Spathiphyllum Diseases
Gary W. Moorman, Professor of Plant Pathology
| Disease | Symptoms | Pathogen/Cause | Management |
|---|---|---|---|
| CYLINDROCLADIUM ROOT AND PETIOLE ROT | Lower leaves yellow and wilt. Dark brown spots with halos form on leaves. Roots decay. | Cylindrocladium spathiphylli | Purchase plants free of pathogen. Discard infected plants. Apply thiophanate methyl as a soil drench to protect plants. |
| MAGNESIUM DEFICIENCY | Plants are stunted and vigor reduced. Tissue between leaf veins yellows and may be bronzed while veins remain green. | Lack of fertilization | Apply magnesium sulfate (Epsom salts) at 1/4 lb. per 10 gallons of water. |
| MARGINAL LEAF BURN | Leaf tips and margins yellow and die. Roots darken and die. | Over-fertilization | Leach pots if no slow-release fertilizer is present. Maintain moderate levels of fertilizer. |
| VIRUS | A mild mosaic pattern of light and dark green appears on some leaves. Other leaves, while still infected, are symptomless. | Dasheen mosaic virus | Discard infected plants. Maintain good insect control in the greenhouse. |
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.) |
|---|---|---|---|---|---|
| 1 | 3 | Benzimidazole | thiophanate methyl | 12 | 3336 (1001-69), OHP 6672 (51036-329-59807), Fungo Flo (51036-329-59807), Systec 1998 (48234-12) |
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).
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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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