What is papaya blight during papaya cultivation?

Preface: Papaya is a fruit that is often encountered in daily life. But during the cultivation of papaya, papaya blight is very easy to appear, so what is papaya blight? What measures are needed to save the day? Let's take a look! <>

1. The causes and manifestations of papaya blight are often called "water injuries" among papaya growers. The main manifestation is that the papaya has mildew due to the parasitic Phytophthora fungus, and then damages the root system of the papaya, resulting in the atrophy of the papaya's fruit, which is brownish-black, and in severe cases, it will also cause the phenomenon of fruit drop. Papaya blight often occurs after rain, because the air currents and rain generated when it rains can help spread the germ.

Second, the method of preventing papaya blight can first implement the rotation of papaya, and choose a place with high terrain and flat ground to plant papaya, and at the same time, it is also necessary to spray relevant pesticides in time to inhibit the reproduction of pests and diseases in the soil. When it rains, pay attention to draining and aerating the papaya, and spray relevant agents to form a protective film for the papaya, increase the efficacy, and prevent the spread of germs with the airflow of the rainwater and the rainwater. For papaya that has already had an epidemic, it is necessary to quickly remove the diseased strain, and at the same time burn the foreign country infected with the disease, or bury it deeply to reduce the number of pathogens, and at the same time disinfect the place of the diseased plant and the diseased fruit to reduce the spread of the disease with the air flow and rain.

3. The efficacy of papaya China's papaya is mainly planted in Guangdong, Guangxi, Fujian, Yunnan and other places, and papaya has many effects. Papaya is rich in papain, so it has a good effect on digestion and spleen. At the same time, papaya contains a lot of water, protein and a variety of vitamins, which can effectively supplement the nutrients of the human body, which is of great help to supplement the impact of the human body.

Papaya and papain contain anti-tuberculosis bacilli, so the insecticidal effect is very obvious.

Papaya blight, also known as "water injury", is papaya infected by pathogenic bacteria, atrophies and turns into brown-black and drops fruit, and finally becomes a black mummified fruit, and the pathogenic bacteria mainly damage papaya fruit and its roots.

It is because there are a large number of pathogens in the soil, and these pathogens will affect the fruit and will also affect the growth of papaya.

Papaya blight is a parasitic virus. It mainly harms papaya fruits. It can also harm the root system.

Not watering in time, and the soil is very dry, and the temperature is too high, not paying attention to some pests and diseases, and not pruning the branches and leaves in time, etc., so it will become the cause of papaya powdery mildew.

The reason is that because of the above, there are many small insect pests, and there are also insect eggs, plus there is infection, excessive fertilization, so powdery mildew appears.

There are some harmful bacteria in the soil, it is also possible that the soil is too moist, or it is possible that the temperature is too low, and these bacteria affect the growth of papaya.

It's because the wind blew some bacteria on these leaves, and the land was not sterilized at the time of planting.

Mottled yellow flower spots appear on the leaves of papaya with mosaic disease, the new leaves are densely bundled, quickly lose green and become hard and brittle, easy to break, and then do not produce new roots, do not grow new leaves, the plant grows smaller and smaller, and gradually withers and dies. Generally, diseased papaya trees are unable to flower and bear melons, and the yield is low and the quality is poor.

1. Symptoms of leaf damage: after papaya is infected with viral disease, yellow and green or dark and light green mosaic diseases appear on the young leaves, and the new leaves are densely bundled, quickly lose green and become hard and brittle, and the leaves are wrinkled and easy to break. 2. Symptoms of fruit damage:

After papaya is infected with viral disease, water-stained round spots (i.e., ring spots) appear on the skin of the fruit, and the last few round spots can be connected into irregular patches, and the melon surface has blurred ring lines, and the quality is poor. Papaya trees that are affected by viral diseases do not sprout new roots and leaves, and the plants grow smaller and smaller, and gradually wither and die.

At the beginning of the disease, water stains appear between stems, leaf veins and branches of young leaves, and then the symptoms of mosaic disease appear on young leaves, and water-stained circles (rings) also appear on the epidermis of susceptible fruits, and several circles can be combined into irregular shapes. At low temperature, most of the leaves of the diseased plants fall off, and the young leaves appear deformed.

Summary. Hello, papaya powdery mildew is a fungal disease, which will appear on the leaves, affecting the photosynthesis of the leaves.

Papaya powdery mildew affects papaya growth, what is papaya powdery mildew**?

Hello, papaya powdery mildew is a fungal disease, which will appear on the leaves, affecting the photosynthesis of the leaves.

Papaya leaves are harmed by powdery mildew, the leaves of the open finch are almost round powdery mold, white, and the later powdery mold gradually expands and connects with each other into powdery patches, most or almost all of the leaves are covered with white powdery matter, which affects photosynthesis, and the young leaves of the victim turn yellow, and even wither yellow and fall off.

