Dendrobium pest control, how to control the pests and diseases of Dendrobium?

How to control the pests and diseases of dendrobium? Symptoms: Mainly damage the leaves, causing black-brown lesions, the size of the needle tip of the initial lesions, after half a month, the lesions form a nearly circular spot of about 3mm, the leaves around the lesions gradually turn yellow, the leaves fall off, and the whole leaves fall off in severe cases.

Pathogen and pathogenesis: The pathogenic bacterium is Colloidal Anthracnose, which is airborne by conidia and generally infected through wounds, which is the most common disease of Dendrobium officinalis artificially cultivated in Liancheng County. The main onset period is from 3 to August.

It occurs from seedling to harvest. The greenhouse cultivation conditions with high temperature and high humidity, especially when the relative humidity is above 22 30 and above 95, can easily induce the epidemic of the disease. It is also easy to get sick in the case of insufficient fertility and cold damage.

Friends who grow Dendrobium know that there are three main diseases of Dendrobium: black spot, rust and virus disease. If the prevention and control is not good, Dendrobium will suffer heavy losses.

Pest and disease control. Dendrobium pests and diseases are not serious, and it is normal to have pests and diseases. The various problems of Dendrobium officinale have been solved in a timely manner, and the scientific and reasonable treatment will not have an impact on Dendrobium officinalis.

Dendrobium officinale is a common orchid.

Dendrobium soft rot is easy to occur in high temperature and humid environments, and is prone to a certain degree of pests and diseases. It uses a thorn-like suction cup to insert people from the back of the leaf to absorb the juice of plant tissues, mainly harming the new shoots, young leaves and flower buds of Dendrobium officinalis, and in severe cases, causing the death of the whole plant.

Fluent text: Dendrobium is prone to mild decay in high temperature and high humidity environment, and the prevention and control of flower and insect diseases is not only easy to obtain raw materials, easy to prepare, economical and time-saving, but also has no pollution and no pollution. The prevention and treatment effect is also very good, and the onset is fast.

In severe cases, the whole plant decays and decomposes in the form of wet rot. In the early stage of the disease, 77% chlorpyrifos 101 surface wet powder 101 was used to prevent and control dendrobium disease. Dendrobium stems and leaves are feathers, nutritious, delicate, and susceptible to insect diseases and disasters, especially when diseases occur

In the early stage of the disease, remove the diseased leaves in time and spray 600 times of 75% wet powder chlortoram.

Dendrobium should strengthen management, reduce the environmental humidity of the local bucket, carry out ventilation and humidity, the plants with serious disease should be uprooted in time, incinerated treatment, the epidemic can be prevented and controlled by Bordeaux liquid or mancozeb, anthrax can be prevented and controlled by Bordeaux liquid or methyl wax disturbance Tobuzin, soft rot should pay attention to manual removal of lesions, and use agricultural streptomycin for prevention and control, and red spiders can release predatory mites to control.

Common diseases in Dendrobium cultivation.

1. Epidemics:The disease occurs in August to October, affecting the growth of the plant, there will be lesions at the base of the plant, water-stained, and the root system is easy to die, causing the top of the plant to wither, the leaves turn yellow and fall off, wilt, and then the leaves shrink and dry up.

2. Anthrax:The disease occurs in July and August, mainly for the damage to plant leaves, in the early stage of the disease, irregular lesions appear on the leaf surface, the edge is dark brown, ** color is light, causing the plant leaves to wither and fall off, seriously affecting the normal growth of the plant.

3. Soft rot:When there is a lot of rain, high temperature and poor ventilation, it is easy to get sick, which can damage the whole plant, and the pathogens are mostly infected from the roots, and will soon soften and rot, there is mucus on the lesions, and the rotten part has an obvious odor, the leaves will turn yellow, and there is a loss of rotten substances.

The main insect pest of cultivated dendrobium.

Red Spider:Spider mites are one of the pests that occur during the high temperature period in summer, also known as leaf mites, which eat miscellaneous, seriously harm the growth of leaves and fleshy stems, they hide in the leaves to suck sap, develop gray-white spots, affect the photosynthesis of leaves, and cause leaf scorching, defoliation and death in severe cases.

Dendrobium pest control technology.

1. Diseases:Strengthen water management, reduce environmental humidity, ventilation and humidity, serious plants should be uprooted in time, incinerated treatment, disease can be prevented and controlled by Bordeaux liquid or mancozeb, anthrax can be prevented and controlled by Bordeaux solution or methyl tobuzin, soft rot should pay attention to manual removal of lesions, and agricultural streptomycin for prevention and control.

