Hi, Dr. Agronomy Teaches Growing Answer this for you.

Cuscuta belongs to a very harmful parasitic plant, also called rootless grass, yellow silk, spinosa family Cuscuta genus, 1 year-old herb. Cuscuta's leaves tend to degenerate into scales with cells devoid of chloroplasts, and it mainly relies on the stem to climb and cling to the host plant, sprouting spines in the parts that touch the host and poking into the host's phloem in order to suck up the nutrients and complete its own growth, resulting in the death of the host plant starting from the branch stalks.

I. Introduction to Cuscuta

1. Morphological characteristics

Cuscuta is technically a seed plant, and there are mainly species such as Japanese Cuscuta, Hops Cuscuta, Chinese Cuscuta, and Southern Cuscuta. This kind of plant to seeds in the soil over winter, the next year's summer sprouting rod-shaped seedlings, to grow to 9-15 cm, the front end began to rotate, and encountered the host plant that will be entangled quickly produce sucking roots and host close together, after the root and stem base that is dead and soil detachment, mainly relying on sucking roots from the host body suck nutrients to maintain their own lives. Cuscuta's young stems continue to elongate and branch to wrap around, the apex will be in contact with the host stem to form sucking roots, continue to branch and extend, and then form a canopy of rootless vine, and more growth in weeds, bushes, and wet soil plots, mainly harmful to forests, fruit trees, cash crops and so on.

2. Type

In China, the two most common species of Cuscuta are Japanese Cuscuta and Chinese Cuscuta. The stems of Japanese dodder are particularly robust, 2-3 millimeters in diameter, yellowish-white, with raised purple spots, linear, and well-branched. The inflorescence of Cuscuta is spikelike and the corolla is campanulate, appearing white. The fruit is a capsule, subglobose, containing 1 - 2 seeds. The stems of Cuscuta chinensis are slender, usually less than 1 mm in diameter, and yellow in color. The flowers are lateral, clustered in umbellules or umbellules, the corolla is white in color and pot-shaped. The fruit is a capsule with 2-4 seeds.

3. Symptoms of infestation

Cuscuta is rootless, leafless or with reduced foliage, grows in twines and spreads rapidly, and broken stems can form suckers and continue to grow. The flowers are pink and the fruits are globular, and each dodder plant produces 5,000-6,000 seeds that can survive in the soil for several years. Cuscuta has a wide range of hosts, mainly woody plants, but also harms herbaceous plants. Cuscuta spreads rapidly, mainly to seedlings, young trees and shrubs, but not to aged bark, and to taller trees through inter-root shoots or by using other hosts as bridges.

4. Hazard characteristics

Cuscuta has a wide host range, mainly on woody and herbaceous plants such as Leguminosae, Asteraceae, Polygonaceae and Rosaceae. The hosts of dodder are mostly natural grass forages, with a high rate of damage to leguminous, aster, and quinoa forages. Cuscuta infests the plant by entangling the entire plant to victimize it. Cuscuta damage to the host plant is serious, the host entangled by dodder weakens, often showing wilting, yellowing and dwarfism, which can lead to failure to bear fruit properly until death. Cuscuta is highly spreading, spreading from a single plant in all directions. A plant entangled in the stems of codling moth will be surrounded by plants entangled in the nascent stems of codling moth.

II. Cuscuta control measures

1. Physical control

Cuscuta relies primarily on seeds for reproduction and dispersal, with summer and fall being the peak growth periods for Cuscuta. Once the parasitic relationship is established, the dodder is detached from the underground portion of the host plant and the stem continues to grow and branch until it covers the entire canopy of the host plant. Typically, it flowers in late summer, bears fruit in the fall, and the ripe capsule breaks apart to disperse seeds that eventually fall to the ground and overwinter. For the harmful characteristics of dodder, we can take physical methods to control.

2. Pharmaceutical control

For dodder that occurs in weed bushes, we can spray diquat or 2%-3% sodium salt of pentachlorophenol for control, interrupting dodder stems before spraying for better control. During the emergence period of dodder, ground spraying 40% Diloxan 1000 times solution can effectively remove the seeds in the forest floor.

3. Strict phytosanitary

During the transportation of plants, it is strictly prevented from spreading seeds from diseased areas to disease-free areas. Seeds from diseased areas need to be sieved and tested during transportation, and samples of seedlings or large trees with rhizome and leafy soil should be taken for direct testing, so as to effectively cut off the trans-regional transmission of Cuscuta.

