Impatiens likes sunshine, is afraid of humidity, is heat-resistant and cold-resistant, and is suitable for growing in loose, fertile and slightly acidic soil, and is also barren-resistant. Transplantation is easy to survive and grow rapidly. When potted, seedlings can be transplanted when they grow 3-4 leaves. First, use a small-caliber pot, gradually change it into a larger pot, and finally plant it in a large pot with a diameter of 20 cm. Liquid fertilizer should be applied after 10 and every other week thereafter. After planting, the main stem of the plant should be topped to enhance its branching ability; Picking the basal flowers at any time will promote each branch to blossom one after another.

Impatiens balsamina has strong viability, good adaptability and few general diseases and insect pests. If the temperature is high and the humidity is high, 500 times of 50% thiophanate-methyl wettable powder can prevent powdery mildew. In case of leaf spot, 50% carbendazim wettable powder with 500 times solution can be used for control. The main pest of Impatiens balsamina is red moth, and its larvae will eat the leaves of Impatiens balsamina. If this pest is found, it can be captured and killed manually.

How to raise impatiens

Impatiens is native to Panicum in Indian, Malaysian and southern China. Plant height is 30-80 cm. The stems are succulent, the nodes are enlarged, the leaves are narrow or wide lanceolate, and the edges are sharp and alternate. Flowers are axillary, with short pedicels, solitary or clustered, and the colors are purple, vermilion, white, pink or variegated. Flowering from June to August. Sepals are 3 pieces, one on each side, one on the back is large and petal-shaped, with 5 petals at the base, and 4 lateral sepals are spread out, and they are 2-lobed in pairs to form a flying phoenix shape. Capsule spindle-shaped, spherical seeds, discharged after maturity. There are many varieties of impatiens, such as single, double, rose, camellia and Dianthus. Plant types have branches extending straight up, some are more developed, and some are especially dragon-shaped. There are short stems with a plant height of 20-30 cm, middle stems with a plant height of 40-60 cm and high stems with a plant height of more than 80 cm.

Impatiens grow sturdily, like heat but afraid of cold, have strong adaptability to soil, and like moist and well-drained soil. Self-seeding and reproduction. Reproduce with seeds. Sow in late March to early April, and transplant once after emergence. The seedlings can be planted with a height of 8 cm and a spacing of 30 cm. Strengthen management and control pests and diseases after planting. Seed collection and reproduction should adhere to optimization, otherwise it is easy to degenerate. When picking seeds, you can put a paper bag on the fruit stalk first, then cut it off and let the bullets fall into the paper bag.

Impatiens can be used as flower beds, glasses or potted plants; It can also be used for gap greening.

The flowering period of Impatiens balsamina is controlled by sowing date. It blooms from June to August in late March, from July to September in late April, and from late May to early June.

There are three kinds of impatiens with high ornamental value, namely ho Impatiens, Sultan Impatiens and Fu Ba Impatiens.

Plant height 15-50 cm, alternate lanceolate leaves with various bright colors. Flowers are axillary, with a distance, beautiful and lovely colors, bright flowers and leaves, and high ornamental value. The flowering period is extremely long, and flowers can be seen almost all year round, but they bloom in spring, autumn and winter, and are shade-tolerant, which is suitable for flower bed cultivation or potted plants with insufficient sunshine.

Because it is not easy to bear fruit, cutting propagation is adopted, and cutting in spring or autumn is appropriate. Cut fat branches, each about 6-8 cm long, and plant them in a well-drained sand bed or fine snake sawdust. Keep proper humidity, and roots will grow in about 20 days. When the roots grow vigorously, transplant them into potted plants or flower beds.

It is best to plant sandy loam with rich organic matter, which has good drainage and poor drainage, and the thick and watery stems and branches are easy to rot. Adapt to about 50-70% sunlight and avoid strong direct sunlight, but you can directly get soft sunlight in spring, and if it is too dark, it will easily grow white and have poor fertility. After the seedlings are planted, if there are few branches, they can be pitted to promote more branches and dwarf the plants. Fertilize 1 time a month, and ternary or organic fertilizers such as bean cake water and oil meal are good. Sexual preference is warm, and the suitable reproductive temperature is 15-25 degrees. The rainy season or high temperature and humidity in spring and summer in this province are fatal injuries to growth, and long-term rain can easily lead to stem rot. The high temperature in summer is not suitable for direct sunlight, so the branches should be cut short, shaded and ventilated in summer, and the temperature will turn cool in autumn, and then topdressing should be carried out at the peak of growth. It is best to regenerate and propagate the old plants that are more than 2 years old.

