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. Japanese knotweed (Fallopia japonica) is an invasive perennial and noxious weed in PA. Fallopia japonica (Polygonum cuspidatum) Chris Evans, River to River CWMA, Bugwood.org Suzan Campbell, MNFI Suzan Campbell, MNFI Suzan Campbell, MNFI. 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. Fallopia japonica (Japanese knotweed) is a well-known invasive alien species in the UK and elsewhere in Europe and North America. 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. Eradication requires determination as it is very hard to remove by hand or eradicate with chemicals. The semi-woody stem is hollow with enlarged nodes. Over 186 species of insect her - bivores were recorded on F. japonica in Japan along with more than 40 fungal species. 2 ... control in August and September when it is in bloom. Leaves are alternate, 6 in. Its clustered spikes of creamy white flowers are distinctive and easy to spot. Fallopia japonica (Houttuyn) Ronse-Decraene USDA PLANTS Symbol: FAJA2. Japanese knotweed ( Fallopia japonica ) is a weed that spreads rapidly. (15.2 cm) long, 3-4 in. control of rhizome-forming invasive plants and emphasise the importance of scale appropriate empirical evidence to inform regulators when considering non-agricultural weed control. Japanese knotweed is a dense growing shrub reaching heights of 10 ft. (3 m). 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). It is a robust, bamboo-like perennial that spreads by long creeping rhizomes to form dense thickets. Japanese knotweed is very similar New colonies frequently arise from plant fragments transported in soil and … control. Polygonum cuspidatum (Fallopia japonica) Buckwheat family Japanese knotweed is often confused with its hybrid Bohemian knotweed and the closely related giant knotweed . Japanese knotweed (Fallopia japonica var. (7.6-10 cm) wide and broadly-ovate. Figure 1. There are few people who share the fondness for the plant displayed by its 19th century importers. Check with your county noxious weed control board about how to best dispose of plant parts. 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