Diseases of rich trees: what are the common diseases of rich trees? What if the leaves of the rich tree turn yellow?

(1) root (stem) rot

Main symptoms of ①: this is a common disease that seriously damages the rich tree, also known as rot, is the most common disease of the rich tree. When the disease is mild, the leaves turn yellow, and when it is serious, it leads to the death of the whole plant. The disease mainly occurs in the trunk of the wealth tree. In the early stage of the disease, the disease showed a waterlogged brown spot, gradually expanded into a large spot, the disease part was soft, slightly protuberant; when the disease was serious, the disease spot connected into a piece. The part of the disease gradually dried up and sunken, on which there was a large black dot-conidium. The diseased bark finally rotted and showed hemp. Under wet conditions, white filaments gush from the black spots. The branches and leaves on the trunk of the diseased plant grew poorly; the branches were thin and short, and the leaves on them faded and withered; when the disease was serious, the branches and leaves wilted and withered.

The pathogenesis of ②: pathogenic fungi overwintered in diseased branches and stumps or diseased parts, and conidia were transmitted by wind, rain and water droplets, or pruning tools. The wealth trees with weak growth, especially those rented back, are most prone to rot. The root system of the rich tree is very underdeveloped, if it is not fertilized and watered in time, it is easy to weaken the tree potential; it is easy to cause wounds in the process of transportation; spray watering is conducive to the occurrence of diseases.

③ prevention and treatment methods:

A. keep the cultivation environment dry and pay attention to the disinfection of cultivation media and sites.

B. after the semi-finished products are unloaded to the operating shed, the head of the rich tree is sprayed with Sukeling to prevent the harm of Botrytis cinerea.

C. Cut the sprained and rotten tissue from the top of the main root with a sharp knife before planting, then spray the wound with Sukeling and plant it after drying.

D. After one week of planting, the medium in the basin dries gradually, the healing tissue has been formed, and the new root has begun to grow. It is appropriate to spray the smooth rod of the rich tree with pluck, Anke or zinc and manganese (Redomir-manganese zinc) to flow into the basin soil along the pole. Since then, the fungicides have been rotated once a week with Anke, carbendazim, Redomir or Phytopathrin.

E. If Pythium is active, it should be sprayed with Pulek, carbendazim, Redomir or Phytophthorin, and the general effect is about two weeks. If the weather is bad, different chemicals should be sprayed to prevent the development of drug resistance. If festering plants are found during this period, they should be discarded immediately.

(2) Leaf blight

Leaf blight is a disease that often occurs in the growth, development and ornamental process of rich trees.

Prevention and control methods:

A. remove the diseased leaves in time and destroy them.

B. in the process of rich tree cultivation, maintenance and management should be strengthened, timely watering and fertilization, and foliar fertilizer can be applied 3 times every growing season, such as 0.5% potassium dihydrogen phosphate or 200 times of double-effect micro-fertilizer.

C. before the seedlings are transported from the south to the north, the leaves are sprayed with protective fungicides, such as 70% chlorothalonil 800 times, or 18% multi-fungus copper milk powder 200 times, or 50% bacillus 600 times. After being transported to the north, it should be planted in time, strengthen fertilizer and water management, and prevent dehydration and de-fatting. Starting from the rainy season, the cultivation of rich trees in the south can be sprayed with 50% carbendazim every 10-15 days, or 70% chlorothalonil and 1500 times methyl thiophanate.

(3) insect pests

There are mainly sugarcane flat moth, which is found for the first time in China, mainly because the larvae harm the rich tree.

Prevention and control methods:

A. First of all, we should pay attention to prevention. When purchasing a fortune tree, we must select carefully and choose insect-free and disease-free plants.

B. in the process of cultivation, it is necessary to check frequently and detect the insect situation as soon as possible. After the victim is found, the prevention and control should be carried out in time.

C. Clean up the injured department, find diseases and insects, clean up first. Remove the insect feces, find the larvae and crush them in time, and remove the discolored and dead parts after being damaged.

D. Summer is the peak period for the occurrence of sugarcane moth, which should be paid more attention to. It can be protected by spraying insecticides, and it is better to use 2000 times 20% chrysanthemum EC or 2500 times 20% butyl EC.

E. if the damage is serious, it should be removed in time and treated, buried deeply or peeled off all the skin, exposed to the sun, and killed as soon as you see the worm.

Prevention and control of common diseases of rich trees

The common diseases of rich trees are root rot and leaf blight.

Root (stem) rot is a common disease that seriously harms rich trees, also known as rot.

Symptoms: the stem base to the root becomes dark brown and rotten, and the young leaves lose their vitality and wither.

Prevention and control methods: (1) keep the cultivation environment dry and pay attention to the disinfection of cultivation media and sites.

