Sprays with fungicides can be effective against both bacterial and fungal leaf spot diseases if the problem continues to progress.
I noticed dead spots on my ivy leaves this summer. What is this, and what can I do to help my plants?There are two common types of leaf diseases on English ivy found in Illinois. One is caused by fungi and the other is caused by a bacterium. Both diseases can cause defoliation if severe, but your ivy does not sound like it is suffering too much at this point. Bacterial leaf spot disease begins as light green, water-soaked spots that enlarge and turn brown or brownish-black in the center.
Fungal leaf spot produces large tan to brown spots on leaves. You may see black specks and fungal fruiting bodies on the dead tissue, which gives the spots a speckled appearance. The fungal fruiting bodies show up more easily after rain. Fungal leaf spot is generally brown in the center with a dark border. Sometimes, concentric rings give the spots a target appearance with spots scattered over the leaves. This disease can also infect stems, resulting in tip dieback.
Sprays with fungicide can be effective against both bacterial and fungal leaf spot diseases if the problem continues to progress on your ivy after trying to be more careful with your cultural practices. They need to be applied on a regular schedule and reapplied after rainy periods. Look at new leaf tissue to best identify the disease you are contending with to choose the most effective control. Fungicides for bacterial leaf spot must be copper-based, or have copper in them .
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