Use the most effective fungicides (those with thiophanate-methyl, polyoxin-D, triflumizole or fludioxonil) preventively.
Fungicide or Hydrogen Peroxide to Treat Root Rot
You can treat the roots with a topical fungicide, such as organic Neem oil, or a water and hydrogen peroxide solution. Mix one tablespoon of hydrogen peroxide with one cup of water and spray the roots down well.
Products containing the fungicidal active ingredient thiophanate-methyl have been the “gold standard” for prevention and control of black root rot. Since the disease frequently affects young plant material first, it is often applied as a soil drench, early in production.
Once root rot is identified, you must determine if the plant can be saved. If the entire root system has already become mushy, it is too late to save the plant. However, if some healthy, white, firm roots exist, try to bring the plant back to good health by replanting in fresh soil with good drainage.
Hydrogen peroxide can help to control fungal growth and fungal infection, such as root rot, by preventing the growth of fungi. It can also help kill fungus and bacteria on plant roots.
Another product that'll help prevent the spread of root rot is non-flavoured cinnamon. After having removed the dead roots, sprinkle a thin layer onto the healthy tissue before placing into a bed of new compost.
Hydrogen Peroxide — The application of a 3% solution of household hydrogen peroxide to your soil is effective in killing pathogens and diseases like Phytophthora. Apply a mixture of 1 part peroxide to 3 parts water and allow it to penetrate the soil before regular watering resumes.
Depending on the circumstances and severity of over-watering your roots may need more time for recovery than others! The good news is that most plants will bounce back between 7-14 days if they're given proper care (which includes rehydration).
Most root rot fungi prefer wet soil conditions and some, such as Pythium and Phytophthora, produce spores that can survive for long periods in soil.
For curative applications, first apply ethazole then follow with an application of cyazofamid, picarbutrazox, mefenoxam, or propamocarb 2 to 3 days later. To minimize the potential for foliar burn, ethazole must be watered-in immediately after application with at least 1⁄8 inch of water.
The results with copper fungicides for control of Pythium root rot have been variable, ranging from no control to good control (Tables 2 and 3). In general, the degree of root rot control achieved with soil drenches of copper fungicides is not sufficient to warrant this use under most conditions.
With three proven active ingredients – Solatenol® fungicide, azoxystrobin and propiconazole – Trivapro is the best in its class for delivering long-lasting, preventive and curative disease control and provides plant- health benefits late into the season.
It will help in disease control to alternate fungicides used with each subsequent application to prevent a buildup of resistance to a fungicide. Slightly better control may be obtained by a liquid spray fungicide application rather than by a granular application of the same fungicide active ingredient.
Trichoderma - The Most Widely Used Fungicide.
Hydrogen peroxide, well known as an ingredient in disinfectant products, is now also approved for controlling microbial pests on crops growing indoors and outdoors, and on certain crops after harvest. This active ingredient prevents and controls bacteria and fungi that cause serious plant diseases.
Baking soda has a pH of around nine, and its alkalinity will act as poison for fungi. It will eliminate it from the roots by alkalizing the soil and preventing it from developing.
When first planting or repotting houseplants and outdoor container plants, you can also mix cinnamon powder into the soil to help prevent mold and fungus from the start. In addition to helping ward of mold, the cinnamon has the added benefit of helping the roots of plants grow better as well.
Use cinnamon rooting hormone to encourage root development
Like sulphur, cinnamon is a natural fungicide that helps most plants root, while inhibiting the spores that cause rot in stem cuttings. Dip prepared plant stems in cinnamon and push them into the soil.
Apart from being more mindful of how often and how much water you give your plants and plant roots, you can also use a mixture of 3 percent hydrogen peroxide concentration mixed in 1 quart of water once a week to encourage healthy root growth in your plants' roots or treat the spread of root rot and root decay.
If you use a higher concentration of hydrogen peroxide on the foliage of the plant you run the risk of burning it. You could burn the roots, but since it's necessary to kill the root rot-causing bacteria, it's a risk worth taking.