What to do if an apple drops? What is the cause of apple tree drops?

Apple fruit drop is mainly caused by malnutrition, it is recommended to use melon and fruit Zhuang Tiling, melon and fruit Zhuang Tiling can self-regulate nutrition matching, play the role of flower preservation, fruit preservation, fruit growth, and fruit drop prevention.

1. The flowering after the final flowering period is the first flowering, and the flowering is mainly caused by poor pollination and fertilization or insufficient nutrition. 2. The pollination tree configuration is unreasonable and the pollen amount is insufficient. The orchard lacks pollinating trees or has inconsistent flowering periods and pollen incompatibility between varieties, resulting in poor pollination and fertilization and flower dropping.

3. There are few pollinators. During the flowering period, there are few pollinating insects such as wall bees and bees, which affects pollination and fertilization, and artificial pollination cannot be carried out in time, resulting in flower drop.

Two weeks before harvesting, spraying 10-20ppm of 2,4-d or sodium dinitrate can effectively prevent apple fruit drop before harvest. Preharvest spraying 20-40 ppm of sodium acid can prevent preharvest fruit drop of marshal apples.

Pre-harvest fruit drop refers to the fact that some varieties begin to drop fruit about 1 month before harvest, and the closer to maturity, the heavier the fruit drop. Such as Zhu, Tsugaru, Hongyu, Marshal, Beidou, Wang Lin and other varieties of serious fruit drop before harvest. Low soil moisture content and excessive nitrogen before harvest will aggravate pre-harvest fruit drop.

Pre-harvest fruit drop is more severe in areas with warm climate or in years where pre-harvest temperatures remain high, especially in areas or years where high temperatures persist at night.

It has been proved by experiments and production practices that spraying -naphthalene acetic acid (sodium) can prevent fruit drop before harvest, and spraying once can be about 20 days before harvest, and the concentration is better at 30 milligrams. If sprayed twice, the first spray can be sprayed 30 to 40 days before harvest, and the second spray can be sprayed 15 to 20 days apart, with a concentration of 20 30 mg liters. The spray focuses on the fruit and the stalk part.

According to the experimental investigation, the marshal variety was sprayed with 20 30 milligrams of naphthalene acetic acid once 15 days before harvesting, and the fruit drop rate was below, while the control was 35%. Naphthalene acetic acid is insoluble in water, and can be dissolved with a small amount of water and more than 2 times the alkaline surface when preparing the pharmaceutical liquid, and then diluted with water.

Foliar sprays of potassium dihydrogen phosphate plus boric acid solution during July and August can reduce fruit drop by 50% to 60%. Spraying 50 milliliters of gibberellin plus urea solution 30 days and 15 days before harvesting, or spraying 2000 milliliters of boron 40 to 60 days before harvesting, can prevent preharvest fruit drop. When the weather is dry, it is necessary to water in time to reduce the fruit drop before harvest, but it is not suitable for flood irrigation to prevent the branches from growing.

Hope mine is helpful to you.

How to deal with apple fruit drop:

1. Thinning flowers and fruits. Flowers that are too dense will cause nutrient deficiency and metabolic disorders. When the fruit is rapidly expanding or close to ripening, the nutrition can not keep up, which will lead to a large amount of fruit falling off, therefore, scientific and reasonable thinning of flowers and fruits is one of the effective measures to prevent and control fruit shedding.

Second, top dressing under the tree. According to the fertility basis of the orchard and the nutritional status of the tree, nitrogen, phosphorus, potassium and other chemical fertilizers can be applied to the fruit trees 20-30 days before the arrival of physiological fruit drop. The prevention effect will be better when high-quality organic fertilizer is applied appropriately.

3. Foliar spraying. In order to quickly replenish the nutrients of the tree and reduce the degree of fruit drop, when the physiological fruit drop is approaching, 2-3 consecutive foliar sprays can be carried out. In order to achieve the purpose of improving the quality of the fruit at the same time, urea and potassium dihydrogen phosphate solution can be sprayed.