(1) We know that the conditions of seeds themselves are complete and vigorous embryos and nutrients needed for embryo development. Therefore, when selecting seeds, choose complete seeds and live seeds, which has passed the dormancy period. (2) Use a clay pot with a small hole at the bottom, because this flowerpot is easily permeable to water and air. It can ensure that seeds have enough air when they germinate and that roots can breathe when they grow into seedlings. To germinate, seeds must meet certain external conditions such as moisture, suitable temperature and sufficient air. (3) After about two weeks, the bud will break through the ground, and the bud will develop from the germ of the seed. (4) Petals can protect stamens before opening. Beautiful flowers, flowers and nectar can attract insects to pollinate. (5) It is necessary to prolong the life of seeds as much as possible, so low-temperature drying is beneficial to prolong the life of seeds. So the answer is: (1) seeds that are alive, dormant, full and have good embryos. (The conditions for seed germination are: fullness, integrity, being out of dormancy and being alive) (2) being able to breathe and drain water; Certain moisture, suitable temperature and sufficient air (3) germ; (4) Reproduction (protecting stamens and attracting insects to pollinate). (5) low-temperature drying. Preserving seeds should not only keep their vitality, but also inhibit their respiration.

How to raise impatiens?

Impatiens, also known as henna, dyed henna, pink and so on.

Because its flower head, wings, tail and feet are all like a phoenix, it is also called Jin Fenghua. Impatiens balsamina is an annual herbaceous flower of Impatiens family, which is produced in China and India.

& gt Impatiens' Habits Impatiens love sunshine, are afraid of humidity, are heat-resistant and not cold-resistant, and are suitable for loose, fertile and slightly acidic soil, but they are also barren. Impatiens balsamina has strong adaptability, easy survival and rapid growth after transplantation.

& gt propagation of impatiens balsamina is propagated by seeds. Sowing should be carried out from March to September, especially in April. Before sowing, the seedbed should be watered to keep it moist. The seeds of impatiens balsamina are so small that they can't be watered immediately after sowing, lest they be washed away.

Cover with a thin layer of soil about 3-4 mm, and pay attention to shading. After about 10 days, the seedlings can emerge. When the seedlings grow 2-3 leaves, they should be transplanted at any time, and then gradually planted or potted.

Germination can also be cultivated in greenhouse, but before planting outdoors, seedlings must be thinned at night. 1. Sowing and sowing time are generally in spring and autumn. The ambient temperature is 22~26℃ and the humidity is 50~85%. Sow when the light is sufficient, but arrange the substrate in advance, and it should be flat and fine to avoid "eating seeds".

Soak the seedbed substrate thoroughly with enough water, after the water is completely soaked, spread the seeds evenly, then cover them with fine sand or vermiculite with a thickness of 0.5-0.8 cm, and germinate in 5-6 days. Second, maintenance and seedling protection: the substrate in cotyledon stage should be kept moist and not dry, but it should not be too wet and waterlogged to avoid "collapse".

Water should be controlled at the true leaf stage, and the substrate surface should be dry before watering. After the primary true leaves are unfolded, they can be transplanted. Of course, if you plant a small amount, you can plant it directly, which is more conducive to root health and does not need transplantation. Maintenance of seedlings: water them before transplanting, and then transplant them with clods. When transplanting, the planting depth should be at the original depth or a little deeper, and water should be poured immediately. When planting in summer, it should be properly shaded for a few days, and it can be maintained normally after one week. If it is not dry, there is no need to water it. After two real leaves grow, they can be watered with a small amount of fertilizer to promote growth. Fertilization should be comprehensive and nutritious in order to get more and bigger flowers.

