should be cared for well so that they are not under other stresses. Severely affected plants should be removed. Do not replace the plant with gall-susceptible woody or herbaceous plants. Dip cuttings in Agrobacterium radiobacter. |
Crown gall.
Anthracnose.
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 | Chloronitrile | chlorothalonil | 48 | Daconil (50534-9) |
| 12 | Echo (60063-7), PathGuard (60063-7-499), Concorde (72167-24-1812), Pegasus (72167-24-1812) | ||||
| Copper, fixed | copper hydroxide | 48 | Kocide (352-656), Champion (55146-1) | ||
| Dithiocarbamate | mancozeb | 24 | Dithane (707-180), FORE (707-87), Junction (1812-360), Pentathlon (1818-251) | ||
| Combined products | 1 | ||||
| 1 + M | thiophanate methyl + mancozeb | Zyban (58185-31) |
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).
| Biological control agent (type of organism) | Trade Name (EPA Reg. no) |
|---|---|
| Agrobacterium radiobacter (bacterium) | Galltrol A (strain 84) (40230-1) Norbac 84C (strain K84) (38087-2) |
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.
Issued in furtherance of Cooperative Extension work, Acts of Congress, May 8 and June 30, 1914, in cooperation with the U. S. Department of Penn State College of Agricultural Sciences research and extension programs are funded in part by Pennsylvania counties, the Commonwealth of Pennsylvania, and the U.S. Department of Agriculture.
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