Why do mandarin leaves turn yellow?
If the mandarin leaves fall, curl and turn yellow, the ovary crumbles, the fruits and roots rot, the branches turn black, then the tree is affected by the disease. To save the plant, diagnostics are carried out, the causes are found and the necessary treatment measures are taken.
Mandarin leaves turn yellow
Description of the disease
To answer the question of why mandarin leaves turn yellow, curl and dry, become sticky to the touch, become covered with a fluffy white coating, under which brown lumps form, you should determine the source of the problem. The reasons for this state of the plant lie in the defeat of the pest - the mealybug.
Mealybug is a small insect that sucks out juice, penetrating into the plant. The result of his activity is white discharge similar to pieces of cotton wool. Small individuals have oval bodies 3-6 mm long. Only larvae are harmful to indoor crops, adults do not parasitize. Places of accumulation of insects: foliage, young shoots, buds, flowers, roots.
The larvae suck buds and young shoots and move quickly on the surface. The mealybug slows down the growth of the tree. Today, there are more than 1,500 insect species that live and develop in various conditions.
All parts of the tree become sticky because they become covered in the sweet syrup as the parasite lives. A black bloom appears on the sweet syrup - this is a sooty mushroom. If the disease is not identified in time, the homemade tangerine tree will shed yellowed leaves, fruits and quickly dry out.
If young shoots have time to form, then their shape will be deformed. In rare cases, the root of the tree is affected. For ornamental citrus varieties, there is a special care aimed at preventing the appearance of the pest.
If the pest has been exterminated, and you are still wondering why mandarin leaves turn yellow or why mandarin leaves fall off, then determine if the growing conditions are correct. For example, with a decrease in temperature, an increase in humidity, when using spoiled soil, the plant begins to hurt.
Chemicals
It is necessary to reanimate a houseplant that dies with the help of such means as Aktara with Confidor-maxi, Aktellik, Vertimek. Dilute any of these products in a ratio of 1 g of the drug to 1 liter of water. Pour the tangerine soil over the mixture so that it goes as deep as possible. When processing, do not overdo it with the dosage, this can lead to root rot. Repeat the procedure after a week. Do not use one drug twice, change to another.
One of the effective remedies is a solution of Karbofos in a ratio of 5-9 g per 1 liter of water. Treat 4 times in a warm season, with a break of a week.
Mechanical restoration
Spraying can solve the problem
To save a tree from death, first of all, mechanical processing of the plant is carried out.Raising the humidity and temperature in the room where the tree is grown will also help fight the pest. To increase the humidity of the air, spray the tree in the summer; in the winter, place a container of water next to the plant. A regular warm shower is considered an excellent option for preventing the appearance of an insect. Clean the wood with a damp brush, rinse with water, carefully brushing the underside of each leaf. Such care will save the plant if it is not severely affected.
Folk remedies
When treating domestic plants, they try not to use chemical agents, because there are effective options for removing pests using natural remedies.
Solutions used to combat the pest:
- If the leaves of a room tangerine turn yellow, treat them with 1 p. in 7 days with garlic or onion juice with soapy water.
- Take 1 tsp. soap, melt in hot water, add 1 liter of water and 1 tbsp. l. alcohol (2 tbsp. l. vodka). Spray the whole tangerine with a mixed solution. It is better to cover the soil in advance. After a day, rinse with warm water. Repeat after 3-4 days.
- In the fight against the worm, a solution of garlic is effective. To prepare it, you will need 25-70 g of garlic. Clean it and mash, pour 1 liter of boiling water. Let the solution stand for 6 hours. Then strain the solution and spray the tree.
- Horsetail tincture is effective in the fight against the worm. Pour a little horsetail with boiling water and leave for 2 days. Water the tree with the resulting solution.
- To revitalize the tangerine, spray the tree with an olive oil solution. Mix 1 liter of water with 2 tbsp. l. olive oils.
- Use a tincture of calendula. Moisten a brush in it, smear the affected area. Do the procedures in the evening, hide the tree from the sun for 2 days.
If you find that the tangerine sheds leaves, you quickly need to remove the tree to save neighboring indoor crops from the spread of the disease, since the pest can move on them. Inspect all nearby plants for a month every day. Treat the place where the damaged plant was located with a solution of alcohol and soap.
If the tree does not bloom, has lost all green leaves, has dried up, pistils have fallen off, a soap-kerosene emulsion, honey-soap solution, coniferous extract are also used (dissolve 2 tablespoons in 0.5 liters of warm water).
Conclusion
Knowing why mandarin leaves turn yellow and fall off, you can diagnose the problem in time. The mealybug is the most dangerous pest that affects many plants. Insects prefer young plants. Most often, in such conditions, it is the leaves of the homemade tangerine that turn yellow. Fight against pests and chemicals, and folk remedies. To keep the tangerine tree from dying, inspect it regularly.