Viruses, bacteria and fungi can cause various diseases in plants. The most common diseases are those whose pathogens have the best adaptive capacity. Every season, common diseases will vary depending on the weather. Some diseases appear in wet weather, while others appear on dry weather.
Cancer
Cancer is caused by bacteria or fungi. This disease affects the stems and branches of the plant. Because of the cancer die cambium, which is located under the bark of bushes and trees. Usually the cancer is localized by concentric rings, the disease will grow until the shoot is completely ringed, and the zone above the focus of the lesion does not wither away. Often, gardeners like these symptoms are taken for signs of completely different diseases (burn, for example), although in practice it is cancer that has hit the lower part of the plant.
Puffin
This disease causes basal or root rot and it has a very broad meaning to be separately mentioned. Apples (mushrooms of the genus Amillaria) is the most terrible fungal disease of garden plants, since it is difficult to combat with it, and it almost does not give way to complete eradication.
Downy mildew
The disease is accompanied by the appearance on the upper side of leaves of pale green or yellow spots, and on the underside of the leaf there is a bluish or whitish coating on these places. The infection has properties to grow, capturing at times the entire leaf, which leads to its death. Because of this disease, the entire plant may die.
Leaf spotting
This disease is caused by some bacteria and many fungi. The disease is accompanied by round spots of brown or gray, often with uneven edges. The leaf patch of the rhododendron promotes the development of brown or purple spots, while the first margin is usually purple. Increasing, the spots merge together, thereby forming a large area of dead tissue. In the presence of severe damage, the leaves die and crumble, which slows the growth of the plant.
Molds
Gray mold or botrytis fungus is considered the most common mold fungus. This disease affects a number of ornamental plants that grow in closed and open ground. Gray rot basically affects stems, flowers, leaves and fruits, causing the decomposition of tissues, forming a furry gray coating.
The present powdery mildew
The most recognizable disease of garden plants. The disease is characterized by the appearance on the upper side of the sheet of a powdery felt felt white, there are exceptions. This powdery mildew has a different name - spherote.
Rust
A large group of fungal diseases. Rust strikes stems and leaves, from which appear on the leaves specks of pale green or yellow. The underside of leaves is affected by formations in the form of bubbles of brown, yellowish-brown, white and orange colors. The color of the blisters depends on the type of disease. Vesicles burst and empty the spores that infect other plants.
Root rot
This is a fairly large group of diseases, which destroys the cells of plant tissues and turns it into a rotting mass. Affects the base and roots of the plant, so it is divided into basal and root rot. There are cases when it is difficult to determine the focus of the plant.
Withering
A widespread and known disease, provoked by fungi, bacteria, viruses. On plants, all act the same, first cause the wilting of stems, leaves, shoots, eventually kills the entire plant. In some cases, the wilting appears on time, there are cases that the plant completely recovers. The death of a plant is the last stage of the course of the disease.
Viruses
The virus is the concept of a wide range of diseases that affect a large number of plants. Symptoms of viral infections - stopping plant growth, deformation of buds and leaves, spotting, mosaic pattern on flowers and leaves, necrosis of tissues.