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Tuesday, May 19, 2020 | History

1 edition of Impacts and potential impacts of spotted knapweed (Centaurea maculosa) on forest and range lands in western Montana found in the catalog.

Impacts and potential impacts of spotted knapweed (Centaurea maculosa) on forest and range lands in western Montana

E. Earl Willard

Impacts and potential impacts of spotted knapweed (Centaurea maculosa) on forest and range lands in western Montana

final report

by E. Earl Willard

  • 247 Want to read
  • 40 Currently reading

Published by Montana Forest & Conservation Experiment Station, University of Montana in Missoula, Mont .
Written in English

    Subjects:
  • Control,
  • Spotted knapweed

  • Edition Notes

    StatementE. Earl Willard, Donald J. Bedunah, C. Les Marcum
    ContributionsMarcum, C. Les, 1941-, Bedunah, Donald J., Montana Forest and Conservation Experiment Station
    The Physical Object
    Paginationxiv, 264 p. :
    Number of Pages264
    ID Numbers
    Open LibraryOL25509223M
    OCLC/WorldCa29924008

    Spotted knapweed, as the plant is more formally known, is a national menace, a weed of mass destruction. In Montana alone, it covers some million acres Author: Joe Alper. Spotted knapweed (Centaurea stoebe) is one of the worst weeds in the Western U.S., infesting over seven million acres. Even so, knapweed populations declined in Western Montana in the early s, coincident with severe drought. Further-more, the biocontrol agent, the knapweed root weevil (Cyphocleonus achates), was.

    Spotted Knapweed: Spotted knapweed (Centaurea maculosa) is an aggressive introduced weed species that rapidly invades pasture range and fallow land causing a decline in forage and crop releases a toxin that reduces the growth of other plants in the area. (2) It often displaces native vegetation. Spotted knapweed (Centaurea biebersteinii) Herbaceous, short-lived perennial, ’ tall. Persists as a rosette years before bolting. Flowering plants usually have 1 .

    Spotted knapweed (Centaurea biebersteinnii; formerly Centaurea stoebe L. ssp. micranthos) is a tap-rooted herbaceous perennial plant that spreads by seed. Spotted knapweed tolerates a wide range of temperature and moisture conditions, and is well adapted to open-forest, pastures, and CRP land in Wisconsin. Disturbed sites. Spotted knapweed, Centaurea stoebe ssp. micranthos Leslie J. Mehrhoff, University of Connecticut, Spotted knapweed was introduced into North America in the 's. Since then, it has spread to almost every state in the nation and has been disastrous to the rangelands of Idaho, Montana, Washington and Minnesota.


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Impacts and potential impacts of spotted knapweed (Centaurea maculosa) on forest and range lands in western Montana by E. Earl Willard Download PDF EPUB FB2

This banner text can have markup. web; books; video; audio; software; images; Toggle navigation. NUTRIENT VALUE The rosettes and young flowers of spotted knapweed have some nutritive value.

A study by Kelsey and Mihalovich () found that spotted knapweed collected before flowering contained neutral detergent fiber (% in dry weight), ether extract (%), crude protein (%), total non-structural carbohydrates ( %), ash ( to %). Impacts and potential impacts of spotted knapweed (Centaurea maculosa) on forest and range lands in western Montana: final report by Willard, E.

Earl; Marcum, C. Les,; Bedunah, Donald J; Montana Forest and Conservation Experiment StationPages: Centaurea maculosa, the spotted knapweed, is a species of Centaurea native to eastern Europe. This biennial or short-lived perennial plant usually has a stout taproot and/or pubescent stems when young.

It has deeply lobed leaves and vibrant pink flowers. The sepals have black tips that look like spots, which is the origin of its common : Asteraceae. Spotted Knapweed Identification and Management Background Information History and Impacts Spotted knapweed (Centaurea stoebe synonyms C.

biebersteinii and C. maculosa) is native to Central, Eastern and Southeastern Europe. Before it was considered to be a serious weed, it was spread in domestic hay and by human Size: KB. Spotted knapweed is an invasive noxious weed. It greatly decreases forage quality for livestock and wildlife on forest and rangelands, and lowers biodiversity.

Management of knapweed is difficult and little knowledge exists on what value various management strategies, including herbicides, have on restoring our native grasslands. To determine whether. Spotted knapweed is an aggressive, introduced weed species that rapidly invades pasture, rangeland and fallow land and causes a serious decline in forage and crop production.