The growth period of impatiens balsamina is from April to September. Generally speaking, seeds germinate and grow leaves about a week after sowing in flowerpots. When the seeds grow to about 8cm, 65,438+0-3 plants should be raised in each pot. When the seeds grow to 20-30 cm, the stems of the plants should be topped to enhance the branching ability. After five leaves, they should be decomposed once every half month. Water once a day during the growing period and twice a day in hot summer. Pay attention to drainage in rainy days. In short, don't dry the soil and don't accumulate water.

Third, pest control Impatiens have strong viability and good adaptability, and there are few general pests and diseases. If the temperature is high and the humidity is high, spraying 800 times of 50% thiophanate-methyl wettable powder can prevent powdery mildew.

In case of leaf spot, 50% carbendazim wettable powder with 500 times solution can be used for control. The main pest of Impatiens balsamina is red moth, and its larvae will eat the leaves of Impatiens balsamina.

If this pest is found, it can be captured and killed manually. Impatiens like sunny terrain and loose and fertile soil, and can also grow in relatively poor soil.

Fourth, post-flowering management: after flowering, the stems are cut off, and the flowers are more prosperous without seeds; Picking the basal flowers at any time will promote the top of each branch to blossom one after another, but it is easy to mutate. It can bloom in the first half of June and last for more than two months.

Verb (abbreviation of verb) Seed-collecting Impatiens Seed-collecting: Because the fruit of Impatiens will bounce and scatter seeds in all directions, it belongs to mechanical seed-sowing, so flower lovers can find seeds at or near the bottom of the basin if they want to collect them, or harvest them before they bounce. References:

Yuhua Valley/Herb/20111023/1717.

How to raise impatiens

Planting techniques: Plant overview Annual erect succulent herbs, also known as henna, dyed henna, pink, etc.

Because its flower head, wings, tail and feet are all like a phoenix, it is also called Jin Fenghua. Impatiens balsamina is an annual herbaceous flower of Impatiens family, which is native to China, India and Myanmar.

Morphological characteristics Impatiens balsamina stems are 40- 100 cm high, fleshy, stout and erect. Upper branches, pilose or suborbicular.

Leaves alternate, wide or narrowly lanceolate, about 10 cm long, with sharp tips, sharp teeth at the edges and wedge-shaped base; There are several pairs of glands near the petiole. Its flowers are shaped like butterflies, and the colors are pink, scarlet, purple, white, yellow and sprinkled with gold. They are good at mutation.

Some varieties can have several colors of flowers on the same plant. Impatiens have many single petals, and the double petals are called impatiens bulbs.

According to the ancient flower spectrum, there are more than 200 varieties of impatiens, many of which have been lost. Because impatiens is good at variation, after artificial cultivation and selection, some good varieties have been produced, such as five-color head phoenix, peanut stem top, colorful big flowers and ten kinds of brocade.

According to different flower patterns, it can be divided into rose type, camellia type and Dianthus type. Impatiens bloom from June to August, bearing capsules, spindle-shaped and white hairs. When it matures, it will bite into five twisted fruit petals. Most seeds are spherical, black and peach-shaped. When they mature, their shells will burst and the seeds will eject and reproduce themselves. Therefore, it is very necessary to collect seeds in time.

Habits and characteristics Impatiens love sunshine, are afraid of humidity, are heat-resistant and not cold-resistant, and are suitable for growing in loose, fertile and slightly acidic soil, but they are also barren. Impatiens balsamina has strong adaptability, easy survival and rapid growth after transplantation.

Water once a day during the growing period and twice a day in hot summer. Pay attention to drainage in rainy days. In short, don't dry the soil and don't accumulate water. Impatiens balsamina has strong viability, good adaptability and few general diseases and insect pests.

If the temperature is high and the humidity is high, spraying 800 times of 50% thiophanate-methyl wettable powder can prevent powdery mildew. In case of leaf spot, 50% carbendazim wettable powder with 500 times solution can be used for control.

The main pest of Impatiens balsamina is red moth, and its larvae will eat the leaves of Impatiens balsamina. If this pest is found, it can be captured and killed manually.

Breeding sunny terrain and loose fertile soil can also grow in poorer soil. Reproduce with seeds.

