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. Fallopia japonica (Polygonum cuspidatum) Chris Evans, River to River CWMA, Bugwood.org Suzan Campbell, MNFI Suzan Campbell, MNFI Suzan Campbell, MNFI. The semi-woody stem is hollow with enlarged nodes. Eradication requires determination as it is very hard to remove by hand or eradicate with chemicals. 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. Leaves are alternate, 6 in. 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). Plants can be dried and burned but make sure to check with local burning restrictions and if any permits are needed. Over 186 species of insect her - bivores were recorded on F. japonica in Japan along with more than 40 fungal species. Check with your county noxious weed control board about how to best dispose of plant parts. Fallopia japonica (Houttuyn) Ronse-Decraene USDA PLANTS Symbol: FAJA2. japonica) growing vigorously along the banks of … Figure 1. Its clustered spikes of creamy white flowers are distinctive and easy to spot. (15.2 cm) long, 3-4 in. Polygonum cuspidatum (Fallopia japonica) Buckwheat family Japanese knotweed is often confused with its hybrid Bohemian knotweed and the closely related giant knotweed . control of rhizome-forming invasive plants and emphasise the importance of scale appropriate empirical evidence to inform regulators when considering non-agricultural weed control. It is a robust, bamboo-like perennial that spreads by long creeping rhizomes to form dense thickets. Japanese knotweed (Fallopia japonica) is an invasive perennial and noxious weed in PA. 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. Japanese knotweed (Fallopia japonica var. 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. (7.6-10 cm) wide and broadly-ovate. This article will assist with identification and provides recommendations for control, including a management calendar and treatment and timing table. Japanese knotweed ( Fallopia japonica ) is a weed that spreads rapidly. Japanese knotweed is a dense growing shrub reaching heights of 10 ft. (3 m). 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