Plant community response to integrated management of meadow hawkweed (Hieracium caespitosum) in the Pacific Northwest

John Wallace, Timothy S. Prather, Linda M. Wilson

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Meadow hawkweed is an invasive, perennial forb of upland forest openings, mountain meadows, permanent pastures, and abandoned farmlands in the Pacific Northwest. The objective of this study was to measure the plant community response, following meadow hawkweed control using selective herbicides and a single application of NPK fertilizer, across three levels of meadow hawkweed infestation in cleared forestlands that had been converted to pasture in northern Idaho. Clopyralid was applied to meadow hawkweed rosettes at a rate of 0.59l kg ae ha-1 (0.528 lb ac-1), and fertilizer (23-5-5, 1% Fe, 14% S) was broadcast following herbicide applications at two rates, 44 and 88 kg N ha-1. Foliar cover of meadow hawkweed, Idaho fescue, and other perennial grasses was measured in microplots at three levels of initial meadow hawkweed cover; <25%, 40 to 60%, and >75%. Clopyralid treatments resulted in excellent meadow hawkweed control 3 mo after treatment (MAT). Clopyralid alone appeared to shift the competitive balance in favor of perennial grasses, which increased 7, 44, and 65% above pretreatment levels in LOW, MED, and HIGH hawkweed cover plots, respectively, across fertilizer treatments. Meadow hawkweed cover remained <5% in clopyralid plots at 52 MAT. Fertilizer effects were confined to interactions between Idaho fescue and other perennial grasses.

Original languageEnglish (US)
Pages (from-to)268-275
Number of pages8
JournalInvasive Plant Science and Management
Volume3
Issue number3
DOIs
StatePublished - Jul 1 2010

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Pilosella caespitosa
plant communities
clopyralid
Festuca idahoensis
grasses
fertilizers
permanent grasslands
NPK fertilizers
pesticide application
meadows
agricultural land
fertilizer application
herbicides
pretreatment
pastures
mountains

All Science Journal Classification (ASJC) codes

  • Plant Science

Cite this

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title = "Plant community response to integrated management of meadow hawkweed (Hieracium caespitosum) in the Pacific Northwest",
abstract = "Meadow hawkweed is an invasive, perennial forb of upland forest openings, mountain meadows, permanent pastures, and abandoned farmlands in the Pacific Northwest. The objective of this study was to measure the plant community response, following meadow hawkweed control using selective herbicides and a single application of NPK fertilizer, across three levels of meadow hawkweed infestation in cleared forestlands that had been converted to pasture in northern Idaho. Clopyralid was applied to meadow hawkweed rosettes at a rate of 0.59l kg ae ha-1 (0.528 lb ac-1), and fertilizer (23-5-5, 1{\%} Fe, 14{\%} S) was broadcast following herbicide applications at two rates, 44 and 88 kg N ha-1. Foliar cover of meadow hawkweed, Idaho fescue, and other perennial grasses was measured in microplots at three levels of initial meadow hawkweed cover; <25{\%}, 40 to 60{\%}, and >75{\%}. Clopyralid treatments resulted in excellent meadow hawkweed control 3 mo after treatment (MAT). Clopyralid alone appeared to shift the competitive balance in favor of perennial grasses, which increased 7, 44, and 65{\%} above pretreatment levels in LOW, MED, and HIGH hawkweed cover plots, respectively, across fertilizer treatments. Meadow hawkweed cover remained <5{\%} in clopyralid plots at 52 MAT. Fertilizer effects were confined to interactions between Idaho fescue and other perennial grasses.",
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Plant community response to integrated management of meadow hawkweed (Hieracium caespitosum) in the Pacific Northwest. / Wallace, John; Prather, Timothy S.; Wilson, Linda M.

In: Invasive Plant Science and Management, Vol. 3, No. 3, 01.07.2010, p. 268-275.

Research output: Contribution to journalArticle

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