How to manage spring seedlings? What are spring seedling management techniques?

The management of spring seedlings mainly pays attention to the prevention of diseases, fertilizers, moisture and frost. Common diseases of spring seedlings include cataplexy, blight, root rot and so on. In spring, it is necessary to avoid over-thickening the top dressing, and try to use dilute and well-rotted fertilizer to water the seedlings.

In early spring, it is necessary to keep warm before frost and cold snaps according to the cooling situation.

When managing seedlings in spring, attention should be paid to temperature and water sources. Therefore, measures should be taken to protect the seedlings from cold and frost. Then pay attention to watering to prevent spring drought.

Fertilization, watering, pruning, light, temperature, different plants have different nutrient needs, and must be managed scientifically.

Do not overwater, to ensure normal light, choose the right insecticides, fertilizers, spring seedlings maintenance misunderstanding is overwatering.

It is necessary to pay attention to the temperature, pay attention to the moisture, do a good job in the vaccine work, you can model the paving of the slag film, prune the branches and leaves in time, prevent pests and diseases, and water and fertilize frequently; Don't water or fertilize the beams at once.

Pay attention to temperature, pay attention to humidity, pay attention to the condition of the soil, fertilize on time, water on time, choose the right pesticide to use, do not apply too much fertilizer to the seedlings, do not water too much, it will lead to corruption.

Pay attention to the soil condition, pay attention to the surrounding conditions, need to prepare in advance, need to compost, pay attention to spraying pesticides, pay attention to pruning, it is not that the more fertilizer is blind, the better the green, not the more water, the better the grinding ball.

After entering the spring, with the warming of the temperature and the increase of rain, some temperature-sensitive seedlings begin to germinate and begin to breed pests and diseases, and the spring management of seedlings is particularly important. So what are the main pests of spring seedlings? Next, I will introduce to you the spring seedling pest control technology.

Pest control technology for spring seedlings

1.Aphids

It is very common on seedlings in this area, and its hosts mainly include large-leaved boxwood, red leaf plum, peach, begonia, firethorn, violet, moon, oleander, etc. Not only does it cause leaf shriveling and poor growth, but it also makes it easy for seedlings to get sick. When the temperature is suitable, aphids multiply rapidly and the range of occurrence expands rapidly.

Measures: Damage should be dealt with at the first sight, especially on plots that were severely damaged in the previous year. 800 sprays with 40 percent toxosporine or 2,500 sprays with 25 percent cypermethrin.

2.Powdery mildew

Powdery mildew is a major disease on seedlings, and there are many susceptible tree species, including violets, peaches, moon flowers, narrow-leaved tengongs, large-leaved boxwood, etc. As the temperature rises, the amount of rainfall increases, and it will happen one after another.

Measures: When the new shoots grow to a certain extent, they can be sprayed with 600 times the solution.

For seedlings that have already occurred, it is necessary to seize the initial stage of the disease, and use 15% powder rust rather than wetting powder 1,500 times the solution. If the condition is severe, spray again every two weeks or so.

3.Mealworms

The seedlings of star poplar and peach-necked poplar in our area mainly occur in the host trunk with larvae for overwintering, especially poplar, willow, elm, sapling, luan, peach, plum and other tree species, once the ground around the trunk appears fresh insect droppings, indicating that the overwintering larvae have begun to feed, once the ground around the trunk appears fresh manure.

Procedure: It should be killed by using a wire hook or plugging the hole with a thirty-fold solution of poison wire or dichlorvos.

4.Leaf mites and crown mites

In late March, leaf mites will begin to be active on some seedlings.

Measures: Spray 15% of the dipyridoxin emulsifier. Crested mites affecting rhododendrons, firethorn, peaches, plums, safflowers, and cherry blossoms are expected to emerge from late April.

Chemical control, the use of avermectin 2500 times or 2.5 percent of the 3,000 times of the extravaghanin, spraying with the back of the leaf as the focus.

Aphids, wild borers, boxwood moths, scale insects, grubs, these are relatively common, and they must be treated in time and sprayed with pesticides on time.

