scholarly journals Mineral-Salt Supplement Does Not Attenuate Tall Larkspur (Delphinium Barbeyi) Toxicosis in Cattle

1998 ◽  
Vol 51 (5) ◽  
pp. 566 ◽  
Author(s):  
James A. Pfister ◽  
Carl D. Cheney ◽  
Dale R. Gardner ◽  
Gary D. Manners
Keyword(s):  
Mineral Salt ◽  
Delphinium Barbeyi ◽  
Tall Larkspur

The physiological effects and toxicokinetics of tall larkspur (Delphinium barbeyi) alkaloids in cattle.

2011 ◽  
pp. 557-565
Author(s):  
B. T. Green ◽  
K. D. Welch ◽  
J. A. Pfister ◽  
D. Cook ◽  
B. L. Stegelmeier ◽  
...  
Keyword(s):  
Physiological Effects ◽  
Delphinium Barbeyi ◽  
Tall Larkspur

Population Cycles of the Larkspur Mirid (Heteroptera: Miridae)

2000 ◽  
Vol 35 (4) ◽  
pp. 483-489 ◽  
Author(s):  
Michael H. Ralphs ◽  
Walker A. Jones
Keyword(s):  
Biological Control Agent ◽  
Population Cycles ◽  
Control Agent ◽  
Feeding Damage ◽  
Delphinium Barbeyi ◽  
Weather Patterns ◽  
Tall Larkspur ◽  
Low Levels ◽  
Extent Of Damage ◽  
Over Time

The larkspur mirid, Hoplomachus affiguratus Uhler, has been proposed as a biological control agent to damage tall larkspur, Delphinium barbeyi (L.) Huth, to prevent cattle from grazing it and becoming poisoned. The objective of this study was to monitor mirid populations and feeding damage to larkspur over time and determine if its population cycles are related to specific weather patterns. Individual larkspur plants were marked and the extent of damage estimated at 5 locations on 3 National Forests in Utah and Colorado. In years when mirid populations were high, damage to larkspur leaves ranged from 50 to 100% and greater than 75% of flowering heads aborted. In years and locations when its population was down, damage was minimal. The amount of larkspur damage was negatively correlated with the previous year's total precipitation and the previous September precipitation (r = −0.68 to −83) and was positively correlated with July and August temperature the previous year (r = 0.61 to 0.75). When mirid populations are high, damage levels appear to be sufficient to deter cattle grazing, but low levels of damage at the bottom of the cycle will likely not deter grazing.

Herbicides for Control of Tall Larkspur (Delphinium barbeyi)

Weed Science ◽  
1990 ◽  
Vol 38 (6) ◽  
pp. 573-577 ◽  
Author(s):  
Michael H. Ralphs ◽  
David L. Turner ◽  
Larry V. Mickelsen ◽  
John O. Evans ◽  
Steven A. Dewey
Keyword(s):  
Vegetation Types ◽  
Delphinium Barbeyi ◽  
Variable Control ◽  
Perennial Vegetation ◽  
Tall Larkspur

Control of tall larkspur on mountain rangelands would substantially reduce cattle poisoning. Several herbicides were evaluated for their control of tall larkspur in subalpine and aspen vegetation types. Glyphosate (2.2 kg ai ha−1) and picloram (2.2 kg ae ha−1) killed more than 88% of larkspur plants in both vegetation types. Clopyralid and triclopyr were ineffective at comparable rates. Metsulfuron (88 and 138 g ai ha−1) provided variable control. Glyphosate is nonselective and killed all perennial vegetation, except for Thurbers fescue and mountain brome in the aspen type. Picloram applied at 4.5 kg ha−1suppressed grasses on the subalpine site, but allowed grasses to increase at lower rates. All herbicides reduced forb cover.

