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While no one is complaining about the recent wet spells, we are seeing an influx of plant diseases that are a direct result of the welcomed moisture. Fortunately, most of what we’re seeing is primarily cosmetic in nature. Some of the plants experiencing diseases include sycamore, ash, maple, oak and crabapple. The diseases are caused by fungi, and primarily affect the foliage.
As a general rule of thumb, we see more plant diseases when we have rainy spells during April and May, as the new growth emerges. The amount of rain we receive is not the most critical factor. Of greater importance is the amount of time foliage remains wet.
Most of our fungi that attack plants require moisture on leaf surfaces for infection to occur. A quarter inch of rain spread over two or three days of clouds and mist is more likely to trigger an infection period than an inch of rain that falls in thirty minutes, but is followed by clear skies and drying sunshine.
Anthracnose is a group of fungal diseases that affects a variety of plants. Typical symptoms include large leaf spots that follow the veins of the leaf. Leaves may drop from the trees. Sycamores are quite susceptible, and often defoliate during a wet spring. This is a primary reason that sycamores are not a major landscape tree in the nursery industry.
Once the weather warms up for good in June, they will put out some new foliage. The London Planetree, which is a cross of the American and Oriental Planetrees, is resis
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