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Popular Science | Identification and control methods of invasive alien species "Canadian goldenrod"

author:Green Anhui
Popular Science | Identification and control methods of invasive alien species "Canadian goldenrod"

Introduction to the Canadian goldenrod

The Canadian goldenrod is a perennial herbaceous plant in the family Asteraceae, also known as oriole and unicorn grass.

Introduced to China in 1935 as an ornamental plant, it is an alien organism with strong fecundity, fast spread, obvious growth advantages, competing with surrounding plants for sunlight and fertilizer, until other plants die, posing a serious threat to biodiversity.

It can be said that yellow flowers do not grow anywhere, so they are called ecological killers and overlord flowers. It was included in the List of Invasive Alien Species in China (Second Batch).

The difference between a Canadian goldenrod and a goldenrod

Canadian goldenrod and goldenrod are different species, so it is inaccurate to call "Canadian goldenrod" "goldenrod". Goldenrod is a native plant that occurs in small quantities and is uncommon.

Popular Science | Identification and control methods of invasive alien species "Canadian goldenrod"

Canadian goldenrod

The rhizome of the Canadian goldenrod is well developed, and the plant is 1-3 meters tall; leaves lanceolate or linear-lanceolate, 5–12 cm long, three veins from base, rough on front; The cephalic inflorescences are arranged in conical inflorescences, which are born on one side of the inflorescence branches and are scorpiontail-shaped; Lean fruits all have fine hairs, cultivated for ornamental (trade name: yellow warbler), often used in flower arrangement, malignant weeds, the disadvantages greatly outweigh the benefits, for the eradication object.

Popular Science | Identification and control methods of invasive alien species "Canadian goldenrod"

Goldenrod

A yellow flower rhizome is absent or underdeveloped, the leaf veins are pinnate, the front is smoother, the head inflorescence is arranged in a total or conical inflorescence, the head inflorescence is not born on one side of the inflorescence branch, not scorpion tail, thin fruit smooth, sometimes slightly hairy at the apex, generally weed, for routine control and utilization objects.

The harm of the Canadian goldenrod

Known as the "king of demons", the "Canadian goldenrod" has terrifying fecundity and seriously endangers the native ecosystem, and has been included in the "blacklist" of the "List of Invasive Alien Species in China". It is drought-tolerant and resistant to poorer soils, so it can grow well on wasteland, and even grow luxuriantly in cracks and cracks in cement floors.

Popular Science | Identification and control methods of invasive alien species "Canadian goldenrod"

The rhizome is well developed

Its rhizome is well developed, and after the aboveground stem dries, it can sprout new plants from the roots the next year, so in addition to the seeds it sowed last year can grow into seedlings, its underground roots can also be superimposed to form sheets. Its underground root system is developed, and if the part of the ground that is pulled out is not properly treated and thrown directly into the soil, it will regenerate the roots, and then grow, and the process of pulling them will help them reproduce.

Popular Science | Identification and control methods of invasive alien species "Canadian goldenrod"

Strong fecundity

It has both sexual and asexual reproduction, sexual reproduction is its flowering and fruiting rate is very high, about 20,000 seeds per Canadian yellow flower, and the seeds are small and can be spread to distant places with the help of wind. If effective eradication measures are not taken, one plant this year may be one next year, leaving no room for native plants to grow.

Prevention method of Canadian goldenrod

Timely manual eradication

The Canadian goldenrod generally shoots in early March, blooms in early October, and matures in late November to mid-December. To effectively reduce the source of seed dispersal, plants should be eradicated before they mature. At the same time, the underground rhizome of the Canadian goldenrod can reproduce all year round, and when manually digging, the root system in the soil must be removed and destroyed centrally to prevent the residual rhizome from germinating again, so as to cut the grass and remove the roots.

Strengthen the management of wasteland

Since the barren area is the main breeding ground of Canadian goldenrod, strengthening the management of such lots, actively replanting or planting saplings, lawns and other green plants is an effective way to reduce or even completely eliminate their harm.

chemical control

Chemical control is the most cost-effective means of controlling goldenrod in Canada. Chemical control of Canadian goldenrod should be mastered in its emergence stage, that is, in April of each year to start the drug, after the drug to observe the prevention effect and growth, timely treatment, and adopt continuous prevention and control methods. In the emergence season and before and after flowering of a yellow flower in Canada, the use of agents to control plants is better, the control agents mainly include: can be used glyphosate and other biocidal herbicides and their compound agents to prevent and control, use its systemic conduction characteristics to kill the underground part, use glyphosate and washing powder 5:1 ratio mixed in its seedling stage for control; Other biocidal herbicides can also be used for control. 80% glyphosate soluble granules per mu or 30% glyphosate water agent 500 ml per mu, mixed with water 60 kg spray. Metsulfuron can also be used for extermination in non-agricultural land.

Original title: [Popular Science Publicity] Invasive alien species - Canadian goldenrod identification and control methods

Source: Anhui Forestry

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