What are the precautions for spraying fruit trees in summer?

When spraying fruit trees in summer, first of all, you must pay attention to the fact that there is no rain before spraying, or that the seedlings are not watered.

First of all, it is necessary to choose the right time, and do not spray when the problem is relatively high, you must choose a more cost-effective and safer drug, and then you also need to pay attention to the concentration of the drug, and then in the process of spraying, you must wear the corresponding equipment.

Be sure to pay attention to the time of spraying, as well as the temperature when spraying, the method of spraying and the concentration of spraying, as well as the number of times, if the time is not right, it is likely to cause the plant to die.

High temperature and high humidity in summer can easily lead to the prevalence and flooding of fruit tree diseases and pests, and summer is also the stage when fruit trees are more sensitive to pesticides. What should I pay special attention to when spraying fruit trees in summer?

Common problems of fruit tree summer spraying

Spraying time many growers feel that the higher the temperature when spraying, the higher the temperature, spraying under high temperature and strong light, at this time most of the insect pests will start theme activities, hiding in a cool area, not suitable for being sprayed by pesticides, the agent evaporates faster under continuous high temperature, and the efficacy dissolves quickly, at this time spraying will reduce the drug power. Spraying at continuous high temperatures, the volatiles of the agent are strong, and it is very easy for the spraying staff to be poisoned. There are also many growers who like to spray in the morning, when the dew is not dry, the dew will be diluted by the dew after spraying, reducing the drug power and the control effect is weak.

The concentration value of the agent must be well controlled, the growth and development of fruit trees is more sensitive to pesticides, the concentration value is too easy to produce pesticide damage, and the concentration value is too heavy will reduce the control effect, so it is necessary to strictly grasp the concentration value of the preparation. Wear protective clothing when spraying. Wear a mask and clean up your whole body after spraying to prevent pesticide poisoning.

When spraying fruit trees, it must be evenly sparsely planted, fruit trees are lush in summer, and the aggression of insect pests is strong, so that the fruit and leaves need to be sprayed on both sides, and according to the habits of insect pests, concentrate on spraying prevention in the habitat area.

Fruit tree pesticide diseases and preventive measures

<> the drug damage disease fruit tree is not the same in different positions, when the bud produces drug damage, everything can not germinate normally, and the bud is black and withered when it is more serious; After the branch has pesticide damage, the phloem of the trunk turns brown, and when it is more serious, it will broaden to other branches, and after 5-7 days, the whole leaf turns yellow and falls off or is dry and scorched, which causes some branches to wither, and some damaged branches will continue to repair and grow new shoots.

The primary factor for the cause of pesticide damage in fruit trees is the quality of pesticides. The quality of pesticides is weak, and the natural environment is also one of the key factors that cause pesticide damage, such as spraying pesticides, the medicine is not dry in the rain or the temperature is too high, which will lead to pesticide damage to fruit trees.

What problems need to be paid attention to when spraying fruit trees? In hot weather, the temperature between 10 o'clock and 15 o'clock is very high, and there are three main reasons why pesticides cannot be sprayed at this time.

Evaporation is too fast, when the liquid medicine is sprayed, due to the high temperature, the liquid medicine has not been absorbed, the water will be evaporated, if the concentration is large, it is easy to cause pesticide damage to crops. The effect deteriorates, when the pesticide is sprayed, the temperature is too high, and the decomposition is relatively fast, especially the pesticide with systemic properties, and the time for the liquid medicine to take effect is relatively slow, resulting in the deterioration of the effect. The applicator is not safe, and the person is prone to heat stroke when applying the pesticide in high temperature weather, and the volatilization of the liquid medicine can easily lead to poisoning of the applicator.

In the management of fruit trees, there may be less underground management, but pesticides sprayed on the trees must be selected and cheap, low-quality pesticides are not allowed. Good medicine can prevent insects and diseases. Money is not a waste, but a work economy.

The choice of medicine is appropriate, not for the sake of healing, but for the sake of harm. In alkaline and hot climates, spraying chemicals on fruit trees can cause delays. Care must be taken when spraying chemicals at the young fruit stage.

Young fruits are like babies in a mixture. Pericardial cells are sensitive to pressure from chemicals and require good atomization.

Spray about 50 cm away from the young fruit, otherwise it will form fruit rust or burst stars, the fruit surface is rough, causing low temperature to affect the efficiency, and spraying heat in spring; The summer is cold, the general temperature is 25 to 28 degrees, and the effect is the best, such as imidacloprid to resist low temperature; Acetamiprid ethyl ester and spirochetes above 28 degrees have the best effect; At noon in spring, the concentration of high-temperature spray should not be too high, because the high temperature is easy to evaporate the water in the solution, and the water molecules in the liquid medicine are rapidly diffused and dispersed in the air. In fact, this basically equates to improved compatibility, and it can't be mixed. Fruit trees are susceptible to plagues such as fleas and red spiders.

When spraying, foliar fruit trees should be planted, and pest control is the focus

Hold it in the rainy season.

