Physiological diseases of rich trees

The diseases caused by mismanagement of rich trees are called physiological diseases, which mainly include freezing injury, weak growth and so on.

Frost damage

The lowest temperature of the rich tree overwintering is 8 ℃. If the temperature is lower than 8 ℃, it is easy to cause frost injury. The rich tree is easy to lose its leaves after freezing, and the whole tree dies when it is serious.

The branches are thin and the books become longer.

This is mainly due to lack of light or too small spacing between plants and rows. The rich tree has a wide range of adaptation to light, but it is not suitable to live in an environment where the light is too weak for a long time. For the plants with the above symptoms, cut short the unsightly branches, move the plants to a position with sufficient scattered light, and maintain a more appropriate density. It should be noted that do not move the "long deficiency" plants directly to the direct sunlight to avoid sunburn.

Symptoms and control methods of retting root and leaf spot in rich trees

Etiology: physiological diseases caused by improper management of fertilizer and water. Symptoms: the disease causes many large disease spots, affecting ornamental and growth. The disease spots as thin as paper appear on many leaves, showing irregular shape, and the boundary of the healthy part is not obvious. The leaves are a little faded and dull. The root system was wet-rotten and brown.

Characteristics of the disease: the roots of rich trees are underdeveloped, and the trees with poorly developed roots often show symptoms of lack of water, while excessive watering in the process of maintenance, and then encounter continuous rainy days or low temperature (less than 16 ℃), often cause root rot. Control method: the disease is controlled by cultivation techniques. Trees with healthy roots should be selected when buying; fertilizer and water management should be done according to the weather and temperature, and the water content of the substrate is about 60% (that is, grasp the matrix by hand and spread out after letting go). Fertilizer should be applied once in half a month in the peak growing season, and appropriate amount of phosphorus and potassium fertilizer should be applied; foliar fertilizer should be sprayed to maintain the root system when the root system is rotten at the beginning of the season; and sufficient light should be given in winter.

Related topics: prevention and control of retting root and leaf spot of Daquan rich tree (Malaba chestnut)

The disease is a physiological disease caused by improper management of fertilizer and water. The rich trees with underdeveloped roots often show symptoms of lack of water, while excessive watering in the maintenance process and continuous rainy days or low temperatures (less than 16 ℃) often lead to root rot.

The disease causes many major disease spots, affecting ornamental and growth. The disease spots as thin as paper appear on many leaves, showing irregular shape, and the boundary of the healthy part is not obvious. The leaves are a little faded and dull. The root system was wet-rotten and brown.

Prevention and control methods: no better control method has been found for the time being, so it is suggested to strengthen the prevention of the disease.

The main results are as follows: (1) trees with healthy roots should be selected when buying.

(2) Fertilizer and water management should be done according to the weather and temperature. The water content of the matrix is about 60% (that is, grasp the matrix by hand and spread out after letting go). Fertilizer should be applied once in half a month in the peak growing season, and appropriate amount of phosphorus and potassium fertilizer should be applied.

(3) the root system should be maintained by spraying foliar fertilizer when the root system is rotten at the beginning.

(4) sufficient light in winter.