{"id":5592,"date":"2020-08-20T08:17:30","date_gmt":"2020-08-20T06:17:30","guid":{"rendered":"https:\/\/dev.asleman.org\/?post_type=60_secondes&amp;p=5592"},"modified":"2020-08-20T08:17:30","modified_gmt":"2020-08-20T06:17:30","slug":"n50-renouee-du-japon","status":"publish","type":"60_secondes","link":"https:\/\/asleman.org\/en\/60_secondes\/n50-renouee-du-japon\/","title":{"rendered":"No.50: Japanese knotweed"},"content":{"rendered":"<p>Japanese Knotweed (Reynoutria japonica) is a species of herbaceous perennial plant in the Polygonaceae family, native to eastern Asia. It has been \ud835\udc22\ud835\udc26\ud835\udc29\ud835\udc28\ud835\udc2b\ud835\udc2d\ud835\udc1e\u0301\ud835\udc1e \ud835\udc1e\ud835\udc27 \ud835\udc04\ud835\udc2e\ud835\udc2b\ud835\udc28\ud835\udc29\ud835\udc1e \ud835\udc1a\ud835\udc2e \ud835\udc17\ud835\udc08\ud835\udc17\ud835\udc1e \ud835\udc2c\ud835\udc22\ud835\udc1e\u0300\ud835\udc1c\ud835\udc25\ud835\udc1e \ud835\udc1d'\ud835\udc00\ud835\udc2c\ud835\udc22\ud835\udc1e used as an ornamental plant. Indeed, its bamboo-like stem and bright green, heart-shaped leaves were a big hit in gardens. Since then, humans have encouraged its spontaneous spread through certain activities, such as backfilling building sites. Particularly dynamic, it thrives along the banks of rivers and lakes, especially in brightly lit areas. The \ud835\udc1e\ud835\udc27\ud835\udc2f\ud835\udc22\ud835\udc2b\ud835\udc28\ud835\udc27\ud835\udc27\ud835\udc1e\ud835\udc26\ud835\udc1e\ud835\udc27\ud835\udc2d\ud835\udc2c \ud835\udc1a\ud835\udc2b\ud835\udc2d\ud835\udc22\ud835\udc1f\ud835\udc22\ud835\udc1c\ud835\udc22\ud835\udc1a\ud835\udc25\ud835\udc22\ud835\udc2c\ud835\udc1e\u0301\ud835\udc2c (rockfill, road embankments, railway embankments, etc.) are favourable to its development.) are favourable to its development, which can be observed in both lowland and mountain regions. However, despite all its advantages, it does have one drawback: it is a \ud835\udc29\ud835\udc25\ud835\udc1a\ud835\udc27\ud835\udc2d\ud835\udc1e \ud835\udc27\ud835\udc28\ud835\udc27-\ud835\udc22\ud835\udc27\ud835\udc1d\ud835\udc22\ud835\udc20\ud835\udc1e\u0300\ud835\udc27\ud835\udc1e \ud835\udc2d\ud835\udc2b\ud835\udc1e\u0300\ud835\udc2c \ud835\udc1e\ud835\udc27\ud835\udc2f\ud835\udc1a\ud835\udc21\ud835\udc22\ud835\udc2c\ud835\udc2c\ud835\udc1a\ud835\udc27\ud835\udc2d\ud835\udc1e.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"807\" height=\"605\" src=\"https:\/\/dev.asleman.org\/wp-content\/uploads\/2020\/08\/50.2.jpg\" alt=\"\" class=\"wp-image-5594\" srcset=\"https:\/\/asleman.org\/wp-content\/uploads\/2020\/08\/50.2.jpg 807w, https:\/\/asleman.org\/wp-content\/uploads\/2020\/08\/50.2-300x225.jpg 300w, https:\/\/asleman.org\/wp-content\/uploads\/2020\/08\/50.2-768x576.jpg 768w\" sizes=\"(max-width: 807px) 100vw, 807px\" \/><\/figure>\n\n\n\n<p>In Switzerland, it is blacklisted as an invasive plant with a degree of \ud835\udfcf\ud835\udfce \ud835\udc2c\ud835\udc2e\ud835\udc2b \ud835\udfcf\ud835\udfce \ud835\udc1d'\ud835\udc2e\ud835\udc2b\ud835\udc20\ud835\udc1e\ud835\udc27\ud835\udc1c\ud835\udc1e \ud835\udc1d\ud835\udc1e \ud835\udc25\ud835\udc2e\ud835\udc2d\ud835\udc2d\ud835\udc1e because it represents a real \ud835\udc1d\ud835\udc1a\ud835\udc27\ud835\udc20\ud835\udc1e\ud835\udc2b \ud835\udc29\ud835\udc28\ud835\udc2e\ud835\udc2b \ud835\udc25\ud835\udc1a \ud835\udc1b\ud835\udc22\ud835\udc28\ud835\udc1d\ud835\udc22\ud835\udc2f\ud835\udc1e\ud835\udc2b\ud835\udc2c\ud835\udc22\ud835\udc2d\ud835\udc1e\u0301 \ud835\udc25\ud835\udc28\ud835\udc1c\ud835\udc1a\ud835\udc25\ud835\udc1e : its vegetative reproduction and the fact that it suffers virtually no parasitic attack encourage its growth, which can reach \ud835\udc23\ud835\udc2e\ud835\udc2c\ud835\udc2a\ud835\udc2e'\ud835\udc1a\u0300 \ud835\udfd6 \ud835\udc1c\ud835\udc1e\ud835\udc27\ud835\udc2d\ud835\udc22\ud835\udc26\ud835\udc1e\u0300\ud835\udc2d\ud835\udc2b\ud835\udc1e\ud835\udc2c \ud835\udc29\ud835\udc1a\ud835\udc2b \ud835\udc23\ud835\udc28\ud835\udc2e\ud835\udc2b! Thus, by forming very dense bushes, capturing all the surrounding light, it \ud835\udc1e\ud835\udc26\ud835\udc29\ud835\udc1e\u0302\ud835\udc1c\ud835\udc21\ud835\udc1e \ud835\udc25\ud835\udc1e \ud835\udc1d\ud835\udc1e\u0301\ud835\udc2f\ud835\udc1e\ud835\udc25\ud835\udc28\ud835\udc29\ud835\udc29\ud835\udc1e\ud835\udc26\ud835\udc1e\ud835\udc27\ud835\udc2d \ud835\udc1d\ud835\udc1e\ud835\udc2c \ud835\udc1a\ud835\udc2e\ud835\udc2d\ud835\udc2b\ud835\udc1e\ud835\udc2c \ud835\udc1e\ud835\udc2c\ud835\udc29\ud835\udc1e\u0300\ud835\udc1c\ud835\udc1e\ud835\udc2c plants found around. What's more, it emits toxic substances through its roots that restrict the growth of native plants. The Association pour la Sauvegarde du L\u00e9man began the fight against this scourge in spring 2013, initially on the shores of Geneva, as part of \ud835\udc2c\ud835\udc28\ud835\udc27 \ud835\udc1a\ud835\udc1c\ud835\udc2d\ud835\udc22\ud835\udc28\ud835\udc27 \u00ab\ud835\udc07\ud835\udc1a\ud835\udc25\ud835\udc2d\ud835\udc1e \ud835\udc1a\ud835\udc2e\ud835\udc31 \ud835\udc11\ud835\udc1e\ud835\udc27\ud835\udc28\ud835\udc2e\ud835\udc1e\u0301\ud835\udc1e\ud835\udc2c\u00bb. Thanks to the regular help of volunteers who intervene between April and October, a \ud835\udc2b\ud835\udc1e\u0301\ud835\udc20\ud835\udc2b\ud835\udc1e\ud835\udc2c\ud835\udc2c\ud835\udc22\ud835\udc28\ud835\udc27 \ud835\udc1d\ud835\udc1e\ud835\udc2c \ud835\udc1f\ud835\udc28\ud835\udc32\ud835\udc1e\ud835\udc2b\ud835\udc2c has been noted after 6 years of control. As of 2017, the action has been extended to the other cantons bordering Lake Geneva to provide sustainable assistance to municipalities on Lake Geneva facing colonisation by knotweed. The ASL organises and coordinates uprooting operations to maximise their impact and contain the growth of knotweed, or even eradicate certain areas. As well as being proven effective, the method used preserves the native vegetation. In 2019, \u00abHalte aux renou\u00e9e\u00bb again extended to new foci in the cantons of Geneva and Vaud, but also in Valais and Haute-Savoie. \ud835\udc00\ud835\udc22\ud835\udc27\ud835\udc2c\ud835\udc22 \ud835\udc25'\ud835\udc1a\ud835\udc27 \ud835\udc1d\ud835\udc1e\ud835\udc2b\ud835\udc27\ud835\udc22\ud835\udc1e\ud835\udc2b, \ud835\udfcf\ud835\udfd0,\ud835\udfd2 \ud835\udc2d\ud835\udc28\ud835\udc27\ud835\udc27\ud835\udc1e\ud835\udc2c \ud835\udc1d\ud835\udc1e \ud835\udc2b\ud835\udc1e\ud835\udc27\ud835\udc28\ud835\udc2e\ud835\udc1e\u0301\ud835\udc1e\ud835\udc2c \ud835\udc28\ud835\udc27\ud835\udc2d \ud835\udc1e\u0301\ud835\udc2d\ud835\udc1e\u0301 \ud835\udc1a\ud835\udc2b\ud835\udc2b\ud835\udc1a\ud835\udc1c\ud835\udc21\ud835\udc1e\u0301\ud835\udc1e\ud835\udc2c by the ASL and 132 outbreaks were treated. <\/p>\n\n\n\n<p>More information on the ASL website page dedicated to the action <a href=\"https:\/\/dev.asleman.org\/actions\/renouees\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\"><em>Stop Knotweed<\/em><\/a><\/p>","protected":false},"featured_media":5593,"template":"","mots-cles":[],"class_list":["post-5592","60_secondes","type-60_secondes","status-publish","has-post-thumbnail","hentry"],"acf":[],"ase":null,"_links":{"self":[{"href":"https:\/\/asleman.org\/en\/wp-json\/wp\/v2\/60_secondes\/5592","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/asleman.org\/en\/wp-json\/wp\/v2\/60_secondes"}],"about":[{"href":"https:\/\/asleman.org\/en\/wp-json\/wp\/v2\/types\/60_secondes"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/asleman.org\/en\/wp-json\/wp\/v2\/media\/5593"}],"wp:attachment":[{"href":"https:\/\/asleman.org\/en\/wp-json\/wp\/v2\/media?parent=5592"}],"wp:term":[{"taxonomy":"mots-cles","embeddable":true,"href":"https:\/\/asleman.org\/en\/wp-json\/wp\/v2\/mots-cles?post=5592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}