What kind of insect does a dragon s blood tree have yellow spots on the back of its leaves?

Dracaena. Common insect pests include spider mites.

After being damaged, the leaves will fade, the chlorophyll will be damaged, and dense small yellow spots and small yellow spots will appear on the surface, which can be sprayed with 20% trichlorodiol emulsion, adding 800-1000 times of water, and making a solution; In case of encountering scale insects.

It will lead to poor growth, and can be sprayed with 800-1000 times of rapid culling.

Manifestations of spider mite.

Due to the dry environment, dragon's blood trees are placed on balconies or indoor windowsills for a long time to grow, and red spiders are easy to grow. Spider mites, commonly known as fire dragons, belong to mite pests, mostly clustered on the back of plant leaves, build web bunkers, and sting sap.

The dracaena is harmed by red spiders, the leaves fade, the chlorophyll is damaged, and dense small yellow spots and small yellow spots appear on the surface, and gradually shrink, yellow, wither, and fall off in severe cases, losing its due ornamental value.

Prevention and control methods: Spider mites often hide on the back of branches, leaves or dense places, pull the net to hide, and it is easier to catch manually.

If it is treated with chemical agents, 20% trichlorodiol emulsion can be used, 800-1000 times of water can be added to make a solution and sprayed, this drug is suitable for adults and nymphs.

and eggs have a good killing effect. 50% dichlorvos can also be used.

The emulsion is added with 1000-1500 times water to make a solution and sprayed.

When spraying, it is necessary to pay attention to the back of the blade should also be sprayed, so that the killing effect is better.

Manifestations of scale worm disease.

The damage is widespread, sucking the sap of stems and leaves, resulting in poor plant growth, and even inducing coal stain disease, resulting in large-scale damage to the leaves. It has an earlier prevalence than spider mites and often breeds in large numbers in early spring.

Prevention and control method: When the number is small, it can be removed with a brush. In addition, it can also be sprayed with 800-1000 times the liquid of rapid culling. in the culture soil.

Mixed with a certain amount of trim water-soluble fertilizer has a preventive effect.

Whether it is a red spider or a scale insect, it is a very annoying insect pest, and it is necessary to check it frequently to find spider silk on weekdays.

and powdery mildew, it is necessary to check whether there are insects on the front and back of the leaves in time, and the early insect pests are easy to control.

Dracaena trees are prone to scale insects.

When the quantity is small, it can be brushed with a brush, or it can be sprayed with insect medicine to prevent and control.

Summary. Dracaena 2019-06-11 22:21:

27 scale insects, the sap of the dracaena tree is known as the holy medicine of blood, but it is also one of the favorite "food" of many pests, such as scale insects will invade the dragon's blood tree, hide on its leaves and suck the sap inside, the leaves will grow poorly after being sucked, and the leaves of the dragon's blood tree are yellow and have small black bugs.

Dracaena opens its eyes to the slag2019-06-11 22:21:27Scale insects, the sap of the dragon's blood tree is known as the holy medicine of blood, but it is also one of the favorite "food" of many pests, such as scale insects will invade the dragon's blood tree, hide on its leaves and suck the sap inside, and the leaves will grow poorly after being sucked, 1 The sap of the scale insect dragon's blood tree is known as the holy medicine of blood, but it is also one of the favorite "pure eggplant" of many pests, such as scale insects will attack the dragon's blood tree, Hide on its leaves and suck the sap inside, the leaves will grow poorly after being sucked, and the insects may appear in the spring, and if not treated in time, the dragon's blood tree can be infected with soot disease.

Prevention and **]: When there are more scale insects, we should spray with 800-** times of rapid culling, and prevention requires us to do a good job in the usual fertilization and environmental management of the slag stove to ensure that the application of sufficient fertilizer can improve the disease resistance of the dragon's blood tree, such as teasing the temperature after the temperature rises, we should pay attention to keeping the environment ventilated, and not let the dragon's blood tree be in a too closed place.

2 red spider red spider often appears slightly later than the scale insect, it will begin to hide on the back of the leaf cover suspect to suck the juice inside, causing the leaves of the dragon's blood tree to begin to fade, there will be yellow spots on the surface, and then the leaves begin to shrunk, yellow, etc., not only the efficacy and role of the dragon's blood tree is reduced next to the mountain, but also can lead to the death of the whole plant, so the red spider is one of the dragon's blood tree pest control skills that every flower friend should know.