Papaya leaves are harmed by powdery mildew, the leaves of the open finch are almost round powdery mold, white, and the later powdery mold gradually expands and connects with each other into powdery patches, most or almost all of the leaves are covered with white powdery matter, which affects photosynthesis, and the young leaves of the victim turn yellow, and even wither yellow and fall off.

How to make papaya leaves white**.

During the onset of powdery mildew, regularly spray 250 times of 40 colloidal sulfur suspension or 1500 times of 25 times of 25 wide rust wetting powder. It is applied from the early stage of the disease, and the pesticide is applied every 14 days for four consecutive times. Because papaya is sensitive to pesticides, it can sometimes cause new leaves to shrink slightly after application.

Is it okay to use this**.

Hello, yes**.

Give it a try. In addition, it is necessary to pay attention to scientific and reasonable planting and avoid excessive dense planting, so as to improve the ventilation and ventilation of the garden. Pruning, pruning diseased branches and dense branches, adjusting ventilation and light transmission, maintaining proper temperature and humidity in the orchard, combined with pruning, cleaning the orchard, and reducing cherry blossom scattering and less germs.

Strengthen the management of melon orchards, avoid excessive application of nitrogen fertilizer, and do a good job of drainage in the orchards.

After the autumn sowing of papaya, the cotyledons of the seedlings are generally exposed to the topsoil in 10 to 20 days, and the covered plastic film should be removed in time to avoid affecting the growth of the seedlings. At this time, bamboo pieces should be used to build an arch shed and cover it with plastic film, so as to keep warm and cold, and promote the growth of seedlings. Choose a sunny place, fertile soil, moist and well-drained place to plant, you can also use the corner of the field, hillside, in front of the house and behind the house planting, when cultivating in pieces, according to the plant row spacing of 1 m * 2 meters to open the hole, each hole is applied 5 10 kg of farm manure mixed with soil as base fertilizer.

Papaya, also known as papaya, is cultivated in areas with high temperatures and abundant rain for about a year from sowing to harvesting, and the initial harvest period will be earlier. Generally, it is better to be able to meet the above requirements. In recent years, people's living conditions have gradually improved the pursuit of fruits is getting higher and higher, cherries, papaya and other emerging fruits are countless, many fruit farmers see its market value and economic value, they began to plant papaya, the fruit is large, the fruit is many, the taste is beautiful, the first high, when the fruit is fully ripe in September, the fruit is collected from the mother plant with strong growth and resistance to stress, and the fruit after collection is spread in a cool place to dry, to prevent sunlight, to be allocated at the end of October, soaked in plant ash for 3 5h, and repeatedly scrubbed.

Choose a sunny place, fertile soil, moist and well-drained place to plant, you can also use the corner of the field, hillside, in front of the house and behind the house planting, when cultivating in pieces, according to the plant row spacing of 1 m * 2 meters to open the hole, each hole is applied 5 10 kg of farm manure mixed with soil as base fertilizer. Papaya seedlings are afraid of low temperature frost and avoid water accumulation, so it is advisable to choose a place with slightly higher terrain, good sunshine and convenient drainage and irrigation to raise seedlings. In order to prevent papaya ringspot mosaic disease, seedlings should be raised in new soil or away from the old papaya orchard, and attention should be paid to a certain distance from the melon orchard of the Cucurbitaceae family.

The end of the existing branch into the soil is cut into an inclined plane and formed into a horse ear shape, which is conducive to increasing the contact area with the soil and is conducive to water absorption; The upper cut is cut into a flat mouth at a distance of l cm from the upper bud. Soak the cuttings in clean water for a period of time before insertion.

Papaya is extremely cold-tolerant during the seedling period, and is afraid of low temperature, frost and waterlogging, so when choosing a seedling site, it is necessary to choose a place with high terrain, sufficient sunshine and good drainage and irrigation system for seedlings. And to prevent papaya ring-spot mosaic disease, so when raising seedlings, you should choose new soil or a place away from the old papaya orchard. If there is a melon orchard of the Cucurbitaceae family nearby, it is necessary to keep a certain distance from it, and the nutrition bag of the seedling is generally about 10cm in diameter and 16cm in height, and then do not open a few small holes with a diameter of about 1cm in the bag to facilitate drainage.

Under the bag, enough fully decomposed farmhouse manure should be applied as base fertilizer.

Papaya seedlings should be put some moist soil, because papaya seedlings need water, so you should get some moist soil.

Seedling cultivation: First of all, we should select the fully ripe fruits on the robust mother plant, clean the seeds after taking them out, put them into bags with good air permeability after drying, and store them in a low-temperature and dry environment. Autumn sowing is to sow the cleaned seeds directly in shallow furrows, and spring sowing is to be treated with sand storage.