There are many, such as aphids, spider mites, scale insects, blight, powdery mildew, etc., to spray pesticides, pay attention to the composition of pesticides, pay attention to the efficacy.

Spring seedling management, after entering the spring, the spring flowers bloom, the temperature gradually began to rise, the rain also increased, began to breed pests and diseases, if some seedlings have strong temperature sensitivity, also began to sprout, so, should be in accordance with the specific situation, timely strengthen the early spring management of the seedling base. The climate is more unstable in early spring, and there is a large range of changes in heating and cooling, and the temperature difference between morning and evening is large, especially in the night when the rain and snow are clear. From time to time, frost weather will occur, which can easily cause temperature inversion to damage seedlings.

Therefore, it is important to do a good job of timely anti-freeze work. If the seedlings are cultivated in protected land, a lack of cover must be before the frost and cold wave come, the greenhouse will be buckled; If necessary, according to the cooling conditions, the grass and other canopy cover should be covered on the shed film; For some precious seedlings, small arch film can also be set up in the shed to increase temperature and protect seedlings; When the weather is dark, you can uncover it in time to receive light; The temperature rises very quickly at noon on a sunny day, in order to avoid the phenomenon of burning seedlings when the temperature rises in the shed.

The temperature in the shed must be strictly injected, and the film and windows must be opened moderately. Ventilation lowers temperatures; If the seedling base adopts open field seedlings, before the strong cold wave, the barrier should be set in the north to resist the attack of cold wave and low temperature. If the seedling base is located in the spring rain and snow and low-lying terrain, if the soil has too much stupid width and water content, not only makes the soil overflow reduced, and the permeability is poor, the growth of the seedling root system will have a serious impact, and even causes the seedling to rot and die seedlings, which is not conducive to the recovery of the seedling warm.

Therefore, in the spring, the ditch cleaning work around the seedling field should be completed before the rain, and the original drainage ditch system should be cleaned once; If there is no drainage ditch, the drainage ditch should be added, and the existing one should be deepened appropriately, so that the clear water can be discharged, the dark water can be filtered, and there is no water accumulation in the seedling base after the rain. <>

Shaping and trimming. In the north, pruning and shaping are carried out from December to March, and the trees are cultivated in beautiful shape. In spring, you can continue to prune the dead branches, clump branches, long branches, cross branches, diseased and insect branches of seedlings, etc., and also need to prune the chixiao branches that suffer from frost damage in winter, and pay attention to the disinfection and sterilization of branch cuts, and at the same time apply healing agent treatment to the large cuts containing large yards.

Special attention should be paid to the seedlings of the maple family to be pruned late after the leaf bud germination, and the pruning is too early and the flow is serious. Spraying stone sulfur mixture in early spring In the north, before the seedlings germinate from early March to early April, 3-6 Baumé stone sulfur mixtures are sprayed according to the varieties of seedlings to sterilize, kill eggs and kill overwintering spores, and reduce the occurrence of seedling diseases and insect pests. The use of self-made stone sulfur mixture, insecticide, sterilization effect is also good, can prevent the occurrence of pests and diseases.

In recent years, the climate has been unpredictable across the country, and ice, snow, and low temperature weather have become more frequent and prolonged. Abnormal weather such as inverted spring cold often occurs in spring, which has a great impact on trees that have bloomed and are sprouting leaves, often leading to premature flower bud senescence, frostbite and frostbite of new sprouts and new leaves, which seriously affects the normal growth of seedlings.

The best time to prune is before the flowers and trees sprout. At this time, the nutrients of deciduous trees are mostly concentrated in the roots and body of the tree, and the nutrients in the branches are less, and pruning can reduce the loss of nutrients and reduce the infection of wounds by pathogens. When pruning, Butan fiber pin only needs to cut off diseased and insect branches, dead branches, overlapping branches, and over-dense branches, and also cut some longer flowering branches and vegetative branches.

