# Penta Plant Diseases
-
Pythium Root Rot
-
Pythium root rot is a fungal disease with symptoms including soft, brown or mushy roots, and can also attack stems. Root rot almost always occurs when the flower is planted in poorly aerated or poorly drained soil. Rot will begin in the smaller roots and move inward. Since the diseased roots don't absorb as much water, the top part of the plant may look wilted and lower leaves may become yellow. This may cause people to water the plant more, which exacerbates the problem. This root rot can be controlled with a fungicide specifically labeled for pythium.
Botrytis Blight
-
There are many species of botrytis, a fungal disease, and each one has a unique variety of symptoms. However, the botrytis that forms on pentas usually attacks tender tissues such as flowers, fruits, new foliage and seedlings. Additionally, it can be very opportunistic and frequently enter the plant through a wound. On stems, it can form necrotic cankers that may eventually girdle stems and kill the part of the plant cut off from water and nutrients. Treatments include increased air circulation and a fungicide labeled for botrytis.
Iron Toxicity
-
Penta plants enjoy higher pH levels, so if the pH falls below 6.2, burns may appear on the margins of the leaves. Sometimes, brown or tan areas also appear. The solution is to raise the pH levels through a lime application. Either surround the drip line of the plant with powdered lime and water or mix lime with water and drench the soil around the plant. Apply the formulation until the pH is at least 7.0.
Powdery Mildew
-
Powdery mildew forms in moist growing environments with poor circulation. It looks like a white powder on the surface of the leaves. If left without treatment, the mildew will slowly spread until the plant looks dusty and the leaves will wilt and fall off. Without treatment, the plant will likely die. However, powdery mildew is relatively easy to treat without the need for harsh chemicals. Usually a mix of water, baking soda and soap will do the trick.
-