After sowing, the soil should not be too thick, three times the diameter of the seeds, and too thick soil covering may lead to slow seedlings or even no seedlings. After sowing, watering to keep the soil moist, when the seedlings grow to 3 true leaves, seedlings can be thinned, when the seedlings grow to 6 true leaves, fertilizer and water management can be increased, combined with spraying fertilizer and ground drenching. In addition, in recent years, the new technology of sprout transplanting is generally welcomed, first in the nursery ground seedlings, and then transplanted to the field when the seedlings grow to 3 leaves, this seedling method emerges neatly, the lateral roots are developed, and the seedling rate is high.

Papaya is generally not cultivated in the shape of a natural heart and a round head umbrella. The natural heart shape wastes light area, increases the pressure on the branches of fruit trees, and is easy to break. There are many round-headed umbelliferous branches, and clones are vigorous, small, with little flowering and low yield, so it is necessary to actively promote stem and cup shaping when pruning the tree.

Envy. <> papaya cultivation should select good varieties for grafting when selecting seedlings, and the seedlings must be cut off before cultivation. Papaya cultivation and seedling selection should choose high-quality seedlings that have been grafted for 1-2 years, and it must be seen whether it is a good seed or a seedling. Excellent seedlings grow consistently, and the seedlings are delicate and have thorny branches.

Before planting, cut off the fibrous roots of the sapling, and then cut off a little straight root at the bottom. This favors the growth of new roots. After cutting off the fibrous roots, put the sapling into the pit, fill two-thirds of the soil, lift the sapling gently, and then smash it, water it, and fill it with soil, so that one stubble after another, the survival rate can be guaranteed to be more than 95%.

For seedlings that have been transported for many days, if there is a slight loss of water, they can be soaked in water for 6 hours before planting.

Papaya is pruned at the spring when it germinates, and new shoots are cultivated to promote high yields, and pruning can be set at 60-80 cm in the first year to promote shoot fruiting. In the second year, one third of its growth is cut off on a clamp, and in the third year, one-third of its growth is cut off, and in the fourth year, the papaya enters the full fruiting stage, and the backbone growth slows down rapidly, and the pruning can be stopped, and the tree height is 2. About 5 meters, the meristem of several backbones also grows at a rate of one-third, so that the group produces a large number of fruits, and the old branches that bear fruit for many years should be cut off in proportion every year in order to cultivate new branches and ensure a good harvest every year.

Do a detailed interpretation of the problem, I hope it will help you, if there are any questions, you can leave me a message in the comment area, you can comment with me, if there is something wrong, you can also interact with me more, if you like the author, you can also follow me, your like is the biggest help to me, thank you.

I think there are blind artificial cultivation techniques and machine cultivation techniques. And when cultivating papaya, we must choose the soil is relatively fertile and wide land, and when fertilizing, we must use farmhouse fertilizer, do not use fertilizer bought outside, and often water the plant in front of the posture, but also to prevent the occurrence of pests and diseases, if there is a situation of small insects, then we must spray insecticides in time.

To choose a good variety of good penetration, the seedlings must be cut off in advance before planting, and the fibrous roots of the seedlings should be cut off before planting, so that the letter beam can be conducive to the growth of new roots.

First of all, we should choose excellent varieties, plough the ground before planting, remove the stray and leaky grass, cut off the fibrous roots of the seedlings when planting the rotten seeds, and after planting, we must water, fertilize, prune the branches and leaves and remove insects in time.

Papaya tree characteristics.

Papaya prefers warm and humid climates, is more cold-tolerant, and is not drought-tolerant. The soil requirements are not strict, but it is suitable for growing in sunny and deep and fertile places. Papaya is a two-year-old branch with flowering, and the fruiting rate of 2 to 3-year-old stout short branches is higher.

During the flowering period, although there are more flowers, the flowers and fruits fall seriously. The seeds have dormant characteristics, and can be relieved of dormancy after 2 to 3 months of treatment under low temperature and wet conditions. The seed life span is 1 to 2 years.

Papaya seeding. Papaya is sown in autumn or spring. Autumn sowing in late October, when the papaya seeds are ripe, pick the fruit, take out the seeds, open the hole in November according to the plant row spacing of 15 cm x 20 cm, the depth of the hole is 6 cm, each hole is sown 2 3 grains, cover with fine soil 3 cm.

Spring sowing in early to late March, first put the seeds in water soaked for 2 days and then take them out, put them in a pot, cover them with a damp cloth, put them in a warm place for 24 hours, sow them according to the method, the autumn sowing people emerge in the spring of the second year, and the spring sowers emerge from late April to early May, and when the seedlings grow to about 1 meter, they can be planted in the nursery. Each hole is planted in a triangular shape 2 3 seedlings, covered with soil compaction, watering. Spring is the best time to plant trees.

Colonization. Papaya begins to flower and bear fruit after about 4 years of planting. Generally harvested in July and September, when the papaya skin is green and yellow, it should be carried out on a sunny day, and care should be taken not to hurt the fruit or attach it to the ground.