This disease is a problem on pansies during the late summer months when temperatures are high. It is also important to raise flat planting areas so that the water will drain off rapidly and not saturates soils.īlack Root: Black Root is the fungal disease that usually starts at root tips and through root hair.

Allow the top 1/2 to 1 inch of soil to dry out before next watering.Improve soil drainage – the disease is associated with heavy clay soils.do not pull out Pansies and plant Petunias or Snapdragons, but use plants like Marigolds, Zinnia, Poppies, Calendula, etc. Crop rotation is recommended for the management of Phytophthora, but do not alternate planting with the above plants, e.g.The crown base or lower stem of infected plants normally rot at or near soil line, as the disease progress the entire plant usually turn yellow or wilting followed by complete death of the plants. The plants that are more vulnerable to this disease are Pansies, Petunias, Snapdragons and Violas. Root and Crown Rot: The problem is most often detected in flowerbeds that have been planted with same species year after year.

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