4. Spray plant growth regulators. Before the arrival of physiological fruit drop, spray 20-40ppm naphthalene acetic acid dissolution every 10-15 days, and spray 2-3 times continuously, which can effectively control physiological fruit drop, but this measure must be established on the basis of improving tree nutrition to be effective, and the effect on physiological fruit drop caused by other reasons is not obvious.

Solution: 1. Thinning flowers and fruits: If the flowers are too dense, the limbs of the tree will be poor in nutrition and metabolic disorders. When the fruit is rapidly expanding or close to ripening, the nutrients cannot keep up, which will cause a large amount of fruit to fall off.

2. Top dressing under the tree: According to the fertility foundation of the orchard and the nutritional status of the tree, nitrogen, phosphorus, potassium and other chemical fertilizers can be applied to the fruit trees 20 to 30 days before the arrival of physiological fruit drop. 3. Foliar spraying:

In order to quickly replenish the nutrients of the tree and reduce the degree of fruit drop, 2 to 3 consecutive foliar fertilizer sprays can be carried out when physiological fruit drop is approaching.

4. Spraying plant growth regulators: before the arrival of physiological fruit drop, spray 20 to 40ppm naphthalene acetic acid dissolution every 10 to 15 days, and spray 2 to 3 times continuously, which can effectively control physiological fruit drop, but this measure must be established on the basis of improving tree nutrition to be effective, and the physiological fruit drop effect caused by other reasons is not obvious.

Fruit drop: that is, unripe fruit that falls from fruit trees due to poor cultivation management, insufficient fertilizer and moisture, poor pollination, or windy and rainy weather.

1. High temperature: high temperature inhibits the physiological process of apple trees, promotes the production of ethylene, and conducts physiological fruit drop. 2. Calcium fertilizer is insufficient

Calcium fertilizer promotes the toughness of the peel and increases the firmness of the fruit stalk. 3. Poor ventilation and light transmission: improve ventilation and light transmission conditions to reduce fruit drop.

4. Physiological factors of the tree: the nutritional competition between the fruit and the new shoot.

1. The temperature is too high

Fruit drop of apple trees is caused by high temperature, high temperature will destroy the balance of photosynthesis and respiration of apple trees, insufficient water will affect the growth of fruit trees, and high temperature inhibits the physiological process of fruit trees, promotes the production of ethylene, and makes the young fruits of apple trees fall physiologically.

2. Calcium fertilizer is insufficient

Calcium fertilizer can promote the toughness of the peel of the fruit, and can prevent the occurrence of fruit cracking after sufficient supplementation, thereby increasing the firmness of the fruit stalk, and supplementing the apple tree with sufficient calcium fertilizer before fruit picking can reduce the number of fruit drops.

3. Poor ventilation and light transmission

The canopy of apple trees is tall and the branches are dense, which will affect the ventilation and light transmission conditions, and the growth of fruit trees will be inhibited in 2 to 3 days in the state of high temperature, resulting in early physiological fruit drop.

4. Physiological factors of the tree

The fruit drop of the apple tree is also related to the physiological factors of the tree itself, during the growth period, the fruit and the new shoots will compete for nutrients, the nutritional conditions of the fruit are poor, the physiological fruit drop rate is high, the way of twisting the shoots is used to control the growth of the new shoots, alleviate the growth contradiction, and reduce the number of fruit drops.

1. Reasons for falling flowers and fruits.

1 Serious occurrence of pests and diseases Serious pests and diseases directly consume a large amount of nutrients of fruit trees, resulting in insufficient nutrients in flowers and fruits. Cause flowers and fruits to fall.

2 Soil defertilization Insufficient soil fertilization or partial application of certain fertilizers will lead to soil defertilization, which will then manifest as nutrient deficiency in fruit trees. Generally, fruit farmers pay more attention to the combined application of nitrogen, phosphorus and potassium fertilizers, but it is easy to ignore some trace element fertilizers, such as boron, iron, calcium, etc., and these trace elements have a good effect on the flower and fruit stability of fruit trees.

