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They arise without warning and pose puzzles. If red spots spread on the leaves of the photinia, quick action is required. The right care can help.
Red spots can be an indication of disease
This can lead to red spots:
- drought stress
- Wrong care measures
- leaf tan
drought stress
When the ground freezes through in winter, the roots cannot absorb water. Plants lose moisture through evaporation. This process is enhanced by exposure to direct sunlight. As a result, there is a water deficit, which means drought stress for the plant. This is expressed by burgundy dots and spots on the leaves, which depending on the extent can be limited or spread over the entire leaf surface.
You can prevent drought stress by paying attention to the optimal location when planting the trees and shrubs. Gloss medlars prefer a growth location in areas with mild winters without long-lasting frosts. Although numerous varieties of photinia are offered as hardy, they are sensitive to permafrost. Protect the root ball with fir branches, brushwood or fleece. Before winter, water the plant thoroughly so that it can replenish its water reserves.
Wrong care measures
Glossy medlars do not need a lot of water. They only need to be watered when the top layer of soil has dried. If there are long periods of drought in summer, the need for water increases. The plant loses more water than usual due to the dry air. If it is not watered regularly, this leads to heat-related drought stress.
In summer, make sure your shrubs get enough water. The soil dries out faster because the warm air can absorb more water. As a result, the roots receive less water. A penetrating pouring remedy.
leaf tan
This fungal disease affects the leaves of weak and diseased plants. The spores settle on the leaf surface and form red or brown spots. Fungi prefer a moist environment. They spread in poorly aerated stands of plants, settle in the fallen foliage and benefit from warm and humid summer months.
Remove affected leaves and spray the entire plant with a fungicide containing copper sulfate. To strengthen the plant, regularly mix in a decoction of field horsetail into the irrigation water. When planting your garden, make sure that the shrubs are not too close together.