Disease of citrus.
Citrus plants can be affected by many diseases, pathogens which are tiny organisms: fungi, bacteria, viruses and mycoplasmas. Under their influence on the plants appear a variety of defects (spot, rot, ulcers, warts, withering, izrastaniya, et al.). Malicious plant organisms are spread by insects, wind, dripping water when watering and spraying; may occur due to mechanical damage to plants, to penetrate through the stomata of the sheet.
Symptoms of infection of plants by fungi and bacteria are very similar, but the fungal infection with sprawling stains on them are often visible fungal spores as a gray plaque, black spots or brown pustules sporulation. Affected by viruses and mycoplasmas plants also have similar symptoms: dwarfing, mosaic pattern on the leaves, the greening of flowers, stems paniculata (from one node grows many small shoots), change in the shape of leaves, shoots, flowers and others.
Pinpoint pathogens can only be through laboratory research. If a plant disease caused by microscopic fungi and bacteria can be treated with fungicides, the disease caused by viruses and mycoplasmas, cure is not possible - have to destroy diseased plant.
Since the disease is most often appear on the weakened plants, it is important to properly care for citrus, to deal with pests, immediately cut found sick and damaged parts of plants, disinfecting and prisypaya slices activated carbon. With a sick plant is better to remove the buds, flowers and fruits that they do not weaken it, for a more rapid immune reconstitution and recovery.
One of the means of prevention and treatment of various fungal diseases is two-three-fold spraying citrus 1% solution of liquid Bordeaux. For the prevention and suppression of many agents of fungal and bacterial diseases of citrus, as well as other indoor plants, it is recommended Chemical fertilizers "fitosporin" (non-phytotoxic) added to irrigation water according to the instructions.
The most common and very dangerous for the citrus is a pathogenic fungus that causes anthracnose disease - it affects and branches and leaves, and fruit. Anthracnose causes bud drop plants; leaves turn yellow and fall off, too; on the fruits appear reddish spots; branches die. Measures against anthracnose: must be cut dead shoots and hold the above-described treatment; in the future to comply with the rules of care for citrus plants.
Blisters citrus - this disease is also caused by pathogenic fungi on young shoots, leaves, citrus fruits. On young leaves first appear small transparent yellow spots, and then these spots turn into warts pinkish-gray color.
Appearing on the young shoots of the warts gradually expand, forming a big build-up, and can cause death to escape. On citrus fruits appear orange spots that increase in size and painted in reddish-brown color; ovaries fall. The development of this disease is favored by high temperature in the room and high humidity.
Measures to combat warty pruning and burning of the affected parts of the plant. Crown citrus sprayed 1% solution of liquid Bordeaux. The first spraying is carried out in March, and the second - after flowering (in June), the third spraying - in July. Citrus blight, or kamedetechenie manifested in the form of longitudinal brown-red spots on the trunk and branches of citrus plants. Bark in these places gradually dies, and from the cracks in the air follows catatonic kleykovataya yellowish-golden liquid - gum.
The causes of this disease may be several:
- Too deep planting (seedlings of citrus can not bury Transfer); disinfect the soil before planting the 1% formalin solution);
- Lack of drainage (with the appearance of the disease should stop watering for 2-3 days, and in the future with a lot of citrus to water restriction);
- Excess nitrogen with a lack of phosphorus and potassium (not water the plant slurry and reduce the dose of nitrogen);
- Mechanical damage.
Measures against bacterial blight, first remove the cause of the disease.
Gently smooth out the wound, disinfect its 3% solution of copper sulfate (in 1 liter of water was dissolved 30 g of copper sulfate and 100 g of quicklime or hydrated lime 200 g) and obscure garden pitch wound. Debridement is repeated several times until complete healing. If the plant fails to heal, it is burned.