Predation of annual grass weed seeds in arable field margins

1993 ◽  
Vol 122 (2) ◽  
pp. 323-328 ◽  
Author(s):  
F. D. POVEY ◽  
H. SMITH ◽  
T. A. WATT
Keyword(s):  
Field Margins ◽  
Annual Grass ◽  
Arable Field ◽  
Weed Seeds ◽  
Grass Weed

The control of grass weeds in Townsville stylo (Stylosanthes humilis) experiments

1970 ◽  
Vol 10 (47) ◽  
pp. 795
Author(s):  
MJ Fisher ◽  
JR Ive
Keyword(s):  
Annual Grass ◽  
Stylosanthes Humilis ◽  
Weed Seeds ◽  
Heavy Burden ◽  
Excellent Control ◽  
Townsville Stylo ◽  
Grass Weed

Chlorthal applied at 4 lb a.i. an acre before simulated germinating rain gave excellent control of annual grass weeds in an old Townsville stylo (Stylosanthes humilis) sward carrying a heavy burden of grass weed seeds at Katherine, N.T. The technique was used successfully to control annual grass weeds in a long-term residual phosphate experiment. Trifluralin and dalapon were not effective.

The response of foraging bumblebees to successional change in newly created arable field margins

2004 ◽  
Vol 118 (3) ◽  
pp. 327-339 ◽  
Author(s):  
C Carvell ◽  
W.R Meek ◽  
R.F Pywell ◽  
M Nowakowski
Keyword(s):  
Field Margins ◽  
Arable Field ◽  
Successional Change

scholarly journals Molecular Basis for Resistance to Fluazifop-P-Butyl in Itchgrass (Rottboellia cochinchinensis) from Costa Rica

2016 ◽  
Vol 34 (1) ◽  
pp. 143-150 ◽  
Author(s):  
R. CASTILLO-MATAMOROS ◽  
A. BRENES-ANGULO ◽  
F. HERRERA-MURILLO ◽  
L. GÓMEZ ALPÍZAR.
Keyword(s):  
Costa Rica ◽  
Molecular Basis ◽  
Pcr Amplification ◽  
Costa Rican ◽  
Acetyl Coa Carboxylase ◽  
Annual Grass ◽  
San Jose ◽  
Weed Species ◽  
Rottboellia Cochinchinensis ◽  
Grass Weed

Rottboellia cochinchinensis is an annual grass weed species known as itchgrass, or "caminadora" in America´s Spanish speaking countries, and has become a major and troublesome weed in several crops. The application of fluazifop-P-butyl at recommended rates (125 g a.i. ha-1) was observed to be failing to control itchgrass in a field in San José, Upala county, Alajuela province, Costa Rica. Plants from the putative resistant R. cochinchinensis population survived fluazifop-P-butyl when treated with 250 g a.i. ha-1 (2X label rate) at the three- to four-leaf stage under greenhouse conditions. PCR amplification and sequencing of partial carboxyl transferase domain (CT) of the acetyl-CoA carboxylase (ACCase) gene were used to determine the molecular mechanism of resistance. A single non-synonymous point mutation from TGG (susceptible plants) to TGC (putative resistant plants) that leads to a Trp-2027-Cys substitution was found. This Trp-2027-Cys mutation is known to confer resistance to all aryloxyphenoxyproprionate (APP) herbicides to which fluazifop-P-butyl belongs. To the best of our knowledge, this is the first report of fluazifop-P-butyl resistance and a mutation at position 2027 for a Costa Rican R. cochinchinensis population.

scholarly journals Seed shattering phenology at soybean harvest of economically important weeds in multiple regions of the United States. Part 2: grass species

Weed Science ◽  
2020 ◽  
pp. 1-19
Author(s):  
Lauren M. Schwartz-Lazaro ◽  
Lovreet S. Shergill ◽  
Jeffery A. Evans ◽  
Muthukumar V. Bagavathiannan ◽  
Shawn C. Beam ◽  
...  
Keyword(s):  
The United States ◽  
Grass Species ◽  
Annual Grass ◽  
Weed Seed ◽  
Weed Species ◽  
Seed Shattering ◽  
Physiological Maturity ◽  
Rate Of Progression ◽  
Multiple Regions ◽  
Grass Weed

Abstract Seed shatter is an important weediness trait on which the efficacy of harvest weed seed control (HWSC) depends. The level of seed shatter in a species is likely influenced by agroecological and environmental factors. In 2016 and 2017, we assessed seed shatter of eight economically important grass weed species in soybean [Glycine max (L.) Merr.] from crop physiological maturity to four weeks after maturity at multiple sites spread across eleven states in the southern, northern, and mid-Atlantic U.S. From soybean maturity to four weeks after maturity, cumulative percent seed shatter was lowest in the southern U.S. regions and increased as the states moved further north. At soybean maturity, the percent of seed shatter ranged from 1 to 70%. That range had shifted to 5 to 100% (mean: 42%) by 25 days after soybean maturity. There were considerable differences in seed shatter onset and rate of progression between sites and years in some species that could impact their susceptibility to HWSC. Our results suggest that many summer annual grass species are likely not ideal candidates for HWSC, although HWSC could substantially reduce their seed output at during certain years.

Agri-environment schemes and butterflies: the utilisation of two metre arable field margins

2006 ◽  
Vol 16 (2) ◽  
pp. 465-474 ◽  
Author(s):  
R. G. Field ◽  
T. Gardiner ◽  
C. F. Mason ◽  
J. Hill
Keyword(s):  
Field Margins ◽  
Arable Field

Spatial distribution of annual grass weed populations in winter cereals

2003 ◽  
Vol 22 (4) ◽  
pp. 629-633 ◽  
Author(s):  
J.L Gonzalez-Andujar ◽  
M Saavedra
Keyword(s):  
Spatial Distribution ◽  
Annual Grass ◽  
Winter Cereals ◽  
Grass Weed

Factors influencing the plant and invertebrate diversity of arable field margins

2004 ◽  
Vol 102 (2) ◽  
pp. 219-231 ◽  
Author(s):  
E.J Asteraki ◽  
B.J Hart ◽  
T.C Ings ◽  
W.J Manley
Keyword(s):  
Field Margins ◽  
Invertebrate Diversity ◽  
Factors Influencing ◽  
Arable Field

Antagonism of Graminicide Activity on Annual Grass Species by Imazethapyr

1992 ◽  
Vol 6 (2) ◽  
pp. 333-338 ◽  
Author(s):  
Paul F. Myers ◽  
Harold D. Coble
Keyword(s):  
Weed Control ◽  
Field Experiments ◽  
Grass Species ◽  
Annual Grass ◽  
Antagonistic Interaction ◽  
Interaction Control ◽  
Grass Weed ◽  
Large Crabgrass

The interaction of imazethapyr and selected graminicides on annual grass control was studied in field experiments. Tank-mix combinations of imazethapyr with clethodim, fluazifop-P, quizalofop, or sethoxydim resulted in an antagonistic interaction. Control of large crabgrass, fall panicum, and broadleaf signalgrass by each graminicide decreased when tank-mixed with imazethapyr as compared with each graminicide applied alone. Sequential applications of imazethapyr, relative to each graminicide, successfully overcame the antagonism. Imazethapyr applied 5 d before or 1 d after each of the graminicides did not decrease grass weed control compared with each graminicide alone. Imazethapyr applied 3 or 1 d before, or the same day as the graminicides, generally decreased grass weed control.

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