Content
- 1 A bit of history
- 2 Biological features of Sosnovsky hogweed
- 3 Interesting fact
- 4 Dangerous properties of Sosnovsky hogweed
- 5 Interesting fact
- 6 The benefits of Sosnovsky hogweed
- 7 Ways to combat Sosnovsky's hogweed
- 8 What you need to do to curb hogweed
- 9 Control measures that do not work
- 10 Conclusion
People say: if you want to annoy your neighbor, pour a handful of seeds into his garden hogweed Sosnovsky. What kind of plant is this and why are gardeners so afraid of it?
Hogweed - in Latin - Herácléum belongs to the umbrella family and has 52 species. Most of them grow in the Eastern Hemisphere, in its temperate regions. On the territory of our country there are 40 species of plants of this genus. Until recently, the most common was considered Siberian hogweed... Over the past 30 years, the Sosnovsky hogweed has gradually become the leaders.
A bit of history
There are several versions of the history of the appearance of this plant. Some believe that Sosnovsky's hogweed is the result of genetic developments of a secret institute. But if we take into account the attitude of the USSR government in the late 30s and 40s, in particular, Stalin, to genetics, this version seems problematic.
The answer to the question can be suggested by the Latin name of the plant - Herácléum sosnovskyi Manden. The last word is an abbreviation of the surname of the biologist who singled out and described him. It belongs to Ida Panovna Mandenova, a Soviet and Georgian botanist-systematist. On her account there are several more species of giant hogweed, which she identified and described while studying the flora of the Caucasus in the 40s of the XX century. Sosnovsky's hogweed was named after Dmitry Ivanovich Sosnovsky, who did a lot to study the flora of the Caucasus. The Sosnovsky hogweed plant existed in nature for a long time, but had a rather limited habitat. Its spread is the "merit" of the person who introduced this giant into the culture, which led to a man-made ecological catastrophe.
For the first time, experiments on the introduction of this plant into culture began in 1946, 4 years after the death of Academician Vavilov, who is credited with these studies. He was engaged in experiments in the Polar-Alpine Botanical Garden, located in the Murmansk region. Such an unusual choice of the region can be explained by the fact that in nature most of the hogweed species grow in the subalpine belt.
The Sosnovsky hogweed was intended to feed the animals. The huge biological mass of the plant - up to 2500 centners per hectare - gave bright prospects for its use as a forage crop. But hopes were not justified. The milk of the cows became bitter from such feed. Since Sosnovsky's hogweed turned out to be an antiseptic, it was not possible to ferment milk for processing. Due to the strong estrogenic activity of this plant, the cows began to have problems with reproduction. The calves were not hatched. As a result, they stopped feeding this crop to cattle, but the mechanism of plant dispersal had already been launched.
Biological features of Sosnovsky hogweed
The description of this plant should begin with its gigantic size.
- The height can reach 3 m.
- Stem thickness - up to 8 cm.
- The taproot goes deep into the ground up to 2 m.
- The leaves are impressive, ending in small thorns, reaching a width of 1.2 m and a length of 1.5 m.
- Flowers - huge umbrellas up to 40 cm in diameter, bearing a total of 80,000 flowers. Here they are in the photo in all their glory.
- The plant is monoecious, therefore it does not need a pollinator.Even a single specimen can lay the foundation for an entire colony of giants. Flowers are pollinated by insects.
The number of seeds in the Hercules grass allows her to successfully conquer all new territories, the record holders have up to 35,000 of them. And such a property as monocarp, that is, the ability to grow until the plant blooms and gives seeds, greatly complicates the fight against hogweed. Growth before flowering can take 12 years even with annual mowing. Seed germination is high and amounts to 89%. Their maximum viability is 15 years. They are light and carried by the wind over long distances.
- This plant blooms in July-August, and the seeds ripen in August-September.
- The stem is pubescent.
- Different types of hogweed can interbreed with each other, forming hybrids.
But not only the gigantic size allows this plant to dominate and displace neighbors.
Interesting fact
Most often, Sosnovsky's hogweed grows in a place with a disturbed grass cover - near former cowsheds and in places where unripe manure has accumulated, where cattle often walk. There is a simple explanation for this fact. The fact is that Sosnovsky's hogweed feeds on cyanobacteria and other anaerobic bacteria, which are present in excess in places with a low oxygen content, namely, where there is an accumulation of manure.
An avalanche-like process is observed: the better this plant feeds and grows, the less oxygen next to it, the more actively cyanobacteria multiply. To get rid of competitors, the plant learned to release special substances into the soil that have a detrimental effect on cells with a nucleus. These substances prevent them from dividing, effectively destroying them. Cyanobacteria and other anaerobes do not have a nucleus and everything goes only to the hogweed. This feature makes it not killable, but at the same time somewhat restricts its habitat.
Dangerous properties of Sosnovsky hogweed
Why is Sosnovsky's hogweed dangerous? It contains essential oils, the main active ingredient of which is furocoumarins, which have a photosensitizing effect, causing photodermatosis on the skin. The alkaloids and triterpene saponins contained in this giant are also considered toxic to humans. Consequently, Sosnovsky's hogweed is a poisonous plant, all its parts are dangerous, especially in the generative phase of development: during flowering and ripening of seeds.
Never come close to Sosnovsky's hogweed, let alone touch him.
The photo shows the consequences of contact with this dangerous plant.
The effect of essential oils on the skin is that it completely deprives it of its protection from ultraviolet radiation. Therefore, after contact and even just being near the plant, burns occur on the skin, which sometimes reach 3 degrees.
They are very painful, difficult to treat and do not heal for a long time. Most often, such burns have to be treated in a hospital. Recovery can take more than one month. Painful scars remain after burns.
