Posts Tagged ‘Japanese knotweed’

National Invasive Species Awareness Week 2018 — Japanese Knotweed

Posted on: February 26th, 2018 by Samantha Kahl

Feb­ru­ary 26th marks the begin­ning of Nation­al Inva­sive Species Aware­ness Week! Through­out this week, until March 2nd, we will be explor­ing dif­fer­ent inva­sive species present with­in our water­shed. To start off this week, we must first ask our­selves, “What is an inva­sive species?”. An inva­sive species is a species that is non-native to an ecosys­tem and has the poten­tial to cause envi­ron­men­tal harm to an area. Inva­sive species often out-com­pete native species, giv­ing native species lit­tle chance for sur­vival; this includes both ter­res­tri­al and aquat­ic plants and ani­mals.

Japanese Knotweed within the Watershed

Japan­ese Knotweed with­in the Water­shed

The first inva­sive species we’ll look at is Japan­ese Knotweed. This mon­ster of a plant came to the U.S. as an orna­men­tal plant in the 1800’s from East­ern Asia. Knotweed is iden­ti­fied by its large heart-shaped leaves, hol­low bam­boo-like stalks, and clus­ters of white or cream col­ored flow­ers. It is often found near streams or rivers and it can with­stand low-light, high tem­per­a­tures, drought, and poor soil qual­i­ty, mak­ing this inva­sive resilient to many dif­fer­ent types of envi­ron­ments. Knotweed can grow up to 15 feet tall, with deep rhi­zomes (roots) extend­ing into the ground, mak­ing it very dif­fi­cult and time­ly to erad­i­cate.

Photo of Japanese Knotweed leaves & flowers courtesy of http://www.nyis.info

Pho­to of Japan­ese Knotweed leaves & flow­ers cour­tesy of http://www.nyis.info

Col­lab­o­ra­tion and coor­di­na­tion from as many peo­ple and orga­ni­za­tions as pos­si­ble is the best way to tack­le Japan­ese Knotweed. In order to con­trol it, one must be dili­gent. The Catskill Region­al Inva­sive Species Part­ner­ship (CRISP) rec­om­mends con­tin­u­ous man­u­al removal of Knotweed approx­i­mate­ly 2–3 times each year for at least 3 years, or until it is erad­i­cat­ed. Accord­ing to New York Inva­sive Species Infor­ma­tion (NYIS), mow­ing or cut­ting of Japan­ese Knotweed will actu­al­ly spread the plant, rather than con­tain it. For those who would like to use her­bi­cides on large vol­umes of Knotweed, call your local CCE or Soil and Water Con­ser­va­tion Dis­trict office to get more infor­ma­tion on chem­i­cal reg­u­la­tions and safe­ty pre­cau­tions in your region.

 

Videos regard­ing Inva­sive Species in New York State:

Pre­vent the Spread of Inva­sive Species

Get to Know Inva­sive Plants

 

Fol­low us this week as we uncov­er more inva­sive species in our Ashokan Water­shed! Face­bookTwit­terInsta­gram

 

 

 

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It is Invasive Species Awareness Week!

Posted on: July 15th, 2016 by Caroline Stupple

Inva­sive Species Aware­ness Week (ISAW) is a col­lab­o­ra­tion between mul­ti­ple region­al, state, and fed­er­al agen­cies. ISAW seeks to enhance aware­ness of inva­sive species and pro­vide peo­ple with tools for man­age­ment. Local­ly, through­out the Catskill area, the Catskill Region­al Inva­sive Species Part­ner­ship (CRISP) pro­vides edu­ca­tion­al mate­r­i­al and sup­port for inva­sive species removal. A focal species for man­age­ment has been Japan­ese knotweed.

Japan­ese Knotweed was intro­duced to the Unit­ed States some­time in the late 1800s and was tout­ed as an excel­lent gar­den orna­men­tal plant. It was soon iden­ti­fied as an inva­sive species due to its aggres­sive spread through­out and beyond the region of intro­duc­tion and its ten­den­cy to out­com­pete native plant species.  In Ulster Coun­ty, though we are not alone in this strug­gle, we have seen the tremen­dous spread of knotweed espe­cial­ly along stream sides. Its migra­tion is high­ly effi­cient along these buffer zones due to its abil­i­ty to reestab­lish a new stand from a small root frag­ment washed down­stream.

 

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Japan­ese knotweed stand along left side of stream. Pho­to by Ulster Coun­ty Soil and Water Con­ser­va­tion Dis­trict.

 

Knotweed can be iden­ti­fied by its large heart-shaped leaves, hol­low bam­boo-like stalks, and the clus­ter of white or cream col­ored flow­ers. Stands of knotweed are immense­ly dif­fi­cult and time con­sum­ing to erad­i­cate, how­ev­er, it can be man­aged with vig­i­lance and patience. Among oth­er man­age­ment plans, CRISP sug­gests rou­tine and con­tin­u­ous removal of knotweed stands or her­bi­cide injec­tions into the stocks.  Man­u­al removal of knotweed can be time con­sum­ing, as removals must reoc­cur 2–3 times every year for 3 or more years. Addi­tion­al­ly, due to the ease with which knotweed spreads the herba­ceous mate­r­i­al must be dis­posed of prop­er­ly; dis­pos­al includes let­ting the mate­r­i­al dry out and burn­ing it when dried. Injec­tion of the her­bi­cide is also time con­sum­ing and may not be prac­ti­cal for a large knotweed stand. The her­bi­cide must be inject­ed into each stalk at approx­i­mate­ly the 3rd node on the stalk dur­ing the late sum­mer and ear­ly fall months.

The bat­tle against Japan­ese knotweed is best fought on many fronts and with coor­di­na­tion and efforts from as many peo­ple as pos­si­ble. If you would like to know more about how you can help with Japan­ese knotweed erad­i­ca­tion and man­age­ment in your area, or would like to learn more about oth­er inva­sive species in the area, please click here to be direct­ed to the CRISP web­site. If you would like to learn more about the annu­al Inva­sive Species Aware­ness Week and to get more infor­ma­tion about New York inva­sive species, please click here.

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