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. This article will assist with identification and provides recommendations for control, including a management calendar and treatment and timing table. 2 ... control in August and September when it is in bloom. 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. Figure 1. Plants can be dried and burned but make sure to check with local burning restrictions and if any permits are needed. Fallopia japonica (Houttuyn) Ronse-Decraene USDA PLANTS Symbol: FAJA2. japonica) growing vigorously along the banks of … From 2004 through 2010, three insects and 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). Japanese knotweed (Fallopia japonica var. Japanese knotweed ( Fallopia japonica ) is a weed that spreads rapidly. 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. It is a robust, bamboo-like perennial that spreads by long creeping rhizomes to form dense thickets. New colonies frequently arise from plant fragments transported in soil and … (7.6-10 cm) wide and broadly-ovate. Check with your county noxious weed control board about how to best dispose of plant parts. Eradication requires determination as it is very hard to remove by hand or eradicate with chemicals. Japanese knotweed is very similar control. 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. The semi-woody stem is hollow with enlarged nodes. There are few people who share the fondness for the plant displayed by its 19th century importers. 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. Its clustered spikes of creamy white flowers are distinctive and easy to spot. Fallopia japonica (Japanese knotweed) is a well-known invasive alien species in the UK and elsewhere in Europe and North America. 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