Plant Disease Library

Learning about the major diseases that can affect your plants and how to treat those diseases can help to make your harvest healthy, fruitful and enjoyable.

Numerous strains of fungi are commonly referred to as Powdery Mildew. Since this disease removes essential nutrients from the plant, leaves may become yellow, stunted or drop off prematurely.

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Roses, especially hybrid tea roses, are highly susceptible to this infectious fungal disease. Black spots, as the name implies, will appear on the leaves, followed by a yellowing surrounding the spots.

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This isn't the same as rust on metal! Rust spores travel through the air and land on plants, spreading the fungal disease. Although plants do not die from rust, it can contribute to the plant's decline.

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Leaf Spot affects many different types of plants, but most commonly attacks trees and shrubs. In large clusters or rows, it may also be referred to as anthracnose.

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Plants affected by this fungal disease include flowering plants, ornamentals, and fruits and vegetables. Also known as gray mold, it can cause dying tissue and buds as well as fruit or bulb rot.

Images courtesy of Clemson University - USDA Cooperative Extension Slide Series, , Bugwood.org.

learn about Botrytis Blight»