3 Application of allergic pesticides and fertilizers for fruit trees Some fruit trees are more sensitive to some pesticides and fertilizers, and once applied, they will cause pesticide damage and fertilizer damage, resulting in flower and fruit drop.

Summary. Before flowering to the early flowering stage, the application of 2% abundant hormone (Aiduo harvest) water agent 1500-2000 times can increase the fruiting rate by about 17%. Spraying 2000 times of 2% abundant hormone solution from flowering to young fruit stage can reduce the shedding of young fruits and increase the fruit.

After the autumn fruit harvest, strengthen the management of fertilizer and water to improve the nutritional conditions of the tree, combine the autumn pruning to do a good job of clearing the garden, spray the tree protection general before the winter brigade sail to prevent the invasion of diseases and pests, and spray the flower king No. 3 solution after the beginning of spring to promote the differentiation of flower buds, improve the quality of flower buds, and flower more flowering and fruit setting, which is an effective method for fruit drop caused by incomplete development of pistil.

Before flowering to early flowering, the application of 2% abundant hormone (Aiduoshou) water agent 1500-2000 times can increase the fruiting rate by about 17% and the number of forefields. Huishou sprayed 2000 times of 2% abundant hormone from the flowering period to the young fruit stage, which could reduce the shedding of young fruits and increase the fruit. Spine hunger.

1. There are three stages of flower and fruit drop in fruit trees in the physiological period. The first stage of fruit drop: it is 1 2 weeks after flowering, and it is the unenlarged ovary that is lost, mainly due to the lack of pollination and fertilization conditions, incomplete flower apparatus or degeneration of pistils.

The emergence of this phenomenon is mainly due to the poor management of the previous summer, which affected the differentiation of flower buds and the formation of flower organs, or the pollen sterility and low germination rate, and the loss of fertilization ability. Control measures: strengthen fertilizer and water management to improve the nutritional conditions of the tree after fruit harvesting in autumn, do a good job of clearing the garden in combination with autumn pruning, spray tree protection before winter to protect the general tree to prevent and control the invasion of pests and diseases, spray and promote the differentiation of flower buds after the beginning of spring, improve the quality of flower buds, and flower more and fruit set, which is an effective way to drop fruits caused by incomplete development of pistils.

2. The second stage of fruit dropping: it is 3 to 4 weeks after flowering. At this time, the ovary has been expanded, mostly due to incomplete fertilization, the development of the embryo is hindered, the young fruit lacks the hormone of the embryo, or due to the rainy weather during the flowering period, which affects pollination, or the lack of oxygen during the flowering period, the young embryo lacks protein **, and stops developing, which can cause fruit drop.

Control measures: Spraying Zhuangguo Diling solution at the bud stage can thicken the fruit pedicle, improve the amount of nutrient delivery, and prevent flower and fruit drop. For varieties that lack pollination, pollinators should be deployed, or orchard bees and artificial pollination should be used.

3. The third stage of fruit drop: it is a young fruit that has been fertilized, in the process of development, due to the embryo stops developing halfway and causes fruit drop, this period is mostly in early May to early June, when the embryo and the new shoot are in vigorous growth, the period when a large amount of nitrogen is needed, due to the lack of nitrogen, or too heavy to promote the growth of the new shoot, taking away the nutrients needed for fruit development, resulting in the lack of nutrition in the embryo, stop developing and drop the fruit. Prevention and control measures:

In the young fruit stage and fruit expansion stage, spray the strong fruit tiling solution to prevent fruit dropping, cracking, stiff fruit and deformed fruit, so that the fruit is beautiful in color, beautiful in fruit shape and good in taste. We should focus on the appropriate fertilizer and water before the hard core, and adjust the amount of nitrogen fertilizer, not too much and not too little; During the rainy season, it is necessary to drain water in time to prevent water accumulation in the orchard, carry out soil management in time, and improve the root growth conditions. Through summer pruning, the branches are prevented from growing, the light conditions in the canopy are improved, and the photosynthetic capacity of the leaves is improved.

In addition, attention should be paid to the control of pests and diseases to prevent early defoliation.