Diseases of guava: control of standing blight of common diseases of guava

What to do when guava blight occurs, how to prevent it, what kind of disease is it, let's take a look.

Symptoms: Different guava varieties damaged by Rhizoctonia solani have different disease resistance and symptoms. Generally, after infection, the main symptoms are mainly manifested in the new bud, the new bud becomes brown or black, after the new shoot stops growing, the color of the new leaf turns yellowish green, the leaf shape becomes smaller, occasionally red spots, often starts from the top of a branch of the whole plant, the disease gradually spreads downward, and the disease gradually develops from the branch to the new branch to produce a new infected part, the disease gradually develops to the base of the trunk to the root, and finally causes the plant to wither. The symptom of pear plums and white plums was mainly characterized by epidermal processes on the trunk surface after infection, pale pink spores under the processes, and a large number of spores when the epidermis detached at the later stage. When infected, the mature leaves on the branches turn yellow more easily, the branches wither and gradually spread downward and laterally, finally leading to the death of the whole plant, but the cross-section of the cut branches will appear pale pollen spores, which is slightly different from the symptoms of the old strains.

After the field plants are infected, the symptoms of whole plant death occur at the mature stage of fruit, which has a great impact on farmers 'income. No matter what size guava will be damaged. If guava seedlings are planted in the original planting holes of dead fruit trees, they will also wither in 1~2 years, depending on the speed and degree of infection of the roots of new plants.

Control methods:

1. Treatment of diseased plants:

1. When diseased branches are found, they are sawed off at the points of divergence and then tarred, painted or coated with nanbao resin to protect the wound.

2. Sawn diseased branches and fallen leaves should be collected and burned.

Second, replanting: When replanting, the old soil near the original plant should be dug out and replaced with new soil before planting.

3. Abandoned cultivation: When the diseased plants reach more than 30%, they will be abandoned, the plants will be dug up and burned on the spot, and the orchards will be replanted with other crops.