4. Manual removal

Timely removal of ground weeds and climbing host plants can reduce intermediate hosts. In late spring and early summer, we should carefully inspect the seedlings and eradicate them as soon as they are found, or cut them along with the victimized parts of the host. After the dodder has entangled the host plant, artificially remove the dodder from the host; the cleaner the stripping, the more complete the control will be. Cuscuta's broken stems also have the ability to develop into new plants, so cutting must be thorough, and the cut stems should not be thrown away, but need to be concentrated in deep burials or sent to the landfill for incineration, especially in late spring and early summer.

5. Developed and utilized as medicinal plants

Cuscuta is pungent and sweet in flavor, slightly warm in nature, belonging to the liver, kidney and spleen meridians, gentle in qi and nature, capable of floating and sinking, and has the medicinal value of tonifying the kidneys and benefiting the vital essence, nourishing the liver and improving the eyesight, and strengthening the spleen and fixing the fetus. When the seeds are ripe in the fall, cut them down together with the host plant, dry them in the sun and knock down the seeds, sieve out the impurities and then use them as Chinese medicinal Cuscuta, which can turn waste into treasure and can gain economic benefits.

Conclusion: Cuscuta is extremely vigorous, reproduces quickly, spreads rapidly, and often poses a major threat to local agricultural cash crops, we need to take a series of effective measures to get rid of Cuscuta in order to realize a comprehensive and effective containment of Cuscuta's breeding and spreading.

[I am a Chinese Academy of Agricultural Sciences, a doctor of agronomy, click on the upper right corner can follow me! Every day, I update the knowledge of agricultural cultivation, promote high-yield crop technology, and welcome your comments and corrections!]

These two things are important to know about the dangers of cuscus, and don't think it's perfect because it's potent.

Rural herbs, including all types of Chinese medicine, there are antidote, tonic, heat-clearing medicine, etc., many are wild products, with no pollution, good efficacy, however, theThey're not all perfect.。

When utilized wisely, it is important to understand their dangers or they can harm people instead.

Like some toxic Chinese herbs, including Cang Er Zi, fennel garlic and so on, these can not be used freely. However, some herbs are not toxic, they need to pay attention to some details, otherwise it is harmful.This brings us to dodder.

Cuscuta is one of those clinging plants, as if golden yellow silken strips were bunched together, often spreading over the tree, giving it a large cover and tying up its growth.

Then comes the first hazard, and this one is primarily for the dependent.

In addition to spreading on the tree it is attached to, it is also very twining, which undoubtedly restricts the growth of the tree, as if strangled, and this characteristic gives the dodder the name "noxious weed".

Among the more common plants that are infested trees are legumes and asteraceae, and some are even crops that are hard to get out of the way once you've been targeted by this plant.

The second hazard comes in terms of medicinal value.

Cuscuta mainly has the effect of nourishing the liver and kidneys, many friends feel that such a tonic medicine, will make the solution to some of the troubles, then you can feel free to decoction, in fact, not so, it does have medicinal value, but to look at the problem, you need to analyze the problem from both sides, there is a good side, that there will be a bad side.

It's harmful, that's what's bad about it.

The thing to watch out for with this herb is that theHematochezia, strong yang, constipation, fire in the kidneys and yin deficiency and fire activationIt is not to be used. Stool knot is the dryness of the stool, as for the other, you can take your time to check, if there are those conditions still use Cuscuta, then the harm will be great.

So the dodder is also harmful. The focus is on the harm to people, not to be able to unauthorized use of the drug, not because there is a role in that area can be used at will, after a doctor's defense of the drug, if the body does not allow, can not try.

Not only for Cuscuta, but for any kind of Chinese medicine.They can be of medicinal value and equally harmful.

I hope that the two points shared above will be helpful to you, theFollow Old Evil for more rural flowers and plants.

Don't forget to like and favorite this article if you think it's good, thanks.

Do you recognize this plant that I grow at home? It is an agricultural by-product and an authentic herb, mugwort!

The field I chose to plant is one that used to be planted with rice, then was abandoned for two or three years, then it was replanted with mugwort without herbicides. When it was previously derelict, I didn't notice any of that rabbitbrush either, and since I put that mugwort in, the dodder has appeared on its own!

At first I didn't think so, I thought it was pretty and fun to see this thing grow yellow. I've never seen anything like it before, so I thought it was rare, so I just let it grow.