Prevention and **]: The initial red spider is not easy to catch, you need to use 50% dichlorvos emulsion to add 1000-1500 times of water for spraying, the prevention method is to avoid the environment humidity where the dragon's blood flax tree is too high, when the temperature is high in summer, pay attention to ventilation to maintain air circulation, watering can not be less, otherwise it is easy to appear red plum to do the closed spider.

Dracaena tree, just by hearing the name, I feel that this is a plant with the power of the wilderness, indeed, the growth of the dragon's blood tree is very slow, this state makes its life far more than other plants, known as the longevity of the plant world.

Dracaena Dracaena is a plant with relatively high ornamental value, and it may have stunted growth and yellowing of leaves due to the following reasons. There are many reasons why dracaena leaves turn yellow: if there is not enough light for a long time, increase the light time; If the size of the pot is not suitable, replace the appropriate pot; If the temperature is low, take some measures to keep warm; If it is caused by insect infestation, it should be caught in time or killed with pesticides.

1. Increase light:

Dracaena prefers sunlight and humidity to grow, and if it is left in a cool place for a long time, the leaves will turn yellow. To let it fully receive sunlight, but also to ensure that the breeding environment is moist and warm, you can directly put it on the balcony, there is a good location for sunlight and ventilation.

Dracaena 2, replace the flower pot:

If you don't change the pot for a long time, as its roots continue to grow, the space in the pot will be insufficient, it will not be able to absorb nutrients, and the leaves will naturally turn yellow. Replace the pot in time according to its growth state, be careful when changing the pot, and try not to hurt the roots.

3. Increase the temperature

Dracaena prefers a warm environment, and if the temperature is too low, the roots will not be able to absorb water properly, and the leaves will turn yellow. Take some measures to keep warm when the temperature is low in winter, and do not put it directly in the place where the air conditioner blows directly in summer, so as not to affect its normal growth if the temperature is too low.

Dracaena 4, eliminate insect pests:

Spider mites are prone to appear due to the breeding environment, and the leaves of dracaena trees will turn yellow or even fall off when they are infested. After discovering the presence of red spiders, it is necessary to catch them in time, which is generally more convenient to catch manually, and can also be eliminated with chemical agents.

Many plant lovers may have a dragon's blood tree in their homes, after all, this tree looks good, and the ornamental value is quite high, which is also a lot of color for the home.

Dracaena.

1. Lack of light.

Although the dracaena has a certain shade tolerance, it should not be placed in a shady place for a long time during the growth period, otherwise it will be hindered when photosynthesis is carried out and the leaves will be yellow. In this case, it is necessary to move it to semi-shade as soon as possible, let it be exposed to more light and astigmatism, and soon the plant will recover. Pay attention to strong sunlight when it is blocked, and do not expose to the sun.

Second, the temperature is too low.

The dragon's blood tree prefers warm environments and fears the cold. If the temperature is below 10 degrees, growth will be stunted. If the temperature cannot be controlled in time, the plant will slowly yellow, yellow leaves will appear, and even leaves will fall.

In this case, the temperature should be controlled as soon as possible, and the temperature should be at least 10 degrees or more. If the temperature cannot be well controlled in the low temperature in winter, it is recommended to wrap it in a plastic bag to keep warm. Rock mass.

3. Soil discomfort.

Dragon's beard tree prefers slightly acidic soil, if the soil is too sticky and alkaline, it will hinder growth, and the leaves are easy to yellow. The pH value of the soil should be adjusted as soon as possible, and it is recommended to add an appropriate amount of ferrous sulfate to maintain the acidity when watering, so that it can recover slowly.

Fourth, insect pests.

During the breeding of dracaena, if the environment provided by the ventilation capacity is poor, and the humidity and high temperature are high, this environment is easy to be infected with red spiders, which will cause yellowing of leaves. Drugs should be sprayed as soon as possible to thoroughly carry out the prevention and control of the branches. In addition, it is necessary to change the maintenance environment in the later stage, ventilate more, and properly control temperature and water.