Sowing is carried out from March to September, April is the most suitable sowing time, and the transplanting time is not arbitrary. The growth period is from April to September, and the seeds germinate and grow leaves about one week after sowing in the pot.

When it grows to about 8cm, 1-3 plants are cultivated in each pot. When it grows to 20-30 cm, pick the core, and after planting, top the main stem of the plant to enhance its branching ability and plump plant shape.

After five leaves, apply decomposed dilute human excrement and urine every half month, and apply phosphate fertilizer and plant ash before and after pregnancy. After bloom, cut off the pedicel and don't let it seed, then the flower will bloom more vigorously; Picking the basal flowers at any time will promote each branch to blossom one after another.

It can bloom in the first half of June and last for more than two months. Before sowing, the seedbed should be watered to keep it moist. Phoenix seeds are small, so you can't water them immediately after sowing, so as not to wash them away.

Cover with a thin layer of soil about 3-4 mm, and pay attention to shading. After about 10 days, the seedlings can emerge. When the seedlings grow 2-3 leaves, they should be transplanted and then planted step by step or cultivated in pots.

Germination can also be cultivated in greenhouse, but before planting outdoors, seedlings should be strengthened at night. Seeds of Impatiens balsamina seedling-raising technology are sown on the culture soil, lightly covered with 0.3 cm, and germinated after 5-6 days. 3-4 true leaves can be planted in flowerpots or flower beds with a spacing of 30 cm.

Disease control. Powdery Mildew of Impatiens A. Symptoms: The disease mainly occurs on leaves and shoots. Generally, it begins in June, and leaves are covered with white powder after July.

Subsequently, small yellow spots were formed in the white powder layer, which gradually became darker and finally became dark brown. B. Transmission route: the pathogen overwinters in the residues and seeds of diseased plants.

In the second year, the environment is suitable, and germs spread through wind and rain. August to September is the peak of the disease.

C. control method: 1. Don't plant too densely, properly ventilate, strengthen fertilizer and water management, and enhance plant disease resistance. Remove diseased leaves and plants, destroy them centrally, and reduce the source of infection.

2. Use 15% triadimefon wettable powder 1000~ 1200 times solution or 70% thiophanate-methyl wettable powder 1000 times solution for control. Avoid spraying at high temperature above 32℃ to avoid phytotoxicity.

2. Impatiens brown spot disease. Impatiens brown spot, also known as Impatiens leaf spot, occurs all over China. A. symptoms: diseases mainly occur on leaves.

At first, the diseased spots on the leaves are small yellow-brown spots, then they expand into circles or ellipses, and then turn into light brown at the center, with brown edges and inconspicuous wheel lines. On the seriously ill leaves, the diseased spots are contiguous, causing the leaves to turn yellow until the plants die.

B. Transmission route: The pathogen overwinters on Impatiens remnants and soil plant fragments. In the next year, when the environmental conditions are suitable, the bacteria will spread through the wind and rain.

It is easy to get sick in hot and rainy season. C. Control methods 1 Impatiens like fertile sandy loam and are not tolerant to waterlogging.

Therefore, sandy loam should be planted to facilitate drainage; Potted impatiens should be watered in time after the rain. At the end of autumn, we should focus on destroying diseased leaves and plants to reduce the source of infection in the coming year.

2. Use 25% carbendazim wettable powder 300~600 times, 50% thiophanate-methyl 100 times or 75% chlorothalonil 1000 times to control the disease at the early stage. Third, Impatiens damping-off disease A. Symptoms: Pathogens mainly infect rhizomes, and the diseased parts turn black or shrink. White mold will grow on it when it is wet. After the plant is infected, the leaves wither and dry within a few days, and then the whole plant dies.

B. Transmission route: 1. It mainly overwinters in soil or diseased residue in the form of mycelium or sclerotia, and the mycelium in soil saprophytes and does not sleep. 2. In the field, infection mainly depends on contact, that is, the roots, stems and leaves of plants will be infected by hyphae in the soil when they come into contact with the diseased soil. Under the condition of water film, healthy leaves will get sick when they come into contact with the diseased parts.

