Causes and Solutions of sudden Yellow leaves and fallen leaves of Luohansong leaves

Luohan pine has always been a beloved tree species, with its unique shape and meaning, simple and natural form, vigorous and powerful branches, as well as its own characteristics: slow growth and difficulty in maintenance. Therefore, the prices of lohan pine on the market are relatively high. In recent years, more and more private courtyards or high-end villas will use some Luohan pine, then the planted lohan pine will often have some problems, such as: fallen leaves, yellow leaves, etc., what is the reason? How to solve it? let me share it with you today.

First of all, when you find something abnormal in the leaves of Luohansong, especially the yellow leaves, you have to observe whether it starts from the tender leaves, and most of the position will be at the tip and edge of the leaves. And there will be small spots in these places. And form a trend of gradual expansion.

In fact, this is the state of infection, and its pathogenesis is that: in the whole process of the disease, the green will turn green-the macula will appear-the macula will enlarge and turn brown-the area gradually expands-half a leaf-and finally the whole leaf begins to turn yellow. This is the fungal disease that occurs on the pine.

This kind of fungal disease is a half-known fungus, which forms hyphae in withered branches and leaves and overwinters, but in the next spring, the pathogen invades the tender leaves or invades the branches from the wound. after the pathogen invades, the host nutrients are absorbed and a conidial disk is formed under the epidermis, and then many conidia are released in the season of high temperature and humidity, so that the disease is gradually expanded or serious. And why do you get sick first from the top of the tree? The main reason is that the planting soil is relatively clingy, the permeability of water and air is relatively poor, and the root system at the bottom is easy to rot, and only rely on the surface root system to absorb water and nutrients, which is not sufficient, but the absorption at the top will be blocked naturally, resulting in poor resistance to the top leaves and getting sick first.

If solved, first check the root, and do drainage around, and the setting of triangular exhaust pipe. On the other hand, remove the multi-leaf area, if the pathogen has occurred more seriously, cut off the diseased branches and leaves, and then smear the damaged branches and leaves on the wound, the smear agent is recommended to add fungicides and indoleacetic acid rooting agents. If it is serious, the soil should be replaced to increase the proportion of coarse sand.

If you also like to grow flowers, trees or succulent plants, remember to pay attention.