What are the reasons for the blight of acacia trees?

Gleditsia sinensis, also known as Gleditsia sinensis, is one of the endemic species of the genus Gleditsia in China. It is a deciduous tree with exuberant growth, dioecious. The female tree has strong pod setting ability (Gleditsia sinensis), developed root system, drought tolerance and barren tolerance. It belongs to positive tree species and grows well in places with sufficient sunshine and fertile soil. It blossoms in May every year, and the pods mature from September to October every year. Generally speaking, there are few diseases and insect pests.

With regard to the questions raised above, the analysis may have the following situations:

The main results are as follows: 1. the root growth activity is poor. The growth of branches and leaves of trees is not as luxuriant as in previous years, probably because the tree is older, the ability of absorbing water and nutrients is poor, and the soil structure of the growing area is not loose, and the ability of aeration, water and fertilizer conservation is poor, resulting in poor root growth activity. Solutions: (1) loose soil tending can be carried out to enhance the ventilation of the soil, and the depth of loosening soil should not hurt the root system. In addition, according to the growth of trees, timely watering to meet the requirements of root water. (2) the activity of root system should be enhanced. The big tree root power ② (200ml package is concentrated, diluted 2000 times) can be used for watering. Usage: before watering, open an annular ditch with a depth of about 20 cm at the vertical projection of the crown, loosen the topsoil properly, apply medicine by flooding method to facilitate root absorption, immediately backfill the ditch after irrigation, and irrigate twice at intervals of 15-20 days.

2. Soil fertility is not enough, so strengthen the management of soil and fertilizer.

3. Harm of diseases and insect pests. Observe whether there are diseases and insect pests in the leaves and branches of trees. If so, 2000 times of 20% wettable carbendazim powder can be used to control diseases that harm tree leaves, and 1000 times of omethoate EC can be used to control pests that harm tree leaves. For pests that harm the branches of trees, cotton balls can be used to soak 1000 times of dichlorvos EC to plug the hole, or drill holes oblique to 45 °in the part of the pest, with a hole diameter of 6-8 mm and a depth of 6 cm, and insert directly with tree insecticides, or cut off the damaged branches and burn them.

4. Cut off the inner bore branches, disease and insect branches and withered branches.

5. Growth environment factors. If the air pollution where the trees grow is serious, once it rains to form acid rain, it can make the trees blossom but not bear fruit, and even cause the trees to wither.