How to deal with the growing insects of Dahlia, the control of diseases and insect pests of Dahlia / 3 insect pests and 2 diseases

Dahlia is a kind of plant with high ornamental value, which can be seen in many gardens in our country. However, high ornamental plants will also wilt if there are diseases and insect pests. How to deal with the growing insects of Dahlia, and how to control the diseases and insect pests of Dahlia? Next, the editor will take you to learn about it.

1. How to deal with Dahlia worms / drug treatment

On how to deal with the problem of dahlia growing insects, first of all, you have to understand what diseases and insect pests appear, to find the cause can be targeted treatment, the most effective way is that we can choose agents for prevention and control.

II. Disease and pest control of Dahlia

1. Dahlia borer moth pest

Dahlia borer moth is the most common one in the pest control of Dahlia. the high incidence period of this pest is from August to September every year, so we must pay special attention to it at this time. This kind of pest mainly harms the stem of Dahlia and will gradually nibble away the sap of the stem, which will lead to the death of the plant if it does not come out for a long time.

Control method: this pest is the best to deal with in infancy, we can choose 50% fenitrothion emulsion 1000-1500 times to spray and control the plant as a whole.

two。 Heart-eating pest

The high incidence period of this pest is about May to June every year, which mainly harms the young leaves and hearts of dahlias, and gradually bites them, resulting in the phenomenon of plant wilting.

Control methods: when this kind of pest occurs, we must deal with it in time. We can choose to spray the plant with 1500 times of crackle parathion, usually once every 7-10 days, and we can basically eliminate this pest after 1-2 times.

3. Aphid pest

There are many plants harmed by aphids, and Dahlia is one of them. The size of this pest is very small, most of which are only about 2mm. It is difficult to detect with the naked eye and can only be judged by symptoms. This pest mainly feeds on the sap in the stem of the plant, which leads to the loss of nutrients and death of the plant.

Control methods: the emergence of this kind of pest is best to be controlled at the initial stage, if it takes a long time, it may lead to no cure. For this pest, we can use 1000 times of 50% fenitrothion emulsion to spray.

4. Root nodule disease

As the name implies, the disease mainly harms the roots of dahlias. At the beginning of the disease, a white tuberous object appears in the roots, which gradually increases in volume with the passage of the event, and finally causes the plant to wither.

Prevention and treatment: in the initial stage of finding this disease, we should remove the disease tumor in time, and then use 00 times copper sulfate solution to disinfect the wound, which can basically eliminate the disease.

5. Brown spot disease

Brown spot is a kind of fungal disease, which occurs in the growth process of many plants. This disease mainly harms the leaves of Dahlia. At the initial stage, some dark spots will appear on the leaves, which will spread gradually with the passage of the event. Finally, the leaves continue to fall off, resulting in death.

Control methods: when this disease occurs, we should spray 0.2 ~ 0.3 °be stone sulfur mixture on Dahlia in time, usually once every 7-15 days, and the disease can be thoroughly understood after 2-3 times.

The fresh and colorful summer flowers in the flower world should not only exist in cool neon clothes and fresh mountains, but also bloom in the bedroom, decorate around us, share a world with us, and create a fragrant "flower world" full of rooms. Pieces of petals and wisps of fragrance surround the body, making a pleasant and refreshing state of mind naturally present. In my spare time, carefully take care of the flowers and plants full of infinite vitality, the process of harvest is always accompanied by the optimistic spirit of self-entertainment, dull, dry and hot swept away, leaving only refreshing and fragrant.

