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Continue treating root rot by disposing of the soil in the pot that the plant was in. Root rot is especially a problem for plants that are grown in containers, where moisture can accumulate and overwhelm the plant. Charles Pearson has written as a freelancer since 2009. The fungicides used on root rot need not harm the plant or contaminate the soil in the process of killing the fungus. Often, it is possible to identify which fungus is responsible either by observing the structure of the fungus in the roots using a microscope or by placing infected roots on artificial media or baits (apple, carrot, or potato pieces) and allowing the fungus to grow out where it can be detected and then identified. Learn which plants thrive in your Hardiness Zone with our new interactive map! If two different fungicides are to be applied, check the chemical labels of each, any available compatibility charts, or check with your Extension agent before mixing them together. Fungicide has been successful in some cases at killing root rot, though the fungicide is not always strong enough and sometimes will harm the plant, causing the plant to become more susceptible to root rot. However, fungicides are effective against "groups" of fungi and therefore a different chemical is not needed for each and every fungus. Plants with root rot disease sometimes mimic other plant problems like nutrient deficiency or heat and water stress. 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). 2. The dead roots do not recover. One fungicide called Phosacid kills the fungus and then breaks down into phosphorus, which is one of the top three nutrients that plants need the most. The hydrogen peroxide in your medicine cabinet can also be used as a fungicide against black root rot. Otherwise, plants later placed in the pot will also develop root rot, since the spores from the fungus are still in the pot. New roots must grow. If the damage is due to the activity of fungi, chemicals are sometimes available which can check the fungus and allow the plant to grow. Fungicide has been successful in some cases at killing root rot, though the fungicide is not always strong enough and sometimes will harm the plant, causing the plant to become more susceptible to root rot. Wash the pot thoroughly with a bleach solution. The fungicides used on root rot need not harm the plant or contaminate the soil in the process of killing the fungus. All Rights Reserved. Choose a systemic fungicide that is approved for homeowner use. Since it is phosphorus-based, it does not harm the plant. Root rot can be reversed if caught early. View our privacy policy. Check the label for the proper dose to use on repeat applications. One fungicide called Phosacid kills the fungus and then breaks down into phosphorus, which is one of the top three nutrients that plants need the most. The University of California tested a product known as Subdue on plants that were grown in soil infected with root rot fungus. Some fungus usually remains alive although its growth is greatly slowed as long as the fungicide is in high enough concentration. Get notified when we have news, courses, or events of interest to you. Roots appear dark brown or black and few or no white roots or root tips can be found when the root ball is washed free of soil. Phytotoxicity due to the mishandling of pesticides when used as soil drenches. Before using any pesticides, make sure you have on the proper safety equipment for the job to prevent chemicals from coming in contact with your eyes or skin. 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