Introduced to China as an ornamental plant in 1935, it is an alien organism. After introduction, weeds will escape and become malignant weeds. It mainly grows on riverbanks, wastelands, both sides of roads, beside farmland, and around rural residences. It is a perennial plant with well-developed rhizomes, strong fecundity, rapid spread, obvious growth advantages, and broad ecological adaptability. It competes with surrounding plants for sunlight and compete for fertilizer until other plants die, posing a serious threat to biodiversity.
So it is called the ecological killer and the overlord flower. Included in the "List of Invasive Alien Species in China" (Second Batch).
Extended information
Goldenrod broad-leaved forest edges, forest understory, shrubs, hillside grasslands and roadside. Altitude 565-2850 meters. It is a polymorphic species with great variation in leaf shape and inflorescence pattern. ?
It likes cool climate and is suitable for cultivation in sandy loam or clay soil. Spring planting in April, drill sowing, row spacing 0.8-1 feet, covering soil 2-3 minutes, sowing about 1 and a half pounds per acre. Pay attention to watering after sowing, and seedlings will emerge in about 10 to 15 days.
When the seedlings are 2 inches tall, thin them out and keep the distance between plants 4-6 inches. For seedling transplantation, sow seeds can be sown in late March and transplanted one and a half months later. The spacing between rows and plants is the same as the direct seeding method. Fertilization should be carried out after the seedlings are established or transplanted. Manure (1 load of human fertilizer and 3 loads of water, the ratio to water is 1:3) can be applied once.
Prevention and treatment methods
1. Pull out
Canada goldenrod usually sprouts and emerges in early March. April to September is the vegetative growth period, and mid-to-late October Flowering, seeds mature from the end of November to mid-December. In order to effectively reduce the source of seed transmission, it is necessary to seize the favorable opportunity when the goldenrod seeds are not mature, quickly uproot all goldenrod plants, and cultivate the rhizomes left in the soil. The asexual reproductive organs are removed and taken out of the field to be burned and destroyed to eliminate the roots.
2. Burning
For areas where Solidago canadensis grows in contiguous areas, due to its shallow root distribution, it is generally controlled by uprooting and then burning. You can also cut off the flowering branches during the flowering period to reduce the number of seeds formed. This method is relatively simple but not thorough and cannot remove underground reproductive organs. Cut off the flower spikes, pull out the above-ground parts and tuberous stems, and then burn them as quickly as possible to prevent the spread of seeds, rhizomes and pulled out parts.
3. Chemicals
The control effect is better during the seedling stage or adult stage. During the emergence season and before and after flowering of Goldenrod Canada, pesticides are used to control the plants. The main pesticides for prevention and control are: we can use glyphosate and other biocidal herbicides and their compound agents to control them, and use their systemic conduction properties to kill the underground. For some, use a 5:1 ratio of glyphosate and laundry detergent to control it in its seedling stage.
Other biocidal herbicides can also be used for control. For control, use 100 grams of 80% glyphosate soluble granules per mu or 500 ml of 30% glyphosate aqueous solution per mu, mixed with 60 kilograms of water and spray.
Baidu Encyclopedia - Goldenrod
Baidu Encyclopedia - Canadian Goldenrod