Spend into the bedroom efficacy of multi-efficacy one: filter air in the summer room air conditioning utilization rate is very high, doors and windows are closed, air circulation will be bad. Therefore, it is appropriate to raise some flowers that can filter the air in the bedroom. Most flowers carry out photosynthesis during the day, absorb carbon dioxide, release oxygen, breathe at night, absorb oxygen and release carbon dioxide, while cactus, tile pine and other types are just the opposite. Keeping these air-filtering flowers in the same room with other flowers can effectively balance the content of indoor oxygen and carbon dioxide and keep the indoor air fresh. Efficacy 2: detoxification orchid, aloe, tiger tail orchid can absorb a large number of indoor formaldehyde and other pollutants, eliminate and prevent indoor air pollution. Especially hanging orchid, put a pot in the room, within 24 hours, its leaves will "eat" harmful gases such as carbon monoxide in the indoor air, and its effect is even better than the air filter. Milan, orchids, cloves, cactus, Tianzhu and so on can effectively purify the air. Camellia can resist the damage of harmful substances such as sulfur dioxide, and crape myrtle has strong resistance to indoor sulfur dioxide, hydrogen chloride, chlorine, hydrogen fluoride and other toxic gases. Plum has the ability to monitor the pollution of sulfur dioxide, hydrogen fluoride, hydrogen sulfide, ethylene, benzene and aldehydes in the environment. Once sulfide appears in the environment, markings will appear on its leaves, or even withered and yellow. Because flowers have these functions, the room that has just been decorated is more suitable for raising these flowers. It should be pointed out that there is a limit to these functions of plants, so it is necessary to open windows frequently to make air convection. Efficacy 3: kill germs such as rose, sweet-scented osmanthus, violet, jasmine, lemon, rose, carnation, lily of the valley, crape myrtle and other aromatic flowers with significant bactericidal effect. Crape myrtle, jasmine, lemon and other plants can kill protobacteria such as diphtheria and dysentery in 5 minutes. The fragrance of rose, carnation, lily of the valley, violet, rose and sweet-scented osmanthus has obvious inhibitory effect on the growth and culture of Mycobacterium tuberculosis, pneumococci and staphylococci. It should be noted that although flowers have a lot of benefits, do not treat the bedroom as a "greenhouse". Most flowers release carbon dioxide and absorb oxygen at night, and most of the rooms are closed at night. coupled with the carbon dioxide exhaled by the soil, the human body and pets in the flowerpot, it will increase the concentration of carbon dioxide, cause hypoxia and affect health. Experience of spending the summer on flowers: uncle Xie, 61, retired and raised flowers for 40 years. Tips: pay attention to the location. It is very important to determine the location according to your habits. Flowers can be divided into yin and yang, especially in summer according to the habits of each kind of flowers. Orchids, rhododendrons, camellias and orchids are negative and should be placed under the root of the south wall or on the balcony to the north, with enough light in the morning and evening. Rose, lotus, sweet-scented osmanthus, jasmine, orchid and so on are positive, no matter in the balcony or downstairs of the building, they should be placed in the sunny place, so that they can blossom more, smell strong and grow prosperous. Veteran florist: miss Liu, 25, a university lecturer, has been growing flowers for 5 years. Tips: timely and appropriate amount of watering. When watering flowers in summer, they should be watered in the right amount, early and late, but not at noon. And it is best to water the accumulated Rain Water, without Rain Water, you can pour tap water, but you should water the tap water for more than a day. The watering times are determined by the dry and wet of the flowerpot, and the pot soil should be dry and wet to ensure that the flower roots can breathe normally, generally watering once or twice a day. The leaf surface can also be sprayed with water properly. For acid-loving flowers, it is best to pour 0.2% to 0.3% of black alum to prevent chlorosis caused by iron deficiency. Some fleshy root flowers, such as orchids, can not stand the sun exposure, can be relatively dry at noon when spraying some water on the leaves moderately. Some of the more drought-tolerant flowers, such as cactus and crassulaceae, should drink less water, and their roots are prone to rot if there is more water. Veteran florist: Ms. Zhang, 37, a civil servant, has cultivated flowers for 14 years. Tips: pay attention to moisturizing and sunscreen. The key to growing flowers on the balcony of the building lies in the humidity, that is, moisturizing and sunscreen. The summer sun is strong, if you move the flowers indoors, it will cause their lack of sunshine and poor