In addition, seeds, farm tools and compost containing bacteria can also spread the disease. C prevention and treatment method: at the initial stage of the disease, spray 75% chlorothalonil wettable powder 600 times, or 60% Dover wettable powder 500 times and 20% methyl chloropicrin EC 1200 times.

References:

baike.baidu/view/7008。

How to cultivate impatiens, cultivation methods and matters needing attention.

1. Land selection and soil preparation: Impatiens balsamina should be planted in soil with water and fertilizer conservation, moist soil, fertile soil, sufficient sunshine and good drainage. At the same time, base fertilizer should be applied in time and soil preparation should be carried out, and the width of the border can be1.2m. ..

2. Sowing: Impatiens can be broadcast live because of their small planting and long life, and March in the south is suitable for live broadcast; Direct seeding can be carried out in April in the north. When planting, it should be evenly planted in ditches, covered with soil in time, and then watered in time, which is beneficial to the growth of Impatiens balsamina seeds. After planting impatiens balsamina, the soil should be kept moist, the growth temperature is generally 25℃, and seedlings begin to emerge in about 5 days. Impatiens generally use 500 grams of seeds per 667 square meters. Proper honey juice can make impatiens high quality and high yield.

3. Seedling raising: Seed Impatiens balsamina is sown on the culture soil, and it can germinate after 5-6 days by gently covering the soil by 0.3 cm. It is understood that true leaves are generally planted in flowerpots with 3-4 leaves.

4. Flowering period: It is understood that if the flowering period of impatiens is delayed, it can be planted in early July; You can also use the method of removing the core, and at the same time remove the flowers and buds that bloom early in time, so that the plants will continue to expand. Topdressing in general 15-20 days 1 time. Impatiens usually form more buds at the end of September.

5. management. In order to prevent weeds from grabbing water after impatiens emerges, it is necessary to loosen the soil and weed in time, and water it in time during drought. When the height of impatiens balsamina seedlings is 30-40 cm, the old leaves at the lower part of the stem should be removed in time, and the top should be removed to make it more branched. Impatiens should be fertilized with cake fertilizer of 40kg per mu, and the fertilizer should be sprinkled in the ditch and watered in time, which is beneficial for Impatiens to bloom.

Matters needing attention of Impatiens balsamina:

After planting impatiens balsamina, the main stem of the plant should be topped to enhance its branching ability. After the base of impatiens blooms, it should be picked in time to facilitate the top of each branch to blossom one after another. Impatiens should be watered in time, soaked in water in the morning and replenished at night, and sprayed with water around the leaves to avoid being too dry or wet. Impatiens generally have few pests and diseases. If the temperature is high, powdery mildew is easy to appear. Spray 800 times of 50% thiophanate-methyl wettable powder in time to facilitate the normal growth of Impatiens balsamina.

How does impatiens raise undyed henna?

Is your Impatiens New Guinea Impatiens or African Impatiens?

The two kinds of impatiens have different needs for light and water.

Impatiens of New Guinea:

The light needs to be sufficient, and it can also be slightly resistant to semi-shade.

The temperature is between 20~30℃ and the humidity is between 50~80%.

Watering should alternate between wet and dry to avoid wet waterlogging, and every time the surface of the basin soil is dry, it should be watered thoroughly.

Fertilize a little more, so that the flowers will keep blooming.

Impatiens africana:

Good light is enough, it can be tolerated in winter and must be shaded in summer.

Temperature 15~25℃ and humidity 50~90%.

Water both wet and dry, and water the topsoil when it is dry, for fear of drought.

Fertilization should also be less and diligent, for fear of hypertrophy.

How to raise impatiens?

Planting essentials: 1 Before and after sowing in Tomb-Sweeping Day, no soil is covered after sowing, and the film is covered to keep warm to prevent cold in spring; 2. Sex likes warm and sufficient light, is not cold-resistant, avoids exposure to the hot sun, likes humidity and fears drought, and avoids waterlogging.

When the water is insufficient, it is easy to fall flowers and leaves. Strong adaptability to soil.

3. Germination soil temperature: 22-25℃ Germination days: 5-8 days Optimum growth temperature: 16-22℃ From sowing to flowering: 60-70 days. Now most of the flower markets are impatiens in New Guinea. Impatiens of New Guinea is a perennial evergreen herb of Impatiens of Impatiens family.

