Pingan tree, namely Cinnamomum cassia, is an evergreen plant. Ping An tree just listen to the name feel very auspicious, at home to raise a pot is also a good landscape. However, some flower friends found that the original family raised a good ping an tree litter, but can not find the reason, anxious round and round. Kiss, don't worry! The following is the reasons and solutions for the leaves of Ping'an tree sorted out by Xiaobian. I hope it can help you.
Pingan tree with withered and yellow leaves
How to do if Ping An tree leaves off
Cercospora leaf spot
Brown spot of Pingan tree mainly damages the leaves of Pingan tree. The disease usually occurs under the conditions of poor indoor ventilation, high temperature and humidity, and poor light. The leaf spot of high Ping'an tree is mainly affected by brown spot from April to May every year. Most of the diseases are caused by poor indoor ventilation, high temperature and humidity, and poor illumination, and the leaves produce brown spots. The high incidence period is from April to May every year. Symptoms: mostly occur on new leaves, begin to appear oval yellow brown spots on the leaf surface, and then continue to expand, and more black small particles appear in the front of the leaves, the back of the disease spots is purple, and the whole leaf withers after yellowing Fall off.
Methods of prevention and treatment:
1. If a small amount of diseased leaves are found, they should be removed and burned in time.
2. 1% Bordeaux solution can be used for prevention; 50% carbendazim WP 500 times solution, 50% benomyl WP 1000 times solution, or 50% bactericidal aqua regia 1000 times liquid can be used for prevention, spraying once every 10 days alternately, three to four times continuously.
3. A small amount of disease spots on family potted plants can be smeared with dacrynin cream, which can inhibit the expansion of disease spots. For plants with yellowing and shedding leaves, the root system can be checked. If the root system has been partially rotten, the rotten part will be cut off and replanted with clean and fresh culture soil. A circle of moist fine sand should be surrounded near the cutting edge of root system to promote wound healing and sprout new roots. All the dead branches and leaves can be cut off.
4. After changing the basin, spray more water and less water to keep the basin soil moist. After the middle of April, when the outdoor temperature is not lower than 15 ℃, it can be moved to the outdoor, and after the new leaves grow, the normal fertilization can be resumed.
scale
If there are scale insects on the branches, they should be wiped or brushed off in time or sprayed with special insecticides, otherwise the branches and leaves will wither and fall off.
Reason two: lack of light for a long time.
Control method: the light environment should be sufficient, especially in winter, it should not be placed in half shade or shade, should be maintained with sufficient light environment. In summer, it can shade about 50%.
Reason 3: improper watering.
Control method: the most important part of watering, especially in winter, needs to be watered alternately with dry and wet. Pingan tree likes to be wet, and its leaves are thick and leathery, which can effectively prevent water loss. Therefore, watering should be carried out alternately with dry and wet at this time. Sufficient water is needed to keep the basin soil moist during the vigorous growth period such as summer.
The fourth reason is that the air is dry.
Control method: Cinnamomum cassia likes high humidity environment, should not be put in dry conditions, should often spray water to plants and ground to humidify! Air humidity needs to be kept above 50%, the higher the temperature, the humidity should be correspondingly increased, the best is 50-75%, not more than 80%, otherwise there are more diseases.
The fifth reason: long term fertilization.
Control method: long term no nitrogen fertilizer application or water replacement, lack of nitrogen and other nutrient elements in water, resulting in thin and yellow leaves. It is necessary to change into new culture water in time and gradually increase the application of thin and rotten liquid fertilizer or compound flower fertilizer.
Healthy Ping'an tree daily maintenance temperature: Pingan tree likes high temperature and humid environment, and the best temperature is 22 ℃ to 30 ℃. When the temperature is higher than 32 ℃, it is necessary to build a shed for shading and spray water on the leaves to increase humidity and cool down, so as to maintain its vigorous growth potential. The minimum temperature in winter should not be lower than 5 ℃.
Watering: Ping'an tree likes moist soil, and it should be watered in the morning and evening. In winter, water should be sprayed more and watered less. There should be no water in the basin.
Light: Pingan tree needs better light, but it is shade resistant. It is suitable for half shade environment maintenance, and its light requirement varies with age. If the light is too strong, it is easy to cause yellow leaves and lose consciousness, and reduce its ornamental value.
Fertilization: fertilize Ping'an tree once a month. After autumn, it is necessary to apply phosphorus and potassium fertilizer twice continuously. In winter, all forms of topdressing should be stopped to prevent root damage caused by fertilizer.
Soil: the small plants change the pots once a year, the big plants change the soil once every two years, loosen the soil once a month in the growing season, turn the pots and change the soil time, preferably in spring.
Diseases and insect pests: aphids are easy to grow on the tender leaves and new buds of Pingan tree. After spreading plant ash, wash them with water; spray Melia azedarach leaf juice can effectively kill insects; spray 2000 times of 10% imidacloprid WP.
matters needing attention
Watering should not be too much, which is easy to cause root rot at the bottom;
If the fertilizer is too much and too thick, it will lead to water loss, atrophy and necrosis of vegetative fibrous roots.