growth. Positive flowers are not afraid of strong sunlight, but they still need shading at noon. If it is neutral, it should be properly shaded. If it is a balcony potted flower, you can move into the room from 10:00 to 3 pm every day. If it is negative, absolutely prevent contact with strong light. It is best to set up a sunscreen for flowers, which can also prevent hail injuries at the same time. In addition, water trays are placed under flowerpots according to different varieties to ensure humidity. Veteran flower grower: Mr. Sun, a 43-year-old doctor, has grown flowers for 32 years. Tips: prevention and control of diseases and insect pests. The rainy season is the season of frequent occurrence of diseases and insect pests in potted flowers. 1000 times of 20% methyl thiophanate wettable powder or 1000 times of carbendazim wettable powder should be sprayed every half month or so to prevent diseases and insect pests. When there are aphids, red spiders, shell insects and other pests, you can spray 1000 times to 1500 times of dimethoate EC or 1500 times to 2000 times of fenpropathrin EC every 10 days. Veteran florist: granny Guo, 74, retired, raised flowers for 53 years. Tips: fertilization should be appropriate. Fertilization should be appropriate in summer. If there is too much fertilizer, the flowers can not be absorbed, thus harming the root system. Generally speaking, the flowers blooming in summer are relatively resistant to high temperature, and they can apply more fertilizer, such as crape myrtle, jasmine, impatiens, cockscomb, dahlia, etc., which can be supplemented with fertilizer during the flowering period to make it flourish; some ornamental flowers, such as kumquat and five-color pepper, can bear more fruit after topdressing phosphate fertilizer; and tropical foliage plants, such as rubber trees and tortoise bamboos, should be topdressing nitrogen fertilizer to make their leaves greener. If the concentration is too high, it is easy to cause fat injury. Experts advise flowers how to control diseases and insect pests, which is an important link in the process of flower cultivation. The solution given by experts to this problem is: 1. Detergent kills white flies. White flies not only suck the leaf juice, but also secrete mucus to wither the leaves. You can mix a spoonful of detergent with 4 liters of water, spray on the leaves and spray once every 5 minutes and 7 days until the white flies are eliminated. two。 Milk kills ticks. The stems and leaves of flowers are often accompanied by ticks, which can cause branches and leaves to change color and wither. It can be stirred with half a cup of fresh milk, 4 cups of flour and 20 liters of water, then filtered with gauze and sprayed on the branches and leaves of the flowers, killing not only ticks but also eggs. 3. Flour controls insect pests. If there are diseases and insect pests in potted flowers, you can take a small amount of flour, first rinse it into paste with cold water, then rinse it with appropriate amount of boiling water, mix it into a solution of 1 ∶ 50, and spray it on a sunny day, it will have a good effect. 4. Watermelon peel and cigarette butts can also control insects. Buckle the washed watermelon peel on the potted soil without watering for several days, which is a good nourishment for potted flowers. If you put a few cigarette butts under the peel, tar and nicotine can seep into the soil and kill many common bugs. 5. In addition, after drying the brewed tea, sprinkling it on the surface of the potted soil can also prevent flowers from growing insects. Summer flowers skillfully maintain jasmine summer is the full bloom of jasmine, sufficient water and fertilizer is conducive to flowers and leaves to flourish. Spraying foliar surface with clear water on a sunny day can obviously stimulate flowering. Orchid summer is the peak growing season of orchids, which should ensure water and nutrients. When the disease occurs, topiramate can be sprayed every 10 days. Cuckoo summer cuckoo growth is slow, in a semi-dormant state, avoid hot sun exposure and excessive fertilization, should be shaded. Water once or twice a day, and spray water to the leaf surface and the ground to moisturize and cool down. Peony avoid heat and humidity, summer plants should be placed in a ventilated and cool place, do not need too much watering, keep the basin soil moist, so as to avoid rotting roots. Rose likes fertilizer and water, so it is necessary to ensure an adequate supply of fertilizer and water, apply rotten bean cake water every half a month, and stop fertilization in mid-July. Black spot and powdery mildew are easy to occur in summer. the former is sprayed with Bordeaux solution and the latter with carbendazim every half a month. Milan likes light and heat, and Milan grows vigorously in summer. Thin alum fertilizer should be applied every 10 days before and after flowering, and water should be sprayed to the leaves frequently. The flower world is exuberant (picture)

