There are many citrus diseases and insect pests in June, what is the reason for a large number of fruit drops? What are the prevention and control measures?

Near June, the weather is hot and dry, the citrus trees are lack of nutrients, there are a large number of fruit drop, farmers are very anxious, it is still in the summer shoot stage, the summer shoot germination will lead to serious fruit drop, some farmers are worried about the empty tip, improper ring cutting will also lead to fruit drop.

How many factors of fruit drop, let's give you a detailed analysis below.

What are the reasons for a large number of citrus fruit drops now?

There are a thousand situations in a thousand orchards, and different orchards vary greatly. There are management problems as well as causes of diseases and insect pests. Which one is it? This also needs to be analyzed by the manager who knows his orchard best, and then take the right seat.

I. Management problems

1. Poor control of summer shoots

Summer is too fierce to have a greater impact on flower and fruit drop, summer shoot and young fruit compete for nutrients, but the fruit can not compete for summer shoot, to the fruit drop ground has been unable to control the momentum of fruit drop. Therefore, citrus fruit protection, the second physiological fruit drop and summer control is a little more important.

Everything has two sides, some managers to prevent excessive summer shoots, spray too much shoot killer or dwarf element, will also cause a large number of citrus fruit drop.

2. Improper ring cutting

For sugar oranges that need to protect fruit, ring cutting has been proved to be the best way to protect fruit, but if it is cut too deep and the wound does not heal, it will cause a lot of fruit loss.

3. Malnutrition

It is more common in fruit trees with partial application of nitrogen fertilizer, such fruit trees have luxuriant branches and fruits compete for nutrients. Once they encounter days of overcast and rainy weather, lack of light, and the initial storage of nutrients can not keep up, a large number of fruits will fall.

In addition, long-term overcast and rain will also cause watery roots, root hypoxia, aggravating fruit drop.

4. Magnesium deficiency in trees

The green leaves of new shoots need the participation of magnesium, and the lack of magnesium in fruit trees will cause the shoots and leaves to compete for magnesium from the fruit, which is characterized by yellowing around the fruit stalk, and then falling, which is what we call yellow pedicel fruit drop.

5. Umbilical yellow fruit drop

In terms of varieties, the navel yellow problem of navel oranges will continue to cause a large number of fruit drops. The hot and dry weather from July to September is often accompanied by the influence of hot and dry wind and strong light. the cause of umbilical yellow is more complicated, so too many anti-umbilical yellow drugs such as xanthate can be used.

Second, the problem of diseases and insects

1. Anthrax, brown rot

In the high temperature and rainy season in summer, the common diseases that cause a large number of fruit drop are anthrax on the stalk, that is, stem-withered anthrax, brown rot and so on. These diseases are prone to fruit drop, and the diseases are easy to occur in closed orchards and poorly managed orchards.

2. Fruit-sucking armyworm, fruit fly

In the fruit expansion period, fruit moth, fruit flies and other pests will also cause a certain amount of fruit drop.

Universal solution

Different methods are used for different situations, but some universal methods can be used.

1. To reduce the use of nitrogen fertilizer, we can apply high potassium foliar fertilizer, such as sugar alcohol chelated potassium, to promote aging and improve the delivery of nutrients to the fruit. If the fruit falls seriously, amine fresh fat can be added to reduce the formation of abscisic acid and further reduce the fruit drop.

2. The sugar orange tree after ring cutting is strong, so it can be repaired again after the wound has healed, and the fruit drop can be reduced.

3. Drought resistance and mulching, leave grass to moisturize and keep warm, or cover orchards with straw to avoid heat damage and fruit drop.

4. Properly replenish water, although it is dry, it is necessary to replenish water to the orchard as far as possible, artificial watering and pipe pumping to maintain a certain level of soil moisture, and for hanging fruit trees or young unhung fruit trees with poor tree body, water solution flushing fertilization can be added to irrigate the orchard to supplement nutrients and improve plant resistance.

Preparing to enter June, with the rising temperatures everywhere, the vast majority of citrus pests have begun to attack. So which pests should be paid most attention to in citrus summer management?

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