Fungal diseases

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Fungal diseases on garden plants are a common evil. Often you can prevent even by prevention the worst. Species-appropriate choice of location is one of the most important requirements for healthy garden plants. Healthy seeds and seedlings prevent the introduction of pathogens. Soil loosening to improve growing conditions and soil improvement with sand, bentonite or compost can increase fertility and promote soil life. The sowing or planting of garden plants at the right time, an optimal diet with organic long-term fertilizers, preventive treatments with plant strengthening agents as well as crop rotation and mixed culture also promote the natural defense mechanisms. When watering the plants, it is important not to wet the leaves, so that fungal spores can not germinate so easily. Regularly planted fruit trees and vegetable and perennials planted with sufficient distance dry quickly after rainfall.

Wrong mildew

Downy mildew infests ornamental plants, cucumbers, radishes, radishes, lettuce, peas, lettuce, cabbage, spinach, onions and grapevines. If anything, the fungal coating occurs on the underside of the leaf. On the other hand, the yellow, later brown spots on the upper side, which are usually limited by the leaf veins, are more noticeable. Ask for resistant varieties in the trade and preventively treat susceptible plants with biological preparations based on sulfur or copper.

Wrong mildew

Downy mildew is often recognized by yellow spots on the leaves


Rust mushrooms cause very noticeable symptoms. They grow in the leaves, on the undersides of the leaf mostly yellowish to reddish brown rust pustules with spores are formed for spreading. Rust mushrooms can be like the pear grid, whose main host is the sweet tree (Juniperus sabina). In addition, the Chinese juniper (Juniperus chinensis) and the virgin juniper (Juniperus virginiana) also infest. They can only be fought with fungicides or by removing the intermediate or main hosts in the area. Incidentally, because the grain rust used to cause great damage to agriculture, the culture of the intermediate host - the barberry (Berberis vulgaris) - was even banned for a long time.

Fungus disease pear grid

The pear grid is one of the most common rust fungi in the garden. It is host-changing and overwintered in various juniper species

Apple scab

Apple scabs are recognizable after flowering on green-black, later brown-black spots on the leaf tops. The foliage falls early, with affected fruit ruptures the shell. Relatively resilient are varieties such as 'Prima', 'Florina' and 'Sir Prize'. As a precaution you should mulch trees with compost, water the trees well, level them regularly and remove the fall leaves. After flowering in wet weather, preventive patches with net sulfur make sense.

Apple scab

Apple scab is caused by the human harmless fungus Venturia inaequalis

Leaf spot pathogen

Leaf spot pathogens cause stains of various kinds. These are red or white, for example, in the red or white spot disease of the strawberry, black (tar spot disease on the maple), yellow, brown or gray (Septoria leaf spot on tomatoes), large and star-shaped or tiny and small roundish. General preventive measures against fungal diseases can prevent infection. However, most leaf spot diseases are not so serious that you would need to use fungicides.

Marssonia leaf fever disease (Marssonina juglandis)

Walnut leaf infested with Marssonia leafworm disease (Marssonina juglandis)

Powdery mildew

Powdery mildew always appears as a wipeable, white, later brownish deposit on the leaf tops. The leaves are browned and dried up. It is particularly prevalent in roses and other ornamental plants, cucumbers, peas, zucchini, squash, corn salad, apples, gooseberries and black currants. They should remove diseased leaves and shoots and, in the event of an infection in the previous year, inject the plants preventively with net sulfur WG.

Powdery mildew in snake cucumbers

Powdery mildew is spotty at first, later it spreads over the whole leaf


Gray mold affects many ornamental plants such as peonies, strawberries, vines, cucumbers and lettuce. Afflicted areas rot and are covered with a greyish mold lawn. Gray mold spreads especially on weakened, over-fertilized plants or with increased humidity. You should choose a dry, airy and bright location for endangered plants and remove any diseased parts of the plant as early as possible. Sprays of homemade plant fortifiers such as horsetail make endangered plants more resistant.

wilt fungi

Withering fungi can affect almost all garden plants.They usually penetrate over damaged roots and destroy or block the vessels, so that individual shoots are cut off from the water supply and wither. A typical damage image of the so-called Verticillium wilt in woody plants is that often not the entire plant wilts, but initially only individual branches. Most plants, such as the fan maple (Acer palmatum), are susceptible to fungal disease, especially on unsuitable, very loamy and poorly-ventilated soils. They should avoid root damage and loosely soil the soil before planting if needed. Infested woody plants can sometimes be saved if they are transplanted in time to a more favorable location. Clematis hybrids that are attacked by clematis wilt usually repopulate when planted deep enough. The surface of the pot bale should be about a hand's breadth below the surface of the earth.

Clematis hybrid 'Niobe'

In particular, large-flowered varieties such as the hybrids hybrids 'Niobe' are often infested with willow fungi

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