Colorful summer flowers should not only exist in cool neon clothes and fresh mountains, but also bloom in the bedroom, decorate around us, share a world with us, and create a fragrant "flower world" full of rooms. Pieces of petals and wisps of fragrance surround the body, making a pleasant and refreshing state of mind naturally present. In my spare time, carefully take care of the flowers and plants full of infinite vitality, the process of harvest is always accompanied by the optimistic spirit of self-entertainment, dull, dry and hot swept away, leaving only refreshing and fragrant. Spend into the room has many functions: filter the air

In summer, the utilization rate of air conditioning in the room is very high, the doors and windows are closed, and the air circulation will be bad. Therefore, it is appropriate to raise some flowers that can filter the air in the bedroom. Most flowers carry out photosynthesis during the day, absorb carbon dioxide, release oxygen, breathe at night, absorb oxygen and release carbon dioxide, while cactus, tile pine and other types are just the opposite. Keeping these air-filtering flowers in the same room with other flowers can effectively balance the content of indoor oxygen and carbon dioxide and keep the indoor air fresh. Efficacy 2: detoxification

Hanging orchid, aloe, tiger tail orchid can absorb a large number of indoor formaldehyde and other pollutants, eliminate and prevent indoor air pollution. Especially hanging orchid, put a pot in the room, within 24 hours, its leaves will "eat" harmful gases such as carbon monoxide in the indoor air, and its effect is even better than the air filter. Milan, orchids, cloves, cactus, Tianzhu and so on can effectively purify the air.

Camellia can resist the damage of harmful substances such as sulfur dioxide, and crape myrtle has strong resistance to indoor sulfur dioxide, hydrogen chloride, chlorine, hydrogen fluoride and other toxic gases. Plum has the ability to monitor the pollution of sulfur dioxide, hydrogen fluoride, hydrogen sulfide, ethylene, benzene and aldehydes in the environment. Once sulfide appears in the environment, markings will appear on its leaves, or even withered and yellow.

Because flowers have these functions, the room that has just been decorated is more suitable for raising these flowers. It should be pointed out that there is a limit to these functions of plants, so it is necessary to open windows frequently to make air convection. Efficacy 3: kill germs

The volatile oil produced by rose, sweet-scented osmanthus, violet, jasmine, lemon, rose, carnation, lily of the valley, crape myrtle and other aromatic flowers has significant bactericidal effect. Crape myrtle, jasmine, lemon and other plants can kill protobacteria such as diphtheria and dysentery in 5 minutes.

The fragrance of rose, carnation, lily of the valley, violet, rose and sweet-scented osmanthus has obvious inhibitory effect on the growth and reproduction of Mycobacterium tuberculosis, pneumococci and staphylococci.

It should be noted that although flowers have a lot of benefits, do not treat the bedroom as a "greenhouse". Most flowers release carbon dioxide and absorb oxygen at night, and most of the rooms are closed at night. coupled with the carbon dioxide exhaled by the soil, the human body and pets in the flowerpot, it will increase the concentration of carbon dioxide, cause hypoxia and affect health. On the experience of Flowers spending the Summer

Veteran florist: uncle Xie, 61, retired, raised flowers for 40 years.

Tips: pay attention to the location.

It is very important to determine the location according to your habits. Flowers can be divided into yin and yang, especially in summer according to the habits of each kind of flowers. Orchids, rhododendrons, camellias and orchids are negative and should be placed under the root of the south wall or on the balcony to the north, with enough light in the morning and evening. Rose, lotus, sweet-scented osmanthus, jasmine, orchid and so on are positive, no matter in the balcony or downstairs of the building, they should be placed in the sunny place, so that they can blossom more, smell strong and grow prosperous.

Veteran florist: miss Liu, 25, a university lecturer, has been growing flowers for 5 years.

Tips: timely and appropriate amount of watering.

When watering flowers in summer, they should be watered in the right amount, early and late, but not at noon. And it is best to water the accumulated Rain Water, without Rain Water, you can pour tap water, but you should water the tap water for more than a day. The watering times are determined by the dry and wet of the flowerpot, and the pot soil should be dry and wet to ensure that the flower roots can breathe normally, generally watering once or twice a day. The leaf surface can also be sprayed with water properly. For acid-loving flowers, it is best to pour 0.2% to 0.3% of black alum to prevent chlorosis caused by iron deficiency. Some fleshy root flowers, such as orchids, can not stand the sun exposure, can be relatively dry at noon when spraying some water on the leaves moderately. Some of the more drought-tolerant flowers, such as cactus and crassulaceae, should drink less water, and their roots are prone to rot if there is more water.

Veteran florist: Ms. Zhang, 37, a civil servant, has cultivated flowers for 14 years.

Tips: pay attention to moisturizing and sunscreen.