Dormancy, Longevity, and Germination of Seed of Three Larkspurs and Western False Hellebore

Weed Science ◽  
1968 ◽  
Vol 16 (3) ◽  
pp. 381-384 ◽  
Author(s):  
M. Coburn Williams ◽  
Eugene H. Cronin
Keyword(s):  
Field Studies ◽  
Field Conditions ◽  
First Year ◽  
National Forest ◽  
Snow Melt ◽  
Delphinium Barbeyi ◽  
Moist Sand ◽  
Tall Larkspur ◽  
Second Year ◽  
Delphinium Occidentale

Dormancy, longevity, and germination of seed of tall larkspur (Delphinium barbeyi Huth), duncecap larkspur (Delphinium occidentale S. Wats.), low larkspur (Delphinium nelsonii Greene), and western false hellebore (Veratrum californicum Durand) were investigated. Field studies were conducted in the Cache National Forest in Idaho at 8,000 ft elevation. With the exception of 12 of 400 buried duncecap larkspur seed, seed of all species in the longevity study germinated or disintegrated the first year under field conditions. No sound or viable seed was found at the end of the second year. Dormancy of most seed was broken in 13 to 19 weeks when seed were held at 33 to 34 F in moist sand in the laboratory or when seed were in contact with moist unfrozen soil under snow. Under optimum field conditions, the majority of the seed germinated by late March. Seedlings were well-established before snow-melt in June.

The effect of administering multiple doses of tall larkspur (Delphinium barbeyi) to cattle1

2015 ◽  
Vol 93 (8) ◽  
pp. 4181-4188 ◽  
Author(s):  
K. D. Welch ◽  
B. T. Green ◽  
D. R. Gardner ◽  
D. Cook ◽  
J. A. Pfister
Keyword(s):  
Delphinium Barbeyi ◽  
Multiple Doses ◽  
Tall Larkspur

scholarly journals Toxic Alkaloid Levels in Tall Larkspur (Delphinium Barbeyi) in Western Colorado

1994 ◽  
Vol 47 (5) ◽  
pp. 355 ◽  
Author(s):  
James A. Pfister ◽  
Gary D. Manners ◽  
Dale R. Gardner ◽  
Michael H. Ralphs
Keyword(s):  
Delphinium Barbeyi ◽  
Western Colorado ◽  
Tall Larkspur

scholarly journals Nectar Yeasts in the Tall Larkspur Delphinium barbeyi (Ranunculaceae) and Effects on Components of Pollinator Foraging Behavior

PLoS ONE ◽  
2014 ◽  
Vol 9 (10) ◽  
pp. e108214 ◽  
Author(s):  
Robert N. Schaeffer ◽  
Cody R. Phillips ◽  
M. Catherine Duryea ◽  
Jonathan Andicoechea ◽  
Rebecca E. Irwin
Keyword(s):  
Foraging Behavior ◽  
Delphinium Barbeyi ◽  
Tall Larkspur

Individual Plant Control of Tall Larkspur (Delphinium barbeyi) with Tebuthiuron

2004 ◽  
Vol 18 (2) ◽  
pp. 248-251 ◽  
Author(s):  
Michael H. Ralphs ◽  
Lee Woolsey ◽  
James E. Bowns
Keyword(s):  
Organic Matter ◽  
Organic Matter Content ◽  
Clay Content ◽  
Matter Content ◽  
Individual Plant ◽  
Delphinium Barbeyi ◽  
Crown Cover ◽  
Tall Larkspur ◽  
Rate Controlled ◽  
Plant Control

A replicated field trial was conducted to determine the effective rates of tebuthiuron for control of individual tall larkspur plants in the mountains near Emery, UT, Cedar City, UT, and Yampa, CO. The size of larkspur plants was measured, and tebuthiuron was applied to the base of each plant at 0.1, 0.21, and 0.5 g product/1,000 cm2of foliar crown cover. Tebuthiuron at 0.21 g/ 1,000 cm2rate controlled 62% of the plants. Tebuthiuron at 0.5 g/1,000 cm controlled 78% of the plants (2.5 g for an average-sized plant of 5,000 cm2). The high clay content of the soils at Emery or high organic matter content of soils at Cedar City or Yampa did not adversely affect efficacy.

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