FIELD CONFIRMATION OF AN INDEX FOR PREDICTING YIELD LOSS OF WHEAT AND BARLEY DUE TO WILD OAT COMPETITION

1979 ◽  
Vol 59 (1) ◽  
pp. 243-244 ◽  
Author(s):  
W. M. HAMMAN
Keyword(s):  
Triticum Aestivum ◽  
Yield Loss ◽  
Triticum Aestivum L ◽  
Avena Fatua ◽  
Western Canada ◽  
Wild Oat ◽  
Field Scale ◽  
Hordeum Vulgare L ◽  
Wild Oats ◽  
Actual Yield

Indices of competition of 0.0339 for wild oats (Avena fatua L.) in wheat (Triticum aestivum L. emend Thel.) and 0.0230 for wild oats in barley (Hordeum vulgare L.) as developed by Dew (1972) were confirmed. Actual yield loss determinations were made by utilizing data collected from herbicide-treated (considered wild oat-free) and non-treated areas on field-scale trials scattered across Western Canada.

EFFECTS OF POST-EMERGENCE WILD OAT HERBICIDES ON THE TRANSPIRATION OF WILD OATS

1977 ◽  
Vol 57 (1) ◽  
pp. 127-132 ◽  
Author(s):  
M. P. SHARMA ◽  
W. H. VANDEN BORN ◽  
D. K. McBEATH
Keyword(s):  
Triticum Aestivum ◽  
Acid Methyl Ester ◽  
Dry Weight ◽  
Triticum Aestivum L ◽  
Avena Fatua ◽  
Wild Oat ◽  
Hordeum Vulgare L ◽  
Wild Oats ◽  
Acid Methyl ◽  
Foliar Treatment

Transpiration of wild oat (Avena fatua L.) plants was markedly reduced after foliar treatment with barban (4-chloro-2-butynyl-m-chlorocarbanilate), asulam (methyl sulfanylcarbamate), dichlorfop methyl (4-(2′,4′-dichlorophenoxy)-phenoxypropionic acid methyl ester), difenzoquat (1,2-dimethyl-3,5-diphenyl-1 H-pyrazolium) or benzoylprop ethyl (ethyl-N-