(2) after the semi-finished products are unloaded to the operating shed, the head of the rich tree is sprayed with 1000-1500 times of liquid of must shark to prevent the harm of Botrytis cinerea. (3) cut off the sprained and rotten tissue at the top of the main root with a sharp knife before planting, and then spray the wound with the solution of root rot, and plant it after drying. (4) after a week of planting, the medium in the basin dries gradually, the healing tissue has been formed, and the new root has begun to grow. It is appropriate to spray the polish rod of the rich tree with pluck and Redomir-manganese zinc, and the liquid should flow into the basin soil along the pole. The fungicides since then are rotated once a week with Anke, carbendazim, Remicol or Phytophthora; (5) if Pythium is active, spray with Pythium and Redomir, the general efficacy is about two weeks. If the weather is still bad, different chemicals should be sprayed to prevent the development of drug resistance. If festering plants are found during this period, they should be discarded immediately.

2. Leaf blight

Symptoms: dark brown in the initial stage, gray or dark brown spots like sunburn symptoms inside, and black powder can be seen on the spots for a long time.

Control methods: (1) timely removal of diseased leaves and destruction; (2) maintenance and management should be strengthened in the cultivation of rich trees, timely watering and fertilization, and foliar fertilizer can be applied 2-3 times in each growing season, such as 0.5% potassium dihydrogen phosphate or 200 times of double-effect micro-fertilizer. (3) before the seedlings are transported from the south to the north, protective fungicides are sprayed on the leaves, such as 1000-1500 times of the liquid of must shark, or 200 times of 18% multi-bacterial copper milk powder, or 50% of the solution of bacilli. After being transported to the north, it should be planted in time, strengthen fertilizer and water management, and prevent dehydration and de-fatting. Starting from the rainy season, the cultivation of rich trees in the south can be sprayed with 1000-1500 times of Bichlorothalonil or 70% chlorothalonil and 1500 times of methyl topiramate every 10-15 days.

In addition, the main pest is the sugarcane flat moth, which is a new record in China, mainly because the larvae harm the rich tree, as well as poinsettia, flutung, goose palm wood and Hawaiian coconut.

Prevention and control techniques of common diseases in rich trees

The common diseases of rich trees are root rot and leaf blight.

Root (stem) rot is a common disease that seriously harms rich trees, also known as rot.

Symptoms: the stem base to the root becomes dark brown and rotten, and the young leaves lose their vitality and wither.

Prevention and control methods:

(1) keep the cultivation environment dry and attach importance to the disinfection of cultivation media and sites.

(2) after the semi-finished products are unloaded to the operating shed, the head of the rich tree is sprayed with 1000-1500 times of liquid of must shark to prevent the harm of Botrytis cinerea. (3) cut off the sprained and rotten tissue at the top of the main root with a sharp knife before planting, and then spray the wound with the solution of root rot, and plant it after drying. (4) after a week of planting, the medium in the basin dries gradually, the healing tissue has been formed, and the new root has begun to grow. It is appropriate to spray the polish rod of the rich tree with pluck and Redomir-manganese zinc, and the liquid should flow into the basin soil along the pole. The fungicides since then are rotated once a week with Anke, carbendazim, Remicol or Phytophthora; (5) if Pythium is active, spray with Pythium and Redomir, the general efficacy is about two weeks. If the weather is still bad, different chemicals should be sprayed to prevent the development of drug resistance. If festering plants are found during this period, they should be discarded immediately.

2. Leaf blight

Symptoms: dark brown in the initial stage, gray or dark brown spots like sunburn symptoms inside, and black powder can be seen on the spots for a long time.

Prevention and control methods:

(1) remove the diseased leaves in time and destroy them

(2) the maintenance and management of rich trees should be strengthened in the process of cultivation, timely watering and fertilization, and foliar fertilizer can be applied for 2-3 times in each growing season, such as 0.5% potassium dihydrogen phosphate or 200 times of double-effect micro-fertilizer.

(3) before the seedlings are transported from the south to the north, protective fungicides are sprayed on the leaves, such as 1000-1500 times of the liquid of must shark, or 200 times of 18% multi-bacterial copper milk powder, or 50% of the solution of bacilli. After being transported to the north, it should be planted in time, strengthen fertilizer and water management, and prevent dehydration and de-fatting. Starting from the rainy season, the cultivation of rich trees in the south can be sprayed with 1000-1500 times of Bichlorothalonil or 70% chlorothalonil and 1500 times of methyl topiramate every 10-15 days.

In addition, the main pest is the sugarcane flat moth, which is a new record in China, mainly because the larvae harm the rich tree, as well as poinsettia, flutung, goose palm wood and Hawaiian coconut.