Rich in color, bright and cheerful in color, blooming in all seasons, flourishing in flowers and long in flowering period; The plant is plump, the leaves are clean and beautiful, and the leaf color and shape are unique; It grows fast, can be naturally shaped, and is suitable for the annual supply of fashionable potted flowers. Growth conditions of impatiens balsamina: the ideal vegetative growth temperature is 22℃~25℃ during the day and 20℃ ~ 21℃ at night; After 5 weeks, the daytime temperature of tall plants is 24℃~26℃, the nighttime temperature is 65438 08℃, the daytime temperature of compact plants is 20℃ ~ 265438 0℃, and the nighttime temperature is 65438 08℃. The night temperature of 65438 08℃ is the ideal temperature for flower differentiation and development, especially under the condition of weak light. When the daytime temperature exceeds 28℃~29℃, it should be shaded, otherwise the flowers will shrink.

The temperature below 15℃ or above 32℃ will affect the normal growth. It needs plenty of light, but it needs to block out strong light in summer.

Cultivation techniques: the finished flowers are generally planted in flowerpots of 10~ 15cm; The matrix should be loose, breathable and have certain water retention. Very sensitive to salt damage, it is appropriate to apply thin fertilizer often.

Avoid watering too much or drought. The optimum PH value is 5.8~6.5.

In order to make plants plump, we should remove the core and shape them. Seeding in mid-April, the seedlings grow faster. Generally, after transplanting once, they should be planted in the open field with a spacing of 30-40CM, and should be watered in time in dry season.

Flowering in mid-July, the flowering period is 40-50 days. After bloom, topdressing should be done once. June 65438+1 October1If flowers are used, they can be planted in late July.

Fertilize and water: use 50~ 100ppm nitrogen fertilizer in the first three weeks, and use 100ppm nitrogen fertilizer in the last three weeks, then fertilize according to soil analysis and water once every two weeks to avoid salt damage. Twisted, dark green and curly leaves are signals of high salt content, and the application of slow-release fertilizers and micro-fertilizers often leads to poisoning. Pest control: the main diseases are botrytis cinerea, pythium, Rhizoctonia solani and powdery mildew. Low salt and proper irrigation can avoid pythium.

Insect pests: always pay attention to the prevention and control of thrips, spiders (curly growth points) and fungal mosquitoes before flowering, otherwise the application of pesticides during flowering will affect the development of flowers. Fungal mosquitoes can be prevented by irrigating the roots with 35 ounces/100 gallons of medicine. Symptoms of powdery mildew of Impatiens balsamina The disease mainly occurs on leaves and shoots.

Generally, it begins in June, and leaves are covered with white powder after July. Subsequently, small yellow spots were formed in the white powder layer, which gradually became darker and finally became dark brown.

Transmission route pathogens overwinter in the residues and seeds of diseased plants. In the second year, the environment is suitable, and germs spread through wind and rain.

August to September is the peak of the disease. Control method 1. Don't plant too densely, properly ventilate, strengthen fertilizer and water management, and enhance plant disease resistance.

Remove diseased leaves and plants, destroy them centrally, and reduce the source of infection. 2. Use 15% triadimefon wettable powder 1000~ 1200 times solution or 70% thiophanate-methyl wettable powder 1000 times solution for control.

Avoid spraying at high temperature above 32℃ to avoid phytotoxicity. 2. Impatiens brown spot disease. Impatiens brown spot, also known as Impatiens leaf spot, occurs all over China.

Symptomatic diseases mainly occur in leaves. At first, the diseased spots on the leaves are small yellow-brown spots, then they expand into circles or ellipses, and then turn into light brown at the center, with brown edges and inconspicuous wheel lines.

On the seriously ill leaves, the diseased spots are contiguous, causing the leaves to turn yellow until the plants die. The transmission route of bacteria overwinters on Impatiens remnants and soil plant fragments.

In the next year, when the environmental conditions are suitable, the bacteria will spread through the wind and rain. It is easy to get sick in hot and rainy season.