Pre-flowering control () and spraying 5 Baumé stone sulfur mixture to control tree rot disease, inhibiting overwintering red spider reproduction, control of leaf-rolling insects, scale insects, obvious effect spraying 40 Fumei arsenic 100 times liquid (2) germination control garden spraying 45 crystal humilite sulfur mixture 150 200 times liquid or spraying 3 Baumé stone sulfur mixture plus 50 1605 emulsifiable concentrate 1000 times liquid to kill 90 red spider bud overwintering bai fen disease, defoliation disease and other fungal spores to control beetle aphids (3) germination before flower control spray 50 1605 emulsifiable concentrate 1500 times liquid or 80 dichlorvos 1200 1500 times liquid or dichloride and chrysanthemum vinegar pesticide 2500 3000 times liquid insect pests and rot disease obvious control effect.

2. Flower control () Flowers continue to spray Baumé stone sulfur mixture to control leaves, diseases and red spider spray kung fu 2500 3000 times liquid both to prevent red spiders to kill leaf-eating insects, insectivorous eggs (2) flower 10 15 spray 1:4:20 Boer liquid (1 kg of copper sulfate, 4 kg of lime, 20 kg of water) or spray 40 mycete, antibacterial special 600 800 times liquid to prevent and control rain, high temperature prone to defoliation, anthracnose, brown spot (3) flowers in January, it is strictly forbidden to use thiamine dichlorvos.

The answer to this question should be considered from many aspects, not only to pay attention to the type, toxicity and residue of pesticides, but also to pay attention to the concentration and dosage of use, and also pay attention to the timing of the application of pesticides to crops in the flowering stage.

1. Prevent the application of highly toxic and high-residue pesticides. Generally speaking, the flowering period of crops is the critical period for the formation of fruits and grains, when most of the substances absorbed by the vegetative organs such as stems and leaves of crops are transported to the fruits or ears, and some of them will form the constituent substances of fruits or ears. Therefore, in the crop flowering period, we must choose high-efficiency, low-toxicity and low-residue pesticides, and must not choose highly toxic and high-residue pesticides, in order to prevent excessive pesticide content in fruits and grains, polluting crop products, especially for food crops and fruits and vegetables, to prevent affecting the health of eaters.

Second, some pesticides are harmful to crops at the flowering stage. For example, cucumbers, watermelons, eggplants and other crops are sensitive to the herbicide acetochlor (Genes), especially in the flowering stage, vigorous growth of plants, young shoots can absorb drugs, it is easy to appear pesticide symptoms, when using this kind of herbicides, special attention should be paid to the choice of spraying in windless weather where the temperature is not too high, do not let the drug contact these sensitive crops. Profenofos is a common agent used in recent years to control rice leaf roller, but the use of the drug must be used before the rice breaking stage, if applied at the flowering stage or grain filling stage, it will make the rice produce peculiar smell and difficult to eat.

1.The best time to spray.

The purpose of spring clearing is to eradicate overwintering germs and pests. The most important means is spraying.

Fruit tree spraying is not too many times, the key is to hit accurately, and to use medicine in the critical period of disease prevention and control.

However, the breeding of germs in spring, the sting of pests is directly affected by the temperature, and after the sting, when the temperature stabilizes above 18, it is the best time to use medicine. For example, stone sulfur mixture, insecticide, bactericide and so on.

The temperature is low, there is no activity of pests and diseases, it is difficult for the medicinal properties to play a role, and the control effect is also greatly discounted. In the spring, we must grasp the best time to spray.

2.Orchard cleaning should be done carefully.

Most of the germs and eggs overwinter in the dead branches and leaves, diseased fruits, and dead fruits, and it is important to clear these things out of the orchard.

However, most growers do not pay enough attention to this, and very few can seriously clean the orchard floor.

3.The choice of pharmacy should be scientific.

Some fruit farmers like to use stone sulfur mixture when clearing the garden, but they are reluctant to buy high-quality products, and the quality of their own boiling is often very poor, and some like to use Fumeiarsine, which leads to a large amount of pesticide residues and affects fruit sales.

Insecticidal and sterilization products should choose pollution-free green products or biological agents, not only to ensure high efficiency, but also to pay attention to safety.

4.Spraying should be meticulous.

In spring, there are no leaves in the garden, and most fruit farmers use very little water, and most of them are coarse and coarse.

In fact, if you want to spray the medicine carefully all over the rough skin, cracks, branches, etc., the water consumption per mu should not be less than 250-300 kg.

Otherwise, it will be difficult to remove pests where they can't be sprayed.

5.Spray all the trees underground.

Most growers only pay attention to spraying on the trees, and few pay attention to spraying the ground.

It is important to know that the topsoil is the overwintering site for many pests and diseases, and when the temperature rises, they will emerge and sting on the trees.

In general, insect control is best when the insects have not grown up and are small insects. At this time, the limbs of the insects are extremely weak, and they are easily affected by the natural environment such as climate and geographical conditions, and it is easier to achieve the effect of pesticides. Therefore, the best time to prevent insects is around April, depending on the growing environment and climate of the place.

Of course, it should be noted that insect control is not all drugs can be used casually, we have to prescribe the right medicine according to the situation of crops and crop diseases and pests. Therefore, you should choose different control methods according to the situation you encounter, and use different methods for different pests to achieve the best results.