Herbicide Application Timing Critical to Control Exotic Hawkweeds

Herbicide Application Timing Critical to Control Exotic Hawkweeds

This article summarizes field studies established on meadow hawkweed at two sites near Santa, Idaho by Dr. Tim Prather, University of Idaho. Selective herbicides such as Milestone® specialty herbicide have shown to control hawkweeds and release grasses and desirable native forbs. Strategically timed herbicide applications can improve hawkweed control and promote establishment and maintenance of grass cover.


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Identification and Management of Invasive Knotweeds

Identification and Management of Invasive Knotweeds

There are four highly invasive knotweed species typically included in the complex including Japanese knotweed (Fallopia cuspidatum); giant knotweed (Fallopia sachalinense); Bohemian knotweed (Fallopia x bohemicum), a hybrid between giant and Japanese knotweed; and Himalayan knotweed (Persicaria wallichii). Knotweed control efforts typically require a combination of treatments over multiple years. 

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Biennial Thistle Management

Biennial Thistle Management

Several biennial thistles are problematic in North America including bull thistle (Cirsium vulgare), musk thistle (Carduus nutans), plumeless thistle (Carduus acanthoides), and Scotch thistle (Onopordum acanthium). 

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Saint Johnswort Biology, Impact and Management

Saint Johnswort Biology, Impact and Management

St. Johnswort, also known as Klamath weed or goatweed, was introduced to the United States as an ornamental and medicinal plan. This taprooted perennial now occurs in all but 2 states and is a challenge to land managers. Read more about the impacts, identification, and management using various methods. 

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Proper Herbicide Application Timing Maximizes Invasive Plant Control

Proper Herbicide Application Timing Maximizes Invasive Plant Control

Spring and early summer can be excellent times to control actively growing invasive plants with herbicides. Applying herbicides to the target plant at the optimum growth stage is important to maximize control. The following guidelines provide information on the best application timing and rate to control key invasive plants.

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What is Japanese Hop?

What is Japanese Hop?

Japanese hop (Humulus japonicas) is an annual, climbing or trailing vine that is native to eastern Asia. The plant was introduced to North America in the mid-to-late 1880s as an ornamental, and has become invasive in the eastern half of the United States and southeast Canadian provinces. Read about distribution, identification and management of the plant.

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Distinguishing Invasive Buckthorn from Native Alderleaf Buckthorn

Distinguishing Invasive Buckthorn from Native Alderleaf Buckthorn

Distinguishing between non-native and native buckthorn is important so that management efforts can be targeted appropriately. The following description separates two invasive buckthorns from native alderleaf buckthorn.

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Managing Tall Buttercup in Pastures and Natural Areas

Managing Tall Buttercup in Pastures and Natural Areas

Tall buttercup is an introduced perennial forb that is widespread throughout much of North America. It is invasive on irrigated and sub-irrigated pastures, meadows, stream banks, roadsides, and ditches. Integrating various management techniques—prevention along with herbicides, mechanical, manual, biological, and cultural methods—will optimize control of tall buttercup.

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Identification and Management of Brown, Black, and Meadow Knapweed

Identification and Management of Brown, Black, and Meadow Knapweed

Twenty two different knapweed species (Centaurea sp) are well established in North America. Most are introduced opportunists that have aggressively invaded natural areas, pastures, open woodlands, rights-of-way, and disturbed areas. Brown (C. jacea), black (C. nigra) and meadow knapweed (C. ×moncktonii) are long-lived perennial plants that are problematic in the United States and southern Canada.

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Embracing Drone Technology

Embracing Drone Technology

Invasive plants often establish and flourish on steep, rough terrain that is difficult to access. This makes early detection and management difficult and hazardous work. Nigel Davis, a commercial applicator in Helena, Montana, understands the challenges involved with treating invasive plants in natural areas with ground-based equipment. This makes early detection and management difficult and hazardous work. Nigel Davis, a commercial applicator in Helena, Montana, understands the challenges involved with treating invasive plants in natural areas with ground-based equipment.

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Identification and Management of Absinth Wormwood

Identification and Management of Absinth Wormwood

Absinth wormwood (Artemisia absinthium L.) is a perennial broadleaf plant introduced as an ornamental into North America from Europe in 1841. The plant escaped cultivation and is now widely distributed in the U.S. and Canada. This article describes the biology, ecology, identification, and management of absinth wormwood in natural areas.

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Identification and Management of Japanese Chaff Flower

Identification and Management of Japanese Chaff Flower

Japanese chaff flower (Achyranthes japonica) is a highly invasive, non-native, perennial plant in the Amaranth family. This article discusses distribution and management of this non-native plant.

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Control of Yellow Starthistle (Centaurea solstitialis) and Coast Fiddleneck (Amsinckia menziesii) with Aminopyralid (Milestone® specialty herbicide)

Control of Yellow Starthistle (Centaurea solstitialis) and Coast Fiddleneck (Amsinckia menziesii) with Aminopyralid (Milestone® specialty herbicide)

Guy B. Kyser, Vanelle Peterson, Steve B. Orloff, Steven D. Wright, Joseph M. DiTomaso (2011). Invasive Plant Science and Management: July-September, Vol. 4, No. 3, pp. 341-348. http://wssajournals.org/doi/abs/10.1614/IPSM-D-11-00002.1

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Integrated Management of Yellow Starthistle with Burning, Aminopyralid (Milestone® specialty herbicide), and Revegetation

Integrated Management of Yellow Starthistle with Burning, Aminopyralid (Milestone® specialty herbicide), and Revegetation

A summary of research presented as a poster–Integrated Management of Yellow Starthistle with Burning, Aminopyralid (Milestone), and Revegetation–at the Western Society of Weed Science Annual Meeting, Reno, NV 2012 by Guy B. Kyser,  Arthur W. Hazebrook, and Joe DiTomaso.

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Controlling Invasive Weeds in the Fall

Controlling Invasive Weeds in the Fall

Fall rain and cooler temperatures provide good conditions for extending the herbicide application season. The following species and many others can be effectively controlled in the fall. Follow the links for control recommendations for each species.

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Research and Management Tips for Controlling Yellow Starthistle

Research and Management Tips for Controlling Yellow Starthistle

This TechNote summarizes research on: 1) Integrating herbicides with other methods for managing yellow starthistle and 2) Controlling coast fiddleneck (Amsinckia menziesii)and yellow starthistle. Also included are practical management tips on herbicide rate and time of application to optimize yellow starthistle control.

 

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Yellow Starthistle Management with Herbicide

Yellow Starthistle Management with Herbicide

Herbicides play an important role in integrated management of yellow starthistle and can be used alone or in combination with other techniques such as timely mowing, grazing, burning, or use of biological control insects.

 

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