A large patch grew, and as it lengthened, the rabbitbrush grew larger and larger, forming a huge web now. A comparison revealed that my mugwort was getting yellow and shorter.

You can clearly see that the long rabbit wire finger of mugwort grows poorly. Whereas the areas without rabbit wire fingers grew taller and had lighter leaves and produced a high leaf yield.

It's wherever the rabbit wire grows, it sucks nutrients from the host, and slowly the host becomes malnourished and withers.

So it's better to pull this thing out before it's too late when you see him, and I don't have any good ideas on how to try to eliminate it, because it mixes with the crops we're going to grow, and when you hit the herbs, everything is gone.

It's a good idea to throw in the towel.

So it's just a matter of manually pulling it by hand or using a hoe, there's no other good way to do it.

Finally, I'll post a few pictures to show you how dodder is stirred up with this mugwort. They are so hard to separate together, you can't separate them at all, and the harm is pretty great.

I wonder if anyone has any good ideas on how to separate it from normal crops and keep it from harming them.

I thought was fretting about that, Wormwood, because it's all cut back in production.

End of answer, I'm old Wu Herb!

Cuscuta is a pernicious weed of campanile parasitism that not only harms specialists, but even roadside plants and trees.

To understand the dangers of dodder, you must first understand the biology of dodder.

The fact that dodder is rootless and leafless does not mean that dodder itself has no roots or leaves; in the very beginning when the seeds of dodder sprouted, there were still roots, and with the emergence of the entangled stems, dodder attached itself to a plant, and then grew suckers that latched on to the entangled plant and began to absorb the nutrients of the plant. This is the legendary lazy cancer and a typical parasitic plant. The twining stems of Cuscuta are a golden yellow color, very pretty, and often clustered. Since it does not need to photosynthesize on its own, the leaves of the dodder have degenerated over a long period of evolution to form small bell blades. Its flowers are numerous and its capsules are subglobular. Cuscuta was also first recognized because it often accompanies legumes such as soybeans, and its small, numerous seeds make it easy to mix in legumes. Therefore, it becomes difficult to remove dodder from subsequent plantings.

So what are the dangers of doddering?

In terms of performance, it is to suck water and nutrients from the host through the suction apparatus, and due to the strong growth capacity, it can quickly cover the entire plant canopy, seriously affecting the photosynthesis of the plant, resulting in plant thinness, yellowing and withering of leaves, and in severe cases, withering; it will also puncture and damage the vascular bundles and sieve tubes of the host, resulting in damage to the conductive tissues, which will then lead to the plant pathogens and viruses taking advantage of the weakness and causing the development of plant diseases.

Preventive and curative measures:

First, select seeds to avoid mixing of dodder seeds.

Second, deep tilling. Cuscuta seeds are small, deep tilling will be its seeds buried deeply, inhibiting their germination.

Third, the use of fungal herbicides - Lubao 1 biological agents, this agent is specific to the dodder, will not affect other crops, generally formulated 100-200 times the liquid, stirred thoroughly, and filtered through gauze 1 time, the use of the filtrate (each ml contains 20 to 30 million spores) spray, only on the cuscuta Spray only on the place where there are doddering seeds. Every 667 square meters with 2 ~ 2.5 liters, in the rain or evening or cloudy day spraying, every 7 days 1 time, continuous control 2 ~ 3 times. Spraying 2 people operation, 1 person in front of the first tree strips will be doddering occurs a few times, resulting in wounds, another person then spraying, because there is a wound is conducive to the invasion of fungal spores from the wound to improve the effectiveness of prevention. Avoid high temperatures in the middle of the day or under drought conditions.

Fourth, chemical control. Spraying 2% Paraquat, or glyphosate, kills the surrounding weeds so that they have nowhere to parasitize and wither naturally.

Fifth, manual removal. If the above methods can not be solved, you can take the method of manual extraction, economic, simple and effective.

I hope the above will be helpful to you.

When I was a youth in the countryside, I was introduced to Cuscuta, which is called "yellow vine" by local farmers.

This thing is orange-yellow, such as silk thread, specializing in beans or other plants, the growth force is extremely tenacious, that is not afraid of flooding, not afraid of drought. Especially entangled in the beans on the dodder, like a "vampire", the soybean "torture" of the "thin as wood". Every year is because of the dodder flooding, caused by a large number of soybean yield reduction, let the farmers suffer.

jeopardize

Cuscuta is itself a medicinal plant, but it causes disease to a wide range of medicinal plants. The main medicinal plants affected by Cuscuta are Atractylodis paniculata, Hyssop, Scutellaria baicalensis, Platycodon grandiflorus, Chaihu, Thornybush, Perilla, Pelargonium, Chrysanthemum, Fenghuangxianhua, Cranesbill, Cockscomb, Nightshade, Lunar New Year's Eve, Asteraceae, Corchorus coronarius Buckwheat, Ben Hibiscus, Azalea, Rosa canina, Juniperus virginianus, Cinnamomum officinale, Salvia divinorum, Gentiana officinalis, Basil, Oleander, etc. The plant grows weakly and the leaves turn yellow. After the damage of medicinal plants, plant growth is weakened, leaves turn yellow, and in severe cases, orange death.

prevention and cure

1 Prior to sowing, the seeds were screened and the mixed^ seeds of Cuscuta were removed.

2 For plots of land seriously affected by dodder, rotate with groundnut and grass crops and combine with deep plowing of the land to bury the seeds of dodder deeply.

3 often to the field to check, found that the amount of dodder seeds can be artificially removed when the amount of small Chen; amount of large and serious, should be in the cuscuta before the flowering of the herbs together with the pulled out of the ground buried. To remove thoroughly, or leave part of the broken stems. Will continue to spread the harm.

4 Organic fertilizers used, must be treated with high temperature rotting.

5 Shallow hoeing to destroy seedlings. In plots where codling moth occurred in the previous year, tug hoe the ground when codling moth emerges to reduce codling moth occurrence.

6 In the early stage of the spread of dodder, brio application of Lubao I "biopesticides. Dosage: 1.5-25kg per mu for powder spraying; 0.25-0.4kg per mu for spraying with industrial products, 0.75-1kg for soil products, and 100k of water. "Lubao No.1" is a fungus, which can make dodder die of anthracnose. In order to improve the prevention and control effect, when spraying "Lubao No.1" biopesticide, the following matters should be noted: ① Timely spraying. Cuscuta spread early resistance to thrive weak. Prevention and control of labor-saving, drug-saving, high effectiveness. The gourd powder and the fungus liquid shall not be exposed to sunlight, and shall be used as soon as it is dispensed. Spraying should choose cloudy days and high humidity. When the humidity in the field is high (relative humidity 90%-100%) and the temperature is 25-28℃, it is conducive to the invasion of the spore germination of "Lubao No.1". Spraying can be done throughout the day on tomorrow or light rainy days. Sunny days should be sprayed in the morning or after 4 pm. ② Insert markers. Before spraying, make a general survey. Insert clear markers where there are codling moths. And before spraying the dodder with a bamboo pole to pick wounds, with wounds, "Lubao one" easy to invade from the wound. It is best to spray in batches and phases. ③ Pay attention to the concentration of chemicals used. Cuscuta occurs in the tough stage, the concentration of spores in the liquid, including 30 million / ml, the occurrence of 50 million / ml. For details, see the product instructions. ④ Preparation of liquid medicine, should be first seedling powder in gauze bags, put a small amount of water soaked 10-15 minutes. Hand rubbing, repeated changes, the spores into the water, until the solution is washed out when the water. But the use of water should not exceed the number of times it should be prepared. The spores will be washed out of the spore collection pinch, add enough water. And then connect the number of drugs to add 0.1% washing powder. The preparation is completed. ⑤ The number of times of control. The number of times of prevention and control depends on the weather conditions. If the spraying humidity, quality of medicine 1-2 can be happy, if the spraying of dry weather or the occurrence of severe dodder, should be sprayed 3-4 times. The two intervals between the time to chew about 7 days is appropriate. ⑥ The sprayer should be scrubbed clean, especially the sprayer that has been sprayed with fungicides such as stone Liu synthetics and Bordeaux liquid. So as not to affect the effect of prevention and eradication. ⑦ For the art of this medicinal plant, in the dodder seed germination peak, the ground can be sprayed with 1.5% pentachlorophenol paved or 2% puffing grass net liquid, and then sprayed once every 20-25 days. Spray 3-4 times in total to kill the seedlings completely.

Cuscuta is a class of twining herbs or woody plants camping parasitic life of annual herbs, its roots have degenerated, leaf blade degraded to scale-like sheet, the stem is a yellow filamentous material, slender, fleshy, stem twining after the growth of suction, with the help of suction fixed host, absorption of host nutrients, water and assimilation, resulting in the poor growth of the host, or even pieces of the host died.

