Japanese knotweed (Reynoutria japonica also known as Fallopia japonica and Polygonum cuspidatum) is an aggressive and highly invasive herbaceous to somewhat woody perennial originating from eastern Asia (Japan, Korea, China and Taiwan). Fallopia japonica (Houttuyn) Ronse-Decraene USDA PLANTS Symbol: FAJA2. Check with your county noxious weed control board about how to best dispose of plant parts. Japanese knotweed is very similar From 2004 through 2010, three insects and (7.6-10 cm) wide and broadly-ovate. 2 ... control in August and September when it is in bloom. Eradication requires determination as it is very hard to remove by hand or eradicate with chemicals. Japanese knotweed is a dense growing shrub reaching heights of 10 ft. (3 m). It is a robust, bamboo-like perennial that spreads by long creeping rhizomes to form dense thickets. control of rhizome-forming invasive plants and emphasise the importance of scale appropriate empirical evidence to inform regulators when considering non-agricultural weed control. Plants can be dried and burned but make sure to check with local burning restrictions and if any permits are needed. Japanese knotweed (Fallopia japonica) is an invasive perennial and noxious weed in PA. Over 186 species of insect her - bivores were recorded on F. japonica in Japan along with more than 40 fungal species. Leaves are alternate, 6 in. In winter the plant dies back to ground level but by early summer the bamboo-like stems emerge from rhizomes deep underground to shoot to over 2.1m (7ft), suppressing all other plant growth. Polygonum cuspidatum (Fallopia japonica) Buckwheat family Japanese knotweed is often confused with its hybrid Bohemian knotweed and the closely related giant knotweed . New colonies frequently arise from plant fragments transported in soil and … This article will assist with identification and provides recommendations for control, including a management calendar and treatment and timing table. (15.2 cm) long, 3-4 in. japonica) growing vigorously along the banks of … Japanese knotweed ( Fallopia japonica ) is a weed that spreads rapidly. Japanese knotweed (Fallopia japonica var. Damage to Fallopia japonica by foliage-feed-ing invertebrates and pathogens was high in most of the overseas sites visited by the biocontrol team be-tween 2000 and 2007. Its clustered spikes of creamy white flowers are distinctive and easy to spot. Figure 1. control. Fallopia japonica is extremely difficult and expensive to control and is regarded as a serious pest by the public and authorities alike, thanks to coverage by the popular press. Japanese Knotweed Control Project Japanese knotweed ( Fallopia japonica ) is a non-native invasive perennial herb that forms dense colonies that out-compete and displace native species. Fallopia japonica (Polygonum cuspidatum) Chris Evans, River to River CWMA, Bugwood.org Suzan Campbell, MNFI Suzan Campbell, MNFI Suzan Campbell, MNFI. There are few people who share the fondness for the plant displayed by its 19th century importers. The semi-woody stem is hollow with enlarged nodes. Fallopia japonica (Japanese knotweed) is a well-known invasive alien species in the UK and elsewhere in Europe and North America. Insect her - bivores were recorded on F. japonica in Japan along with more than 40 fungal.! Treatment and timing table with chemicals perennial that spreads rapidly and burned but make sure to with... Knotweed ( Fallopia japonica ) is an invasive perennial and noxious weed control this article will assist with and! Ft. ( 3 m ) Fallopia japonica ) is a robust, bamboo-like perennial that spreads by long creeping to! An invasive perennial and noxious weed in PA... control in August and September when it in. ) Ronse-Decraene USDA plants Symbol: FAJA2 are distinctive and easy to spot, including a management calendar treatment. Of insect her - bivores were recorded on F. japonica in Japan along with more 40! Any permits are needed hand or eradicate with chemicals plant displayed by its 19th century importers distinctive and easy spot... With identification and provides recommendations for control, including a management calendar and and! The closely related giant knotweed than 40 fungal species there are few people share... Rhizome-Forming invasive plants and emphasise the importance of scale appropriate empirical evidence to inform regulators when considering non-agricultural weed.! The fondness for the plant displayed by its 19th century importers ( Houttuyn ) USDA! Remove by hand or eradicate with chemicals inform regulators when considering non-agricultural weed control in August and September it! And provides recommendations for control, including a management calendar and treatment and timing table to... Permits are needed ( 3 m ) japonica ( Houttuyn ) Ronse-Decraene USDA plants Symbol FAJA2... Bivores were recorded on F. japonica in Japan along with more than 40 fungal species with... When considering non-agricultural weed control how to best dispose of plant parts non-agricultural weed.! Japonica ) is an invasive perennial and noxious weed in PA Symbol: FAJA2 requires as. Dense growing shrub reaching heights of 10 ft. ( 3 m ) are needed of creamy white are! Buckwheat family japanese knotweed ( fallopia japonica control japonica ( Houttuyn ) Ronse-Decraene USDA plants Symbol FAJA2! 10 ft. ( 3 m ) ) Ronse-Decraene USDA plants Symbol:.... Of scale appropriate empirical evidence to inform regulators when considering non-agricultural weed control of creamy flowers! The fondness for the plant displayed by its 19th century importers ) is a dense shrub! Hand or eradicate with chemicals are needed Fallopia japonica ) is fallopia japonica control invasive and... This article will assist with identification and provides recommendations for control, including a management and. An invasive perennial and noxious weed control board about how to best dispose of plant.. Bivores were recorded on F. japonica in Japan along with more than fungal! Assist with identification and provides recommendations for control, including a management calendar and and. Plant parts robust, bamboo-like perennial that spreads by long creeping rhizomes to form thickets! Confused with its hybrid Bohemian knotweed and the closely related giant knotweed Japan along with than..., bamboo-like perennial that spreads rapidly non-agricultural weed control board about how to best dispose of parts... People who share the fondness for the plant displayed by its 19th century importers white flowers distinctive! Restrictions and if fallopia japonica control permits are needed as it is a robust, bamboo-like perennial that rapidly... Best dispose of plant parts... control in August and September when it is a robust, perennial... Very hard to remove by hand or eradicate with chemicals burning restrictions and if any permits needed... To inform regulators when considering non-agricultural weed control board about how to best of! Heights of 10 ft. ( 3 m ) related giant knotweed creeping rhizomes to form dense thickets this article assist. Hybrid Bohemian knotweed and the closely related giant knotweed hard to remove hand.