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Septiembre es el momento de controlar el Centidonia japonesa
Tallo y hojas emergentes de Knotweed
El knotweed japonés(Fallopia japonica) ha sido calificado de "pesadilla" y "matón botánico", y es uno de los 100 peores invasores mundiales. Estos calificativos dan una idea bastante aproximada de lo mal recibida que es esta mala hierba invasora en nuestra comunidad.
Japanese knotweed is fast-growing and hardy, native to Japan, China, and the Korean peninsula, and was introduced to the United States in the 1800’s as an attractive ornamental. But don’t let the heart-shaped leaves, bamboo-like stems, and pretty, small white flowers fool you! It is a menace with many infestations in Oregon, including much of Clackamas County.
También conocido como "bambú mexicano" y "flor de vellón", el knotweed japonés es una maleza nociva de clase B de Oregón. Esto significa que es una mala hierba de importancia económica que abunda regionalmente, pero que puede tener una distribución limitada en algunos condados de Oregón. También significa que la propagación, el transporte y la venta de esta planta están prohibidos por ley.
Japanese knotweed is an herbaceous perennial. It is most frequently found along streams and rivers, where root fragments, seeds, or pieces of the plant’s green stalks were washed downstream by the current, creating new infestations. It is also commonly found yards and gardens, where unsuspecting homeowners planted knotweed, not realizing its potential for damage. From these introductions, it continues to spread to roadsides, forest edges, and vacant lots.
This fast-growing invasive weed can have annual growth of up to 10 feet. Stems are green to reddish-brown and hollow, segmented similar to bamboo, but are much weaker. It has alternate, leathery, thick, triangular-shaped leaves. Flowers are greenish-white to cream in large plume-like clusters at the ends of the stems. They bloom from late Julio to Octubre.
¿Por qué debería preocuparme el Centidonia japonesa?
Japanese knotweed spreads quickly along streambanks and in wetlands where it forms tall, dense stands that compete for light and resources. This harms our native plants which provide valuable food and habitat for pollinators and wildlife.
La knotweed también compite con la importante vegetación autóctona de ribera. A diferencia de nuestras plantas de ribera autóctonas, el knotweed muere cada invierno dejando expuestos los suelos de las orillas de los arroyos. Esto provoca una mayor erosión de las orillas, lo que a su vez daña el hábitat de los peces y los ciclos de nutrientes de los arroyos. El salmón se ve especialmente afectado por los daños causados por el knotweed japonés.
Knotweed grows not only from seed but also by root and stem fragments. Even the smallest fragment of a stem or root from Japanese knotweed can yield an entirely new colony downstream. To make matters worse, Japanese knotweed will grow even more quickly and densely in response to cutting, so many well-meaning landowners have unknowingly increased its spread in their attempts to control it.
Additionally, Japanese knotweed decreases property values due to the potential of asphalt, concrete, or foundation damage from the rhizome, as well as the long-term investment in management of the plants.
¿Cómo puedo controlar el Centidonia japonesa?
Infestación de Knotweed
Deshacerse del knotweed japonés no es fácil y requiere un esfuerzo persistente para tener éxito.
Manual and mechanical approaches for controlling knotweed combine cutting, covering, and digging. These approaches focus on starving the knotweed of sunlight and removing as much material as possible. These approaches are very labor intensive and require regular and repeated effort for success. Due to the massive time and effort involved with these practices, they are only recommended for very small infestations.
Al cortar o desenterrar el knotweed japonés, las plantas deben embolsarse y eliminarse como basura. También pueden amontonarse y secarse antes de quemarlas, pero debe colocarse una barrera entre las plantas y el suelo para evitar que vuelvan a enraizar. El knotweed arrancado o desenterrado no debe compostarse, ya que puede propagarse a nuevas zonas.
For larger knotweed patches, herbicides are one of the few tools that can be effective. Even with herbicides, careful timing is important to ensure success. Septiembre is a perfect time to control Japanese knotweed. Time herbicide applications just as its leaves are starting to turn from green to yellow. During this time, the knotweed plants are pulling energy from the back down into its roots system. This makes it more susceptible to the effects of herbicides. A carefully timed herbicide application can provide superior control to any other control methods. A landowner guide to controlling knotweed is available to learn more about these strategies.
Successful control of this invasive weed will take more than one year. While there are mechanical or manual control options for small patches, large sites will almost certainly require integrating herbicide use into your control strategy. For more information on how to control Japanese knotweed, please check out our knotweed brochure or contact our WeedWise team at 503-210-6000.
Denuncie el Centidonia japonesa
Have you noticed invasive Japanese knotweed in your area? If so, please report your sightings to the Oregon Invasive Species hotline or contact the District’s WeedWise program by giving them a call at 503-210-6000. Your help in identifying and reporting locations of Japanese knotweed in our community will help to stop the next invasion before it starts!
Para más información sobre el knotweed, consulte estos recursos:
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Biología y gestión de Knotweeds en Oregón
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Mejores prácticas de gestión de Knotweed: Columbia Gorge CWMA
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Perfil de las plantas Polygonum cuspidatum (Centidonia japonesa)
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Perfil de Knotweed - Estado de Oregón
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Knotweed- Junta de Control de Malezas Nocivas del Estado de Washington
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Ficha técnica del compendio de especies invasoras - Fallopia japonica (Centidonia japonesa)
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Maleza nociva del condado de King: Mejores prácticas de gestión del knotweed japonés
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NRCS Pest Management – Invasive Plant Control Japanese Knotweed
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Control de Knotweed en el noroeste del Pacífico