2. Pests:Clean the weeds in and around the shed in late autumn and early spring to reduce the source of overwintering insects, spray the front and back of the leaves with soap bubble water, which can form a thin film, reduce the parasitism of mites, release predatory mites to control the damage of red spiders, and reduce the amount of pesticide residues.

1. Black spot disease.

When the black spots first appear, there will be dark brown spots on the leaves, which are yellow around the spots, and then slowly spread to the whole leaf, and finally the leaves wilt and fall off. From March to May every year, the disease is the high incidence period, and Bordeaux liquid or Doling can be sprayed to prevent the disease and control its development.

Second, snails. Snails like to eat the leaves and stems of Dendrobium officinale, which is extremely harmful and often eats the whole plant in a mess. Pay attention to cleaning up dead branches and leaves and keep them clean and hygienic.

Trichlorfon and bran can be mixed and placed in places frequented by snails, or pesticides such as trichlorfon or quicklime and salt water can be sprayed directly on the planting site.

3. Anthrax.

Wind and rain can spread anthrax, which generally invades with the wound of Dendrobium, so the disease generally occurs when there is a lot of rain. In the early stages of the disease, the stems and leaves of Dendrobium officinale will grow black dots, and a pink sticky substance will slowly appear on the small black dots, and finally the leaves will wither and fall off. Clean up fallen leaves and dead branches in time every winter to prevent germs from being stored in winter, and spray carbendazim or methyl tobuzin.

March-May every year.

Fourth, coal pollution disease.

It is also the onset period of coal qing or pollution disease. As the name suggests, when this pest and disease occurs, all the leaves are covered with a layer of black powder like soot, which affects the photosynthesis of the leaves. Prevention and control method: dilute and spray with carbendazim or dimethoate milk.

Fifth, the Philippine shield scale.

Phalaenopsis is a common parasite. Often hide on the back or edge of Dendrobium officinale leaves to absorb leaf juice, so that Dendrobium officinale leaves wither and fall off. If it is not well controlled, it will also cause yellow death of Dendrobium officinale and coal stain disease.

In the case that the Philippine shield scale grows into a shell, but the number is not large, the branches that have been damaged by pests and diseases can be cut off and burned together, or directly crushed to death. Late May is the incubation period for this insect. When the number of pests is large, dimethoate emulsifiable concentrate or stone sulfur mixture can be sprayed.

The common pests and diseases of Dendrobium officinale are snails, slugs, Spodoptera litura, grubs, short-fronted locusts, etc., and the main diseases are black spot, gray mold, white silk disease, etc. Black spot disease, which occurs in August 10, mainly affects the entire plant. Black-brown spots first appear at the base of the plant in the shape of water stains.

Causes root necrosis, the tips of the plant dry out, the leaves turn yellow, wilt. In severe cases, the lesions continue one after another, as if the whole plant has been scalded by boiling water, and then the leaves dry up. In prevention, it is necessary to strengthen moisture management and control the humidity in the shade.

In the rainy season, it is necessary to block the sunlight around the shady place, ventilate, reduce moisture, and reduce the occurrence of diseases. Plants with serious diseases should be drained in time, and the shade film should be taken out and burned.

Anthrax, which occurs in July and August, mainly affects plant leaves. At the beginning of the disease, small spots of fading appear on the leaf surface, which gradually expand, forming signs of roundness or irregularity, dark brown edges, ** part of light color, causing the leaves of the plant to wilt and seriously affect the growth of the plant. It can be prevented by Bordeaux solution or methyl tropic slump.

Soft rot is rainy, the temperature is high, and it is easy to get sick when the ventilation is not good, which can harm the whole plant. The germ penetrates a lot from the roots, begins to appear green and water-stained, develops rapidly, softens to yellow-brown, and rots. The rotten parts have a distinct odor.

When the disease is severe, the leaves quickly turn yellow, and the loss of decaying matter is dry rot. To remove the lesion manually, prophylactic with agricultural streptomycin.

Pest prevention - Butterfly moth larvae can be protected by setting up insect repellent nets around shady areas to prevent adult worms from laying eggs. If the loss is severe, karyopolyhedrovirus, avermectin, etc. can be selected for prevention.

