e-journal

A Glyphosate-Resistant Biotype of Annual Bluegrass in Tennessee

---

Glyphosate is regularly used to control annual bluegrass populations in dormant bermudagrass turf. A population of annual bluegrass not controlled by glyphosate at 840 g ha-1 (glyphosate resistant, GR) was identified on a golf course in Humboldt, TN in 2010. Mature tillers of GR plants were established in a greenhouse and treated with glyphosate at 0, 210, 420, 840, 1,680, 3,360, and 6,720 g ha-1. Mature tillers of a biotype known to be susceptible to glyphosate (SS) were also established in the greenhouse and subjected to the same treatments. At 14 d after treatment (DAT), glyphosate controlled the SS biotype > 95% at rates > 420 g ha-1. Comparatively, the GR biotype was only controlled 76% with glyphosate at 6,720 g ha-1. The rates required to provide 50% control (I50 values) for SS and GR biotypes were 236 and 2,812 g ha-1 respectively, resulting in a resistance factor of 12. Photochemical efficiency (Fv/Fm) values on SS plants treated with glyphosate at > 210 g ha-1 measured 0.000 at 14 DAT, whereas Fv/Fm values on GR plants were not significantly different from the untreated control with glyphosate rates ≤ 840 g ha-1 on the same date. In laboratory experiments, the SS biotype accumulated greater shikimate concentrations than the GR biotype 3 to 6 DAT. Future research should evaluate strategies for managing GR and SS annual bluegrass with alternative modes of action.

Nomenclature: Annual bluegrass, Poa annua L.; bermudagrass, Cynodon dactylon L. Pers.; glyphosate; photochemical efficiency.

Key words: bermudagrass, dormant, herbicide resistance, golf course, turf, weed control.

---

Ketersediaan

Tidak ada salinan data

Informasi Detail

Judul Seri

Weed Science

No. Panggil

-

Penerbit

New York : Weed Science Society America., 2012

Deskripsi Fisik

Weed Science 2012 60:97–100

Bahasa

English

ISBN/ISSN

DOI: 10.1614/WS-D-11

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

2012 60

Subjek

PERTANIAN.
ILMU GULMA

Info Detail Spesifik

-

Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

Komentar

---

Anda harus masuk sebelum memberikan komentar