The key to growing flowers on the balcony of the building lies in the humidity, that is, moisturizing and sunscreen. The summer sun is strong, if you move the flowers indoors, it will cause their lack of sunshine and poor growth. Positive flowers are not afraid of strong sunlight, but they still need shading at noon. If it is neutral, it should be properly shaded. If it is a balcony potted flower, you can move into the room from 10:00 to 3 pm every day. If it is negative, absolutely prevent contact with strong light. It is best to set up a sunscreen for flowers, which can also prevent hail injuries at the same time. In addition, water trays are placed under flowerpots according to different varieties to ensure humidity.

Veteran flower grower: Mr. Sun, a 43-year-old doctor, has grown flowers for 32 years.

Tips: prevention and control of diseases and insect pests.

The rainy season is the season of frequent occurrence of diseases and insect pests in potted flowers. 1000 times of 20% methyl thiophanate wettable powder or 1000 times of carbendazim wettable powder should be sprayed every half month or so to prevent diseases and insect pests. When there are aphids, red spiders, shell insects and other pests, you can spray 1000 times to 1500 times of dimethoate EC or 1500 times to 2000 times of fenpropathrin EC every 10 days.

Veteran florist: granny Guo, 74, retired, raised flowers for 53 years.

Tips: fertilization should be appropriate.

Fertilization should be appropriate in summer. If there is too much fertilizer, the flowers can not be absorbed, thus harming the root system. Generally speaking, the flowers blooming in summer are relatively resistant to high temperature, and they can apply more fertilizer, such as crape myrtle, jasmine, impatiens, cockscomb, dahlia, etc., which can be supplemented with fertilizer during the flowering period to make it flourish; some ornamental flowers, such as kumquat and five-color pepper, can bear more fruit after topdressing phosphate fertilizer; and tropical foliage plants, such as rubber trees and tortoise bamboos, should be topdressing nitrogen fertilizer to make their leaves greener. If the concentration is too high, it is easy to cause fat injury. Experts advise flowers on how to prevent diseases and insect pests

The prevention and control of diseases and insect pests is an important link in the process of flower cultivation. The solution given by experts to this problem is:

1. Detergent kills white flies. White flies not only suck the leaf juice, but also secrete mucus to wither the leaves. You can mix a spoonful of detergent with 4 liters of water, spray on the leaves and spray once every 5 minutes and 7 days until the white flies are eliminated.

two。 Milk kills ticks. The stems and leaves of flowers are often accompanied by ticks, which can cause branches and leaves to change color and wither. It can be stirred with half a cup of fresh milk, 4 cups of flour and 20 liters of water, then filtered with gauze and sprayed on the branches and leaves of the flowers, killing not only ticks but also eggs.

3. Flour controls insect pests. If there are diseases and insect pests in potted flowers, you can take a small amount of flour, first rinse it into paste with cold water, then rinse it with appropriate amount of boiling water, mix it into a solution of 1 ∶ 50, and spray it on a sunny day, it will have a good effect.

4. Watermelon peel and cigarette butts can also control insects. Buckle the washed watermelon peel on the potted soil without watering for several days, which is a good nourishment for potted flowers. If you put a few cigarette butts under the peel, tar and nicotine can seep into the soil and kill many common bugs.

5. In addition, after drying the brewed tea, sprinkling it on the surface of the potted soil can also prevent flowers from growing insects.

Skillful maintenance of flowers in summer

Jasmine summer is the full bloom of jasmine, sufficient water and fertilizer is conducive to blooming and leafy. Spraying foliar surface with clear water on a sunny day can obviously stimulate flowering.

Orchid summer is the peak growing season of orchids, which should ensure water and nutrients. When the disease occurs, topiramate can be sprayed every 10 days.

Cuckoo summer cuckoo growth is slow, in a semi-dormant state, avoid hot sun exposure and excessive fertilization, should be shaded. Water once or twice a day, and spray water to the leaf surface and the ground to moisturize and cool down.

Peony avoid heat and humidity, summer plants should be placed in a ventilated and cool place, do not need too much watering, keep the basin soil moist, so as to avoid rotting roots.

Rose likes fertilizer and water, so it is necessary to ensure an adequate supply of fertilizer and water, apply rotten bean cake water every half a month, and stop fertilization in mid-July. Black spot and powdery mildew are easy to occur in summer. the former is sprayed with Bordeaux solution and the latter with carbendazim every half a month.

Milan likes light and heat, and Milan grows vigorously in summer. Thin alum fertilizer should be applied every 10 days before and after flowering, and water should be sprayed to the leaves frequently.