Control method 1 impatiens likes fertile sandy loam and is not tolerant to waterlogging. Therefore, sandy loam should be planted to facilitate drainage; Potted impatiens should be watered in time after the rain.

At the end of autumn, we should focus on destroying diseased leaves and plants to reduce the source of infection in the coming year. 2. Use 25% carbendazim wettable powder 300~600 times, 50% thiophanate-methyl 100 times or 75% chlorothalonil 1000 times to control the disease at the early stage.

Third, the symptoms of Impatiens damping-off mainly infect the rhizome, and the diseased part turns black or atrophy. White mold will grow on it when it is wet. After the plant is infected, the leaves will wither and dry within a few days, which will lead to the death of the whole plant. The transmission path is 1. It mainly overwinters in soil or diseased body in the form of mycelium or sclerotia, and the mycelium in soil is saprophytic without dormancy.

2. In the field, infection is mainly caused by contact, that is, when roots, stems and leaves of plants come into contact with diseased soil, they will be infected by hyphae in the soil. Under the condition of water film, healthy leaves that come into contact with the diseased parts will get sick. In addition, seeds, farm tools and compost containing bacteria can also spread the disease.

Prevention and treatment: Spraying 600 times of 75% chlorothalonil wettable powder, or 500 times of 60% Dover wettable powder and 20% methylprednisolone EC 1200 times at the initial stage of the disease. Fourth, the symptoms of impatiens wilt occur in the rhizome.

At first, it turns brown and shrinks at the roots, and then it causes the symptoms of withering. Generally, flower beds have more diseases in rainy season and when potted plants are too wet.

Transmission route and pathogenic conditions: the pathogen overwinters in the form of seeds or mycelium and oospores with diseased residues in the soil, and spreads through wind, rain and irrigation water. Pathogens infect seedlings and cause lodging. Adult stage, due to heavy rain and high humidity, easy to get sick. The optimum temperature for pathogen development is 27℃ ~ 365,438+0℃, the highest temperature is 36℃, and the lowest temperature is 65,438+00℃. When the continuous cropping area is rainy or wet, or the soil is sticky, the terrain is low and the disease is serious.

Control method 1. Remove diseased leaves; Increase the application amount of phosphorus and potassium fertilizer. 2. Spraying 75% chlorothalonil wettable powder 500-600 times, or 40% foscarnet aluminum (ethyl aluminum phosphate) wettable powder 200 times, 70% foscarnet manganese zinc wettable powder 500 times, 58% metalaxyl manganese zinc 400-500 times, and 72.2% Pluronic water solution 700-800 times at the initial stage of the disease.

The main problems in cultivation are delayed flowering or non-flowering: insufficient light, too high night temperature (above 20℃) and too high nitrogen fertilizer consumption, which often coexist; No rooting or initial growth, root rot, too wet substrate, and often low temperature (below 20℃), sometimes too high salt content; If only some plants don't grow,

How to raise impatiens before it blooms?

Impatiens are strong and easy to grow.

First of all, we must ensure sufficient sunshine throughout the growth cycle.

Secondly, when sowing, water should be poured first, then the seeds of Impatiens balsamina should be spread evenly, and then covered with a thin layer of sand or vermiculite (thickness is 1 cm), so as to keep it moist and not dry! Control watering until the seedlings are all together, do not keep wet, and adopt the principle of dry soil surface before watering.

Thirdly, when the seedlings grow to 2 14 true leaves, they should be transplanted and planted in time. If the seedlings are planted in the target flowerpot, only the weak seedlings and the seedlings on the side can be removed at this time, and only the 1-3 plants in the middle of the pot (small pot 1 plant, large pot 2 13 plants, because the plants of impatiens are not small, try not to plant too many plants in one pot! )

When transplanting and planting, a small amount of compound fertilizer can be applied in the hole, once in the next half month (if the soil is fertile, it can only be applied 1-2 times).

Finally, powdery mildew must be prevented in rainy season, because it is the most common disease of impatiens. It is best to spray 50% carbendazim wettable powder with 1000 times solution once every half month in rainy season to prevent it from becoming a major disease!

There is not much else to pay attention to, because impatiens has fewer pests and diseases.