Rhaphiolepis umbellata, commonly known as yeddo hawthorn or Indian hawthorn, is an evergreen shrub native to Korea, Japan, and Taiwan. It grows to 4-6 feet tall and wide, with glossy oval leaves that are 2-3 inches long. The leaves are dark green on top and paler green on the bottom. They have a serrated edge and are very leathery.
Rhaphiolepis umbellata is a popular ornamental plant because of its attractive foliage and flowers. The flowers are white or pink, and they bloom in early summer. The fruits are blue-black berries that are edible, but they are not very tasty.
One of the most common problems with Rhaphiolepis umbellata is leaf spot disease. This disease is caused by a fungus called Entomosporium mespili. The fungus produces small, reddish-purple spots on the leaves. As the disease progresses, the spots turn light to dark gray. Older spots become darker in color with sunken centers and develop yellow halo around them. Leaves turn reddish-yellow before falling off.
There are a number of things that can be done to prevent leaf spot disease on Rhaphiolepis umbellata. These include:
- Planting the shrub in a sunny location with good air circulation.
- Watering the shrub regularly, but not too much.
- Fertilizing the shrub in the spring and fall with a balanced fertilizer.
- Pruning the shrub to remove any diseased leaves or branches.
- Applying a fungicide to the shrub in the spring and fall.
If leaf spot disease does occur, it is important to treat it promptly. The following fungicides are effective against Entomosporium mespili:
- Chlorothalonil
- Mancozeb
- Propiconazole
- Tebuconazole
It is important to follow the directions on the fungicide label carefully.
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