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Symptoms, Identification, and Control Methods of Root Rot in Dianthus

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Identification points: Dianthus root rot mainly affects the root system. After the plant is infected, its growth becomes weak, there are very few fibrous roots on the diseased plant, and the leaves wilt. In severe cases, the root system turns entirely brown, rots, and the root cortex peels off easily, and the whole plant withers. Occurrence characteristics: The pathogen belongs to the Pythium group. This fungus survives on plant residues in the soil and is an important soil-borne fungus that can harm many kinds of plants, causing Pythium root rot. The disease is severe when the soil or growing medium is slightly alkaline and humidity is high. Under conditions such as being placed too densely, excessive watering, and poor ventilation, it is also prone to

Identification points: Dianthus root rot mainly affects the root system. After the plant is infected, its growth becomes weak, there are very few fibrous roots on the diseased plant, and the leaves wilt. In severe cases, the root system turns entirely brown, rots, and the root cortex peels off easily, and the whole plant withers.

Occurrence characteristics: The pathogen belongs to the Pythium group. This fungus survives on plant residues in the soil and is an important soil-borne fungus that can harm many kinds of plants, causing Pythium root rot. The disease is severe when the soil or growing medium is slightly alkaline and humidity is high. Under conditions such as being placed too densely, excessive watering, and poor ventilation, it is also prone to occur.

Control methods: (1) Pay attention to improving the soil or potting medium by adjusting it to be slightly acidic; if the water used for watering flowers is alkaline, ferrous sulfate can be used to adjust it to slightly acidic, and attention should be paid to controlling soil moisture. (2) Promptly clear away diseased plants and destroy them in a centralized manner to reduce sources of infection. (3) When the disease begins to occur in the field, use a 70% quintozene powder 800-1000 times solution to drench the roots several times, with an interval of 7 days each time.

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