What causes dead cherry trees? How to prevent dead cherry trees? For planting cherry farmers, it is important to understand these issues. In this article, we will do a detailed summary, I hope to help farmers better solve the problem of cherry tree dead branches.

One, the rootstock affinity is poor

The large cherry seedlings are mainly grafted breeding, so the choice of rootstock is particularly important. Rootstock affects the entire growth and development process of the scion species, if you choose to graft the rootstock affinity is not enough, it is easy to cause the occurrence of dead branches. Therefore, the selection of rootstocks with strong affinity for large cherry grafting, such as the use of group culture propagation of excellent dwarfing rootstock ZY-1, Gisela 5, Maharishi and other grafted large cherry seedlings, planting a high rate of survival is one of the key means of preventing cherry dead branches.

Two, the impact of adverse environmental

1. drought, flooding occurs

Darling cherry on the favorable environment is more stringent, neither drought, nor waterlogging, requires a better soil permeability. Orchard for a long time under the conditions of drought, tree growth will be hindered, inhibit the growth of new growth and pumping, leaf wilt and yellow, affecting the quality of bud differentiation, tree weakness, resistance to pests and diseases ability to decline, seriously cause the tree drought death. After continuous rainfall, if the orchard is not properly drained, the orchard is seriously waterlogged, and the root system of large cherries is immersed in water for too long, it will inhibit the respiration of the root system, leading to root rot, necrosis, and in severe cases, resulting in dead branches and dead trees. Therefore, in the management process of the orchard, reasonable regulation of water is very important, requiring a sound drainage system, adequate water sources and complete irrigation facilities.

2. The occurrence of freezing

Big cherry growth by the influence of climate is greater, in the case of severe cold, inverted spring cold and other harsh natural environments, such as insufficient tree nutrients, anti-freezing cold measures are not in place, it is very easy to cause frost damage. Cherry roots, root neck, branches, leaf parts are susceptible to frost damage. Especially root and neck frost damage, once occurred, the bark blackened, cracked, rough, peeling, frost damage severe around the trunk of a week cause tree death.

Preventive measures:

(1) Try to choose the varieties that sprout and bloom after the high frost period.

(2) Winter irrigation, spraying cold- and frost-resistant foliar fertilizers, and bunching of grasses to prevent freezing in winter can be taken as anti-cold and anti-freezing measures. You can also delay the budding and flowering period through measures such as trunk whitening and early spring watering.

(3) Through reasonable loading, rational fertilization and watering, scientific pruning, integrated pest control and other measures to enhance the tree's strength and the tree's nutritional level, improve cold resistance.

Three, tree nutritional deficiencies

1. Fertilizer unreasonable

Fertilizer unreasonable especially in the large cherry fruit picking, did not timely application of monthly fertilizer, autumn fertilizer basal fertilizer insufficient or do not apply, insufficient supply of fertilizer and water, resulting in the tree nutrient deficit, the next year, after the budding will be the tree body storage nutrient depletion, and the root system has not yet begun to absorb nutrients, resulting in the tree branches were drained and died.

2. Mismanagement

Pruning is unreasonable with too much fruit retention, especially the excessive application of doxorubicin for many years in a row.

The above two situations superimposed, resulting in tree weakness, tree significantly older, resulting in gradual drying and death of the tree.

Therefore, the large cherry physiological period, fertilizer and water supply is sufficient, scientific management and thus enhance the tree is vital.

Four, pests and diseases

Branch blight, root cancer, invasive rheumatism and dry rot is the main disease in the production of large cherry, the prevention and treatment of untimely can cause the death of the whole plant. Insects such as aspen and other pests destroy the tree's nutrient organs, causing the tree to gradually dry up and die.

1. Diseases caused by

1) branch blight

The biggest danger of large cherry branch blight is to cause a large number of branches to die, weakening the tree. Especially 3 to 4 years old cherry trees are more seriously affected. Symptoms show that the skin is flaccid and slightly wrinkled, with small black dots. Coarse branches infected with disease around the slightly elevated, the center of the depression, was longitudinal cracking like flowering buns, serious xylem exposure, the disease was born light brown elevated spots, often secretion of resin.

Prevention methods: strengthen the management of water and fertilizer, enhance the tree, spray fungicides in advance to prevent, cut off the diseased branches in a timely manner, the winter can be taken to bunch of grass to prevent freezing and other cold anti-freezing measures.

2) dry rot

Cherry dry rot is a fungal disease, symptoms of a variety of manifestations, most of the manifestations of the onset of the branches, trunk, frost or trauma easily induced the occurrence of the disease, more susceptible to freezing of the 2 ~ 3 branches of the middle and rear parts of the occurrence. Weak trees can also induce the disease.

Prevention methods:

a, strengthen the management of the orchard, especially the management of soil, fertilizer and water should be in place, the dormant period of the fruit orchard, combined with pruning and clearing of the orchard, cut out and destroy all kinds of diseased branches, insect branches or dead branches;

b, before the germination of the cherry tree (in early April of each year), the branches and trunks of the spraying of 1 time of Pomerol 3-5 degrees of stone sulfur, or add 2% sodium salt of pentachlorophenol, eradication of the overwintering Diseases and insects, to achieve the purpose of protecting the branches and trunks.

c, on the branches and trunks with spots, scrape thoroughly as early as possible, scrape at the onset of the early stage of the disease is the best effect, and at the same time, disinfect and protect with agents.

3) Rheumatism

Mainly harmful to the main trunk and main branches of cherry, generally occurring in April-October, resulting in weakening of the tree, and in severe cases, the branches and trunks die. Gum disease mainly occurs in the fruit tree, weak tree or improper management of the tree is more likely to occur. Pathogen infestation, improper management, environmental discomfort, pests and diseases can all contribute to the development of gum disease.

Control technology: prevention and control of rheumatism, should be prevention-oriented.

4) Top blight

Top blight disease is characterized by the emergence of dead tips and branches starting from the top of the tree and spreading to the whole tree, resulting in the death of the tree. The cause of the disease is mainly due to sulfur deficiency.

Prevention methods: a cherry tree can be supplemented with 100g-150g sulfur powder. Mix the sulfur powder with the soil and apply it evenly near the soil between the roots of the tree can be.

5) Root cancer

Root cancer is caused by bacteria of the genus Soil Bacillus. It mainly invades the plant through various wounds such as cuts, mechanical damage, insect damage, hail damage, and frostbite.

Preventive measures:

Taking prevention as the mainstay, reasonable pruning, scientific fertilization, and strengthening the tree are crucial. Conventional control compounds are copper preparations. Better compounds for prevention and control, the first cherry root soil peeling, excision of disease tumors and burned, sun-dried wounds, with Chunleiomycin, mesosporin, thiazole zinc, thiabendazole copper irrigation, and then mulch, mulch is best used for guest soil.