How to prevent and control mango dew spots

Tree cultivation: to improve the immunity and disease resistance of trees by supplying organic matter and chemical fertilizers. Regular spraying of protective fungicides and organic chelating calcium fertilizer: prevent bacteria infection, strengthen pulp cells, promote fruit powder, so as to achieve the effect of preventing dew spots. Rational use of regulators: excessive use of regulators will harm the fruit, especially in the middle and later stages as much as possible. Internal and external combination: supplement sufficient calcium and boron elements to strengthen the mango tree to promote powder.

Mango dew spot is the main disease of off-season mango production in Hainan, which is mainly caused by branching bacteria. Some studies have shown that mango dew spot is related to fruit fertilizer management or calcium deficiency in fruit stage. there is also evidence that it is related to fruit wax powder, which is related to the supplement of calcium nutrition.

In fact, mango did not have dew spots before 2000, and it was not until around 2010 that dew spots broke out on a large scale, and this stage happened to be the period of full use of excessive regulators. Many fruit growers blindly pursue the size of mangoes and increase the use of regulators, and do not pay attention to management and cultivation environment, leading to the emergence of this phenomenon.

I. the reasons for the formation of mango dew spots.

The main results are as follows: 1. Due to the improper selection of the park, the planting area is dewy, humid and prone to dew spots in overcast and rainy weather, so choosing sunny land can reduce the probability of occurrence.

2. Due to improper management, the branches are too dense and unventilated, resulting in weak tree potential, greatly reduced disease resistance, and easy to form dew spots at this time.

3. Excessive use of hormones can lead to thinning of fruit skin, damage to trees, reduction of immunity and formation of dew spots.

Second, the prevention of mango dew spots.

1. Tree cultivation

The main results are as follows: (1) the purpose of forming a good tree and improving its immunity and disease resistance can be achieved by replenishing organic matter, chemical fertilizer, root cultivation and so on.

(2) Organic fertilizer or organic water-soluble fertilizer can be supplemented according to soil structure and convenience of operation.

(3) rational use of compound fertilizer, root and tree, improve the overall immunity and disease resistance of the tree.

(4) although this will lead to an increase in input costs (or because contracted trees are unwilling to invest in these costs), it can be done through all parts of the industry, for example, we can certainly find some relatively cost-saving ways to do it. Some trees are relatively cheap, about 3 yuan per tree per year, the public generally can afford to invest, and the value generated by society will be greater than the input.

(5) if we really want to reduce the occurrence of diseases, we should do a good job in basic work, such as tree cultivation. Only in this way can there be healthier trees, reduce all kinds of diseases, and be cheaper and easier to manage.

2. Regular spraying of protective fungicides and organic chelating calcium fertilizer

The main results are as follows: (1) its purpose is to prevent bacterial infection, directly supplement the calcareous nutrition of fruit, strengthen pulp cells, promote fruit pollination and prevent dew spots.

(2) the application method of organic chelating calcium fertilizer is that the organic chelating calcium fertilizer is sprayed regularly on the leaves after the fruit is fixed.

(3) it can also promote fruit pollination and prevent dew spots. Strengthen fruit cell wall, prevent fruit cracking, hollow, water rot, and improve fruit disease resistance.

3. Rational use of regulators

The main results are as follows: (1) appropriately reduce the continuous use of internal absorption agents. It is suggested that the use of regulators can be reduced in the middle and later stage, especially after stopping stretching drugs.

(2) the use of regulators is very important, but attention should be paid to the dose and not to overdose.

(3) although there will not be visible disasters, but each overuse of regulators is a kind of harm to mango, blindly pursuing the size of mango is by no means a healthy way of management.

(4) in addition, strong internal absorption agents are easy to hurt the pericarp and destroy the fruit powder, especially in the middle and later stages to minimize or interval the use of such agents to avoid causing too much pressure and damage to the pericarp.

4. Combination of internal and external

(1) promote pollination, improve the disease resistance of mango, and reduce dew spots.

(2) if there is a healthy mango tree and enough calcium and boron supplement, it is helpful to powder the mango.

(3) it is important for mangoes to powder evenly, because it is difficult for mangoes to be soaked in dew or wet weather.

(4) if soaking only stays on the fruit powder, it will not touch the pericarp, which can protect the pericarp.