For flowering shrubs, the more flowers bloom, the greater the nutrient consumption and the smaller the vegetative growth, and conversely, the fewer flowers bloom, the greater the vegetative growth. For the flowers and trees that are being cultivated, the flower buds can be erased during pruning, so as to reduce nutrient consumption and use the limited nutrients for growth. Depending on the tree species, the vertical hand should also consider setting the trunk height, beautifying the tree type, balancing the tree potential, etc.

Watering in early spring can effectively reduce the ground temperature, delay the germination of seedlings, and protect them from the harm of late frost and inverted spring cold. In spring, the air is dry, the evaporation is large, and the flowering and germination of flowers and trees need to consume a lot of water. Therefore, watering should be done sooner rather than later, and flood irrigation should be avoided.

Nursery winter seedling maintenance knowledge - fertilizer before winter should be based on farmhouse fertilizer and compound fertilizer, no or less nitrogen fertilizer. If excessive nitrogen fertilizer is applied, it will cause the seedling branches to grow vigorously, the degree of lignification is low, and the cold resistance is reduced. Fertilizer should be applied to the lateral roots of seedlings.

1. Paint the trunk white.

Taking advantage of the fine weather to coat the branches with a happy forest whitening agent can reduce the damage to the sunny side of the seedling due to the excessive temperature difference between day and night, and at the same time can also kill the overwintering germs and insect eggs.

2. The backbone "dresses".

For seedlings that are not cold-tolerant, the main stem and part of the main branches should be rolled dry with straw or wrapped with straw, so that the seedlings can wear "cotton clothes" before the arrival of winter to prevent frost damage.

3. Scrape the skin and apply medicine.

At the beginning of winter, the diseased skin and insect-eaten skin of the main trunk, large branches and branches of the seedlings should be scraped off as soon as possible, and burned or buried deep in a concentrated manner to eliminate the germs and eggs that overwinter in the bark. The depth of skin scraping should be slightly yellow-green in the cortex, and the callus cream should be applied to the wound to place the loss of water and nutrients and promote the early healing of the wound.

4. Set up obstacles to resist the wind.

In order to resist and mitigate the damage that cold and dry winds may cause to seedlings, a windproof wall should be erected in the upwind direction of the nursery before wintering. The height of the windbreak wall should be higher than the height of the tree. In addition, the windbreak wall should be fixed with wooden sticks, bamboo poles, etc., to prevent it from being blown down by strong winds.

5. Water control and anti-freezing.

After entering the winter, the water should be strictly controlled, and there is generally no need for watering except for special droughts. Because if the water content of the tree is too large, once it encounters low temperatures, the tree will freeze and expand, causing the bark to crack and cause the seedlings to die.

6. Spraying to eliminate damage.

After the seedlings fall leaves, they should be sprayed with 5 Baumé stone sulfur mixture and 200 times sodium pentachlorophenol solution to eliminate overwintering germs and insect eggs.

1. Pay attention to the pruning and shaping of the branches and leaves of deciduous plants. 2. Top dressing before winter, pay attention to winter flowering plants such as plum and spring flowering plants. 3. Plants that are not cold-tolerant should be wrapped with the trunk and the crown should be wrapped with film.

4. Generally, you can not water in winter, but if there is a long-term drought, you should pay attention to replenishing water. (Winter is also a good time to get rid of insects, pay attention to the eggs on the branches of deciduous plants, turn the soil and kill the overwintering larvae, etc.).

1. The root system is intact: before transplanting, it is necessary to ensure that the root system of the seedling is intact, and it is best to bring the soil ball to the car to transplant, so as to fully ensure the integrity of the root system of the seedling.

2. Sufficient water and nutrients: after transplanting, we should provide water and nutrients to the seedlings in time, and judge whether the seedlings are missing water and nutrients according to the state of the seedlings, and then water and fertilize. The amount of watering should be controlled well, otherwise it is easy to have too much water and the seedlings are waterlogged.

3. Pruning of branches and leaves: After transplanting, all the sunny branches and leaves should be pruned off to ensure the nutrition and water of the seedlings themselves.