Damping Off of Vegetables
Pest Management Fact Sheet #5063
Authors: Dr. Alicyn Smart and Nathan Andrews
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Pathogen: Many fungal genera including Alternaria, Botrytis, Fusarium, and Rhizoctonia as well as Protist genera Pythium and Phytopthera
Damping-off is a common but highly damaging plant disease that affects seedlings at the beginning of the plant’s life cycle. This soil-borne disease infects young or germinating seedlings during unfavorable growing conditions. In Maine, this usually will be caused by cool, wet conditions both above and below the soil line. In these conditions, spores will quickly cause seedlings to rot, collapse, and die. Within days of germination, seed beds can lose hundreds or thousands of seedlings to this disease.
- all vegetable seedlings
Symptoms and Signs
Damping off will occur very rapidly. Seeds and germinated plants may be rotted quickly and fail to emerge above ground. Emerged seedlings will begin to rot or brown on the stem or at or below the soil line, causing the plant to topple over and die. Wet lesions may be found on the stems or crowns of these plants. Depending on the pathogenic fungi causing the disease, a foliar blight may appear on the cotelydons or the true leaves.
- When seeding, do not stack trays after filled with soil. This can cause compaction of the soil and add stress to the plant when germinating.
- Sterilize any reused materials like seedling trays by removing all the soil from the tray and submerging it in a 10% bleach solution
- Add biological organisms to the soil when seeding. Examples of products are listed below.
- Plant seedlings in warm soil and dry conditions.
- Supply bottom heat to trays to increase soil temperature
- Plant seeds shallowly in soil or seed trays
- Use proper spacing of seedlings recommended during planting.
- Avoid overwatering.
- Avoid using fungicides if possible due to seedlings being sensitive to phytotoxicity, which may occur when pesticides are applied.
|Active Ingredient||Application||Trade Name|
|Bacillus subtilis v. amyloliquefaciens||2.6 to 5.2 oz/A||Taegro ECOOG|
|Coniothyrium minitans||0.75 to 1.5 oz per 1000 ft2||Contans WGOG|
|cyazofamid*||3 fl oz/100-gal water||Ranman|
|mancozeb||8 oz/100 lb. seed||Dithane M45|
|propamocarb HCl*||See label for rates||Previcur Flex|
|Streptomyces griseoviridis||1 to 2 g/cubic yd||MycoStopOG|
|Trichoderma asperellum, T. gamsii||See label for rates||BiotenOG|
|Trichoderma species||See label for rates||RootShieldOG, Rootshield PlusOG|
*For Pythium and Phytopthera ONLY
You should check your local town ordinance for any pesticide restrictions before application.
Meadows, Inga, Sharpe, Suzette, and Michelle Henson (2017, December 6). Damping off in Flower and Vegetable Seedlings. Retrieved from North Carolina State University – Extension: https://content.ces.ncsu.edu/damping-off-in-flower-and-vegetable-seedlings
Seebold, Kenneth W., and Nicole A. Ward (2012, February). Damping-off
of Vegetables and Herbaceous Ornamentals. Retrieved from University of Kentucky – Cooperative Extension: https://plantpathology.ca.uky.edu/files/ppfs-gen-03.pdf
Moorman, Gary W (2011, April 27). Damping Off. Retrieved from Pennsylvania State University – Extension: https://extension.psu.edu/damping-off
Johnson, Michael, and Claudia Nischwitz (2014, October). Damping-off. Retrieved from Utah State University – Extension: https://utahpests.usu.edu/uppdl/files-ou/factsheet/PLP-021.pdf
Multiple Authors. Disease Control: Tomato, Greenhouse, and High Tunnel. Retrieved from New England Vegetable Management Guide: https://nevegetable.org/crops/disease-control-24
Wick, Robert L. (2013, December). Damping-Off of Bedding Plants and Vegetables. Retrieved from the University of Massachusetts, Amherst – Extension: https://ag.umass.edu/greenhouse-floriculture/fact-sheets/damping-off-of-bedding-plants-vegetables
WHEN USING PESTICIDES, ALWAYS FOLLOW LABEL DIRECTIONS!
Alicyn Smart, DPM
Plant Pathologist and Director of the Plant Disease Diagnostic Laboratory
University of Maine Cooperative Extension
Information in this publication is provided purely for educational purposes. No responsibility is assumed for any problems associated with the use of products or services mentioned. No endorsement of products or companies is intended, nor is criticism of unnamed products or companies implied.
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