The topic of a Canadian yellow flower has recently frequently appeared on the hot search, and a Canadian yellow flower (also known as the "devil's flower") has invaded many places in Henan and Hubei. Recently, a Canadian yellow flower was also found in Pingyin, Jinan, what kind of plant is it? What should I do when I see it?
A yellow flower in Canada
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(Solidago canadensis) Asteraceae. It is a perennial herb with a straight root system and well-developed rhizomes, growing transversely in shallow soil layers. The stem is erect, nearly lignified, and the plant height is 2 to 3.5 meters. Single-leaf, alternate, no leaflet. The cephalic inflorescence is yellow, arranged in a scorpion tail on the upward side of the flower axis, forming an unfolding conical inflorescence; the total bracts are barrel-shaped, yellow-green, 3 to 4 layers, covered with tiles; the disc flowers are tubular, and the edges are tongue-shaped flowers. The lower emaciated fruit is cylindrical, and the crown hairs are coarsely hairy and white. Native to North America, it was once introduced around the world as a garden ornamental plant, and later grew as a malignant weed. Shade-tolerant, drought-tolerant and barren-tolerant. Propagate with seeds and rhizomes. Threatens the biodiversity of ecosystems and agricultural production and causes significant environmental and economic losses. The harm is greater in East China.
China is one of the countries with the most serious invasion of alien species, with more than 660 species. What are the other common invasive alien species in China?
The popular crayfish of foodies, scientific name Protocrayfish, is actually an invasive alien species.
Protocellum crawfish
(Procambarus clarkii) is also known as "crayfish", "freshwater crayfish", "slug". Crustaceans, Crawfish family. It resembles a shrimp and the carapace is hard. Adults are about 5.6 to 11.9 cm long, the body is dark red, the cephalothorax is reddish-brown, and there is a pair of large claws on the cephalothorax, so it is commonly known as "red crawfish". The claws are narrow and long. The carapace is distinctly grainy. Omnivorous, fast growth rate, strong adaptability, is a globally important invasive alien organism, serious harm to the survival of local species and biodiversity. Native to the off-the-sea area of Louisiana, usa, it was introduced to China around 1930, and was distributed in most parts of China in the late 20th century, and has become an important freshwater aquaculture species with important economic value.
In 2003, fushou snail was listed by the State Environmental Protection Administration as one of the first 16 most harmful alien species to invade China.
Fushou snail
(Pomacea canaliculata) is also known as "large bottle snail" and "apple snail". Gastropods, Conchaceae. The shell is short and round, up to 7 cm tall, thick, right-handed, four or five layers of snail, and large body snail layer. The surface of the shell is smooth , golden yellow to dark brown , with a number of dark longitudinal stripes. It is thin,, with brown concentric circles on the surface. Hermaphroditic, allogeneic mating. Freshwater habitat prefers to cluster in shallow water areas of rivers and ponds or attached to the stems and leaves of aquatic plants. Omnivorous, large food, staple food duckweed and other aquatic plants, for rice, white, diamond horn, hollow cabbage, mustard and other aquatic crops and near the water sweet potato and other dry crops natural enemies. It is native to the Amazon River Basin of South America; China is distributed in Taiwan, Zhejiang, Fujian, Guangdong, Guangxi and other places. Can be used for consumption or feeding poultry. It is an intermediate host of Angiostrongylus cantonensis, and raw food can easily cause Guangzhou strongyloid disease, resulting in meningoencephalitis or meningitis. Can be farmed in captivity.
Because of its serious harm to tropical plants, the African giant snail is also listed as one of the world's top 100 invasive alien species.
snail
(Fruticicola) Gastropoda, snail family. The shell is lowly conical and right-handed or left-handed. The head is conspicuous, with two pairs of antennae, and the back pair has eyes at the apex. The ventral surface has flattened, broad feet. It inhabits humid areas. The walls of the coat cavity are rich in blood vessels, especially called "lungs", and can breathe air. It secretes mucus in case of dryness or hibernation to seal the opening of the shell. Keen sense of smell. It is a predator of plants. Certain varieties are available for consumption.
The red fire ant is also recognized globally as one of the 100 most dangerous invasive species, and its main characteristics are highly aggressive and poisonous bites.
Red fire ants
(Solenopsis invicta) Important invasive insects. It is a quarantine pest of plants entering China. Endanger crops, livestock, green spaces, electrical appliances and human health. Native to South America, it is now distributed in many parts of the world; China has been reported in Guangdong and other places. Insects, Hymenoptera, Antaceae. There are queens, males and service ants. Occupational ants can be divided into small service ants (worker ants) and large service ants (soldier ants). The former body length is 2.5 to 4.0 mm, the head, thorax, antennae and feet are brownish red, the abdomen is often tanned; the antennae are 10 segments, the 2 segments at the end of the whip are enlarged into a rod; the base of the lip is obvious, each side has a tooth, the inner edge of the lip base has a triangular small tooth in the center, and the upper side of the tooth base is often covered with bristles. The latter is 6 to 7 mm long and resembles the former. Nests are generally mounds formed by obvious uplifts, with an average diameter of more than 25 cm and a height of 15 to 35 cm. When the nest is touched, the soldier and worker ants quickly go out, searching for intruders and attacking. People feel very tingling after being stinged, and there is a burning sensation, and blisters will appear in the stabbed area afterwards. There are two ways of diffusion: natural diffusion and man-made transmission. Prevention and control methods: strengthen quarantine and prevent spread; chemical control; boiling water treatment; flooding method, etc. In addition, a defensive emergency response mechanism needs to be established.
Vincentria cambore climbs other plants through lush foliage, causing other plants to lack light and gradually shrink, known as the "plant killer".
Vincentr
( Mikania micrantha ) also known as "small flower false Zelan". compositae. Perennial grassy or slightly woody vine. The stem is slender, creeping or climbing. The leaves are opposite, the veins are slightly raised, the central leaves are triangular and ovate, and the edges have several coarse teeth or shallow wave-like circular serrations, with 3 to 7 veins at the base. Most of the cephalic inflorescences are often arranged in the form of compound umbels at the end of the branches, each cephalic inflorescence contains 4 flowers, all of which are fruity amphoteric flowers, with a total of 4 bracts, and the corolla is white and tubular. The lower skinny fruit is shiny black. Native to Central America, South America. Prefers light and moisture, is intolerant of shade and barrenness. Stem nodes and internodes can take root and grow very rapidly. It is a harmful invasive species that is extremely harmful in south China. It is often used to cause the death of other plants by climbing edges, covering, etc., and is known as a "plant killer".
Water lotus seriously endangers aquatic ecosystems, and its harm is no less than that of water hyacinth and water peanuts.
Water flounder
(Pistia stratiotes) is also known as "Big Grass". Araceae. Perennial floating herb. The roots of the whiskers hang in the water. The leaves are rosette-like clusters on short shrunken stems, wedge-shaped, loosely fleshy, and floating on the surface of the water. Axillary buds produce creeping stems and new plants grow at the tip. The flowers are white, unisexual, hermaphroditic, and fleshy inflorescence. Berries with yellow seeds inside. Propagation in plants or seeds. Prefers warmth, humidity, light, and is not hardy. China is mainly distributed in South China, the Yangtze River Basin, and it is also cultivated in North China. Water surface and rice paddies are used for stocking, breeding fast, as green manure and green feed.
If an invasive alien species is found in your life, report it immediately. According to the principle of territorial management, small partners can call the nearest administrative district where the discovery area is located to provide clues. Illegal discarding of invasive alien species may be subject to criminal liability.
Reference: People's Daily