The weed is a prolific seed producer with or more seeds per plant. Seed remains viable in the soil five years or more, so infestations may occur a number of years after vegetative plants have been. Spotted knapweed grows 12 to 60 inches tall, is more erect and has more limited branching than diffuse knapweed.

Dead spotted knapweed stems generally remain erect during the winter unless crushed by heavy snow-pack. Spotted knapweed is capable of producing flower buds until frost, but normally starts to senesce when soil water is de-pleted. Centaurea stoebe spotted knapweed or panicled knapweed is a species of Centaurea found in Northern Italy.

It is also an invasive species in the United States, and particularly widespread in dryer regions of the Pacific Northwest. This species along with Centaurea diffusa are the stereotypical "tumbleweed" of the West- breaking off at the top of the roots which facilitates its Family: Asteraceae.

Spotted knapweed infests a variety of natural and semi-natural habitats including barrens, fields, forests, prairies, meadows, pastures, and rangelands.

It outcompetes native plant species, reduces native plant and animal biodiversity, and has the potential to invade about half of all the rangeland (35 million acres) in Montana Size: 99KB.

Centaurea stoebe ssp. micranthos is an herbaceous biennial or perennial plant that readily invades open areas. Its name is derived from the black margins of the flower bract tips which give the flower heads a spotted look.

Foliage A basal rosette of deeply lobed leaves is. A single square foot of spotted knapweed can produce 5, seeds, which can remain viable for eight years or more.

As spotted knapweed seeds mature in late summer and fall, they can be spread on mowing equipment and in infested hay, seed, and gravel, or by hitchhiking on vehicles, other equipment, and even clothing.

Although wildlife and livestock rarely use spotted knapweed as forage, it can cause injuries or obstructions in the digestive tract. The plant exudes a chemical called catechin into the soil and prevents the establishment or germination of neighboring plants.

Researchers are currently studying the potential of catechin as a natural weed killer. The Spotted Knapweed. The species we are concerned with is another invasive species, the spotted knapweed. The spotted knapweed is a purple-flowered weed, which is not native to North America, but was introduced about years ago and has spread throughout both Canada and the United States.

Spotted knapweed has become a serious problem in the rangelands of the northwest United States. In recent years, the species has invaded relatively undisturbed natural areas in Wisconsin as well as heavily disturbed sites.

The extent of the invasion and the communities potentially affected are not well known. Until recently, spotted knapweed. A WEED REPORT from the book Weed Control in Natural Areas in the Western United States Spotted knapweed. mowed at the rosette stage will quickly recover, and mowing too late (after seed set) can disperse seed.

However, mowing at the late bud to early bloom stage will reduce seed production. Executive Office Montana Weed Control Association, Inc. PO BoxTwin Bridges, MT () | () (fax).

potential interactions, and are essential to docu-ment actual cumulative impacts (Seastedt and Pyˇsek ). Spotted knapweed (Centaurea stoebe L. subsp. micranthos [Gugler] Hayek [Asteraceae]) is an appropriate and important model system to evaluate the efficacy of biological control in eradication.

This regionally abundant invasiveCited by: Spotted knapweed (Centaurea stoebe L. subsp. micranthos [syn. biebersteinii, formally C. maculosa]) is a perennial native to Europe and was introduced to the United States as a seed contaminant of alfalfa in the late s.

Once introduced, spotted knapweed quickly became invasive and has infected over six million acres of rangelands and. Centaurea maculosa. is called “spotted” knapweed because of the “spots” under its flower.

Spotted knapweed is a perennial, which means the same plant can survive and reproduce for many years. Knapweeds are in the plant family Asteraceae, which contains other asters like sunflowers. Spotted knapweed plants often grow in dry. Spotted Knapweed (Centaurea stoebe) 1 Introduction Spotted knapweed (Centaurea stoebe) is a plant belonging to the sunflower (Asteraceae) family.

It is a perennial, polycarpic plant, meaning that it lives and flowers for several years, produces more than one stem and then dies.Knapweed Root Weevil Cyphocleonus achates.

We are OPEN for the season. This insect can safely be considered "The King" of spotted knapweed biocontrol. A large, conspicuous insect, it lays its eggs on the top of the knapweed's root crown. After .released for biological control of spotted knapweed in the United States (Story et al., ).

Most of these insects are available commercially or through state, federal, or private programs. Once insects are established they can be collected on site and re-distributed.

Bio-control insects may reduce spotted knapweed populations whereFile Size: KB.