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Leaf tan is relatively common in glossy medlar
Diseases on the gloss medlar
Glossy medlars are extremely robust and are hardly affected by diseases. Weakened plants have a higher risk of infection for various diseases that can be controlled by simple means.
These diseases can occur:
anthracnose
This disease is caused by a fungus whose spores spread with the wind. The fungus prefers to grow in humid and rainy weather. If a plant becomes ill, it gets blotchy discoloration on its leaves. A high humidity environment favors the spread of the pathogen. Too tight shrubs are not sufficiently ventilated, so that the fungus prefers to spread in compact hedges. An infection of other plants is possible by affected fall leaves.
Pay attention to a sufficient planting distance. Bright medlars should be poured on the stem base so that the leaves do not get wet. Strengthening the bushes with a stinging nettle makes them more resistant. Weakened individuals are more frequently colonized by the fungal spores. You can combat the tan by spraying the infected leaves with a copper sulphate agent.
Apple scab
In months with high rainfall, there is a risk that glossy medlars are attacked by apple scab. This fungal disease manifests itself in greenish spots. With a strong infestation, the patches widen, resulting in the death of cell tissue in the leaf. Rain favors a spread of the disease. A spread of the fungi takes place through a special form of spores, which are formed asexually.
Quick action is important because the fungus spreads rapidly in warm temperatures combined with high humidity. Affected leaves should be removed and burned so that the fungus can not spread further. Disposal via household waste is also possible. Then spray the wood with a fungicide based on triforin.
mildew
Humid conditions also loves downy mildew. This fungus occasionally attacks weakened glossy medlars during rainy summer months. The disease is recognizable on a white surface, which is visible both on the upper side of the leaf and on the underside. In case of heavy infestation there is a risk that the affected leaves die off
The mildew is dependent on a high humidity. Once the air dries, the fungus can not spread further. Remove infected leaves and give the plant a horsetail straw to aid vitality. To prevent a disease, you should pay attention to a sufficient distance when planting.
fire blight
Dried flowers and leaves or black discoloration indicate the fire blaze. This disease is caused by a bacterium, which passes through injured sites on the branches or through the flower in the plant organism. The disease is mainly distributed in Switzerland. Plant shipping allows infected plants to spread the bacteria.
This disease is considered reportable, even if there is only a suspicion of infection. So far there are no treatment measures. As it spreads rapidly, it should act quickly at the first signs.