Brazilian knotweed

Brazilian knotweed (Polygonum brasiliense) belongs to the Polygonaceae family. It is an annual herbaceous plant classified as a harmful weed in agricultural practice. Its morphological features allow it to adapt quickly to various growing conditions, actively competing with crop plants for space and essential resources.

The distribution range of this species primarily covers regions of South America; however, due to its high plasticity, it is capable of invading new climatic zones. This weed is most commonly found in fields with row crops, vegetable plantations, as well as on fallow land and along roadsides, where it creates dense patches of infestation.

The biology of the plant is characterized by high seed productivity. The seeds of Brazilian knotweed can remain viable in the soil for several years, which significantly complicates control efforts. Seed germination begins upon reaching optimal temperature conditions, after which the plant quickly develops a robust root system and significant above-ground biomass.

The harm caused by Brazilian knotweed lies in its ability to sharply reduce crop yields. It intensively consumes moisture and nutrients from the soil, suppressing the growth of crops. At high levels of weed infestation, crop losses can be substantial, and the mechanization of harvesting operations is also significantly hindered.

Control measures include a comprehensive approach that combines agrotechnical and chemical methods:

• Adherence to crop rotation including species that suppress weed growth.
• Thorough soil cultivation, including deep plowing to bury the seeds.
• Application of selective herbicides during critical stages of plant development.
• Timely inter-row cultivation in row crops to disrupt plant growth.