Mollusks - slugs and snails mainly occur in spring and autumn, especially in the evening or at night after rain come out in large quantities to gnaw plant leaves and buds, gnaw plant mesophyll, stems are broken, and buds are eaten, which seriously affects plant growth and affects yield. In terms of control, it is necessary to remove weeds inside the shade in time. Ceramic bowls can be spread on the footstool of the seedbed and injected with quicklime water to prevent pests from invading the seedbed.

One year after planting, earthworms begin to appear in temperament. Earthworms accelerate the decomposition of the substrate and "soilize" the loose substrate, which is not conducive to breathable pitchers and affects plant growth. Boil the bran broth with water for 30 minutes, then take 1:

The ratio of 100 prevents pouring water into the cemetery every 2 to 3 months.

First of all, when planting, we must choose the soil is relatively fertile and wide land, and in the process of fertilization, we must use farmhouse fertilizer, do not use the fertilizer bought outside, and often water the plants, to prevent the occurrence of pests and diseases, if there is a situation of small insects, then we must spray insecticides in time. If we can do this well, we will definitely be able to prevent it.

If there are pests and diseases, then you can soak the tobacco in water and spray it with such water, and then you can spray it with lime water, and you can also spray it with professional insecticides, which can have a good effect.

You can go to change some loose soil, and you should also go to fertilizer, it is best to choose farmhouse fertilizer, so that you can prevent it, and you should also water more when planting, choose some soil with higher nutrient content, so that you can completely **.

In planting management, increase the light time, let the temperature rise, the soil becomes drier, the humidity is about 20%, and then spray pesticides, so that you can control pests.

It is necessary to choose excellent varieties, strengthen field management after planting, pay attention to planting density, pay attention to timely ventilation, and spray pesticides in time.

There are two common diseases of this plant. The first is black spot, which is more common in the early summer, and we can also see from the name that it can cause dark spots to appear on the leaves of plants, and in severe cases, many black spots will join together, and eventually cause the leaves to wilt and fall off. The second is anthrax, which can occur from January to May, and the leaves affected by this disease will appear with black or brown spots, somewhat similar to the first disease, although there are differences when viewed closely.

The infestation is mainly a bug called the "Philippine shield scale". This pest will parasitize on the back or edge of the leaves of the plant, and then they will slowly suck the sap in the leaves, and in the long run, the leaves will slowly turn yellow or fall off, and even cause the death of the whole plant, which is really not to be taken seriously. This pest is mainly common in late May, when it is at its peak for breeding and hatching.

For the first disease, we generally use Bordeaux liquid (ratio 1:1:150) for prevention and control. Of course, Hui Kongrang, Duo Ling a thousand times the potion can also be used.

For the second disease, we use carbendazim 1,000 times (50% concentration) or methyl tobuzin 1,000 times liquid spray (50% concentration) for spraying, two to three times is enough.

To deal with pests, it depends. If the number is relatively small, the method of cutting off the diseased and old branches and burning them intensively can be used for prevention and control. However, once the quantity is relatively large, it is necessary to use a medicate.

When it has this disease, it will begin to appear small black-brown spots on the young leaves, and then the spots will be yellow around them, and they will slowly spread to the leaves, and when the black spots are severe, they will form patches on the leaves, and finally the leaves will begin to wither and fall off. This disease generally begins to occur in early summer, so we must prevent and treat it in time, and generally spray it with some special drugs to prevent and control its development.

At the beginning, it will cover the surface of the entire leaf with a powdery substance similar to soot, which will seriously affect the photosynthesis of the leaves, and stop the growth of the plant. The main time of onset of this disease is generally from March to May. At this time, we will find some carbendazim for a certain concoction, and then spray them 1 or 2 times, which can kill them very well.

Get a fundamental solution.

This pest is mainly parasitic on the side of the leaves of Dendrobium drumsticks or the back of the leaves, and when it comes and goes, it will make the leaves of the plant begin to wither, and in severe cases, the whole plant will die. At the same time, it can also cause new coal stain diseases. At this time, we must prevent and control in advance, this pest is in May when it starts to lay eggs, at this time we use some dimethoate emulsifiable concentrate to prepare and spray them, the effect is very good.

There are also some that have become shield shells but there are not many of them, you can cut off their old branches and leaves, and then burn them all together to achieve complete control.

It mainly hides on the back of the leaf to eat the mesophyll or bite the stem to damage the petals. This pest can occur many times a year, and once it happens, the damage is very great, and often the whole plant can be eaten in one night. Then we can put some poison bait and put it in a place where they are constantly active to kill them.

In addition, in the surrounding environment of cultivation, it is also good to sprinkle some drugs for prevention and control.