Cuscuta host range is wide, can be parasitized in the legume, Solanaceae, Rosaceae and other woody and herbaceous plants, seedlings and flowers can be parasitized by the dodder damage, and the damage is heavy, reproduction and diffusion of the spread of fast.

Cuscuta mainly reproduces and spreads by seeds, summer and fall is the peak growth period of Cuscuta, when the parasitic relationship is established, Cuscuta is detached from its underground parts, the stems continue to grow and continue to branch to cover the entire crown, summer not flowering, fall successive fruit, after maturity, the capsule rupture dispersal of seeds, fall to the ground to overwinter.

In addition, in addition to being harmful in its own right, Cuscuta can spread pathogenic bacteria and viruses, causing plant diseases.

Cuscuta damage: Cuscuta spreads mainly by seeds and broken stems, and is also characterized by "general parasitism". It parasitizes a wide range of plants and is commonly found in soybean fields. A wide range of plants can be parasitized. When a plant is parasitized, not only is the yield and quality of the plant reduced, but it may also be infected with plant viruses.

Hazardous objects, azaleas, roses, June snow, peonies, coral trees, holly, privet, potatoes, peanuts, 'legume forage and other dryland crops.

Harmful symptoms: seed germination of young shoots colorless, filamentous, attached to the soil particles, the other end of the formation of filamentous cuscuta, rotating in the air, encountered the host will be entangled on it, in contact with the formation of sucking roots, into the host tissues, some of the cellular tissues are differentiated into the conduit and sieve tubes, and the host's conduit and sieve tubes are connected to suck the host's nutrients and water. At this time, the primary dodder death, the upper stem continues to elongate, and again the formation of sucking roots, stems continue to branch and elongate the formation of sucking roots, and then to the four sides of the continuous expansion of the spread, when the seriousness of the whole host covered with dodder, so that the victim plant growth is poor, and there are hosts due to nutrient deficiencies coupled with dodder entanglement caused by the death of the whole plant. Once found to be timely management, such as non-management to farmers caused great losses.

Cuscuta damage: Cuscuta is mainly spread by seeds and broken stems, but also has the characteristic of "pan-parasitism". The range of plants it parasitizes is very wide, and there are more than 100 kinds of plants that can be parasitized by field dodder in Xinjiang alone. After the plants are parasitized, not only the yield is reduced and the quality is lowered, but also plant viruses may be transmitted.

Hazardous objects: hibiscus, azalea, rose, June snow, osmanthus, peony, coral tree, chicken claw maple, holly, chaste tree, potatoes, peanuts, houma, ramie (zhu) and legume forage and other dryland crops.

Harmful symptoms: seed germination of young shoots colorless, filamentous, attached to the soil particles, the other end of the formation of filamentous cuscuta, rotating in the air, encountered the host will be entangled on it, in contact with the formation of sucking roots, into the host tissues, some of the cellular tissues are differentiated into the conduit and sieve tubes, and the host's conduit and sieve tubes are connected to suck the host's nutrients and water. At this time, the primary dodder death, the upper stem continues to elongate, again forming sucking roots, stems continue to branch and elongate the formation of sucking roots, and then to the four sides of the continuous expansion of the spread, when serious, will be the whole host covered with dodder, so that the victim plant growth is poor, there are hosts due to malnutrition plus dodder entanglement caused by the death of the whole plant.

Cuscuta is a parasitic plant, we often grow in soybean fields, it is vigorous, parasitic way is very special, it meets a suitable host, it will extend its own sucking roots into the host's tissue, and then begin to absorb the host's nutrients, is a very vicious parasitic weed, known as "plant vampire", listen to this It is a very vicious parasitic weed known as "plant vampire", which is a horrible name to hear.

dodder (Cuscuta sinensis, a parasitic vine with seeds used in medicine)

The damage is very widespread, such as soybeans, alfalfa, bittersweet, apples, and thousands of other plants.

Reproduction is very strong, with one plant producing around 2,500 seeds, or even tens of thousands of seeds.

The vitality is very tenacious, the infested land, once there are seeds left behind, it may erupt again ah, its seeds have dormant properties and germinate even after many years, it is difficult to eradicate.

The growth rate is very fast, it will cause the host leaves to be covered, affecting normal photosynthesis, and it sucks up the host's nutrients, causing the host to grow poorly, and it also causes infectious diseases, which can cause the host to die in severe cases.