A burn that affects the outer membranes of the eyes can result in blindness, as it also affects the cornea.
Unfortunately, between the effect of the ether vapors of the cow parsnip and the appearance of skin reactions, some time passes, about a quarter of an hour, contact with a dangerous plant continues and the degree of damage increases, therefore the consequences of burns are very severe, even fatal.
The burns from it are not so strong, but no less painful.
How to minimize the consequences of contact with Sosnovsky's hogweed is shown in the video:
This plant is especially dangerous for people with allergies. Contact with it can cause allergy sufferers, the so-called Quincke's edema, when the larynx swollen from the inside simply does not allow a person to breathe.
Interesting fact
A lot of negative things can be said about hogweed, but it also has medicinal properties. This plant acts as
- calming;
- pain reliever;
- antiseptic and anti-inflammatory;
- anticonvulsant;
- antispasmodic;
- antipruritic.
The spectrum of the medicinal action of this plant is quite wide. On its basis, effective drugs have been created for the treatment of many diseases.
The Institute of Biology of the Komi Republic received a patent for the use of a preparation from Sosnovsky's hogweed to suppress salmonella, and A.I. Sukhanov proposes to treat psoriasis with a tincture of this plant; he also received a patent for this method.
A detailed study of the cow parsnip Sosnovsky revealed other useful properties.
The benefits of Sosnovsky hogweed
- Having studied annual plants, scientists A.I.Sigaev and P.V. Musikhin found that their composition and physical properties are close to that of reed. Scientists managed to obtain a fibrous semi-finished product containing cellulose. It is able to partially replace wood raw materials in the production of packaging cardboard.
- Successful studies were carried out to obtain bioethanol from the raw material of hogweed, which is a biofuel.
- With the use of Sosnovsky hogweed as a fodder crop, not everything is unambiguous either. Sosnovsky's cow parsnip contains a lot of protein, which makes it possible to use it as a forage crop, but with certain restrictions. Silage from this plant in a mixture with other high-protein crops can be fed to animals not intended for obtaining offspring and milk: calves, bull-calves, fattening cows. Since furocoumarins are also present in hogweed silage, its amount should be strictly regulated. In small doses, these substances increase the productivity of animals, in large doses they are poison.
Interesting facts: there are very exotic ways of using hogweed, for example, as a musical instrument or material for protecting young tree trunks from mice.
The photo shows a chandelier made of Sosnovsky hogweed.
Ways to combat Sosnovsky's hogweed
But still, the harm from it is much more than the benefit. The increasing spread of this poisonous plant worries people in different countries. The issue of combating it is being resolved at the government level, in many countries there are already state programs aimed at eliminating this environmental catastrophe. The number of hogweed plants is constantly growing, they occupy more and more territories, suppressing the wild and cultivated plants growing nearby.
Is it possible to fight with it? The experience of different countries shows that it is possible, and quite successfully. There are effective ways to combat this giant grass that will help rid the territory of our country from the cow parsnip, leaving it with its original habitat.
What you need to do to curb hogweed
- A herbicide can be used against Sosnovsky's hogweed. The most common is Roundup. Its concentration should be at least 360 g / l. You will have to process plants more than once per season. The main condition is the amount of wetted leaves at least 70%. Any method of treatment can be applied: sprayer, paint brush. The greatest effect is observed when processing a plant in the phase of leaf regrowth. Plants are treated in a chemical protection suit.
- Agrotechnical techniques. Mowing the grass of Hercules gives an effect only under the condition of subsequent plowing, repeated disking and populating the area with perennial grasses or planting potatoes. It is impossible to mow the hogweed with a mowing mower or a trimmer, since it is possible for small parts of the plant to get into unprotected areas of the body.
- The use of a geotextile is possible if it is covered with soil with a layer of at least 5 cm from above and sowed with lawn grasses. Geotextiles are laid on crushed plants.
- Using black film. A black film is laid on the sloped surface of the earth and pressed well. In the next season, the site must be sown with grass or a crop that needs frequent loosening.
Control measures that do not work
- Normal mowing.
- Pruning and uprooting of rhizomes.
- Application of black non-woven fabric.
The Sosnovsky hogweed has a relative that is often found throughout the territory of our country, which is not only not a poisonous plant, but has long been used for food purposes - Siberian hogweed or bunch. The two are slightly different. The Siberian hogweed is smaller than its counterpart, it does not grow taller than 1.8 m. There are other differences: the leaves of the bunches are more dissected, the stem branches at the top and is more pubescent than that of the Sosnovsky hogweed.
There are differences in the inflorescences and their constituent flowers. The flowers have yellowish-green petals, and the rays of the complex umbellate inflorescence are pubescence. The Siberian hogweed emits a slight smell inherent only to him.
There is also a difference in the habitats of these plants: Sosnovsky's hogweed loves moist soils, but waterlogging is destructive for him, and his Siberian counterpart grows well in flooded meadows, along the banks of streams and rivers - where the soils are moist. You can also find it in sparse forests.
This species has long been used for food. Numerous local names also speak of this: cow parsnip, wild sorrel, borscht. Young shoots and leaves are eaten, the decoction of which smells like mushrooms. The leaves are put in a salad, and their petioles are pickled. The plant produces caviar that tastes like eggplant.
The green mass of Siberian hogweed is readily eaten by livestock.
Conclusion
In nature, there is a law of balance of species. Its violation due to ill-considered human actions in relation to the animal or plant world leads to environmental disasters. There are many examples of this. It also happened with Sosnovsky's hogweed. And if at one time it was thoughtlessly introduced into the culture, now they are also thoughtlessly trying to destroy it. Perhaps, having investigated Sosnovsky's hogweed in detail, humanity will wake up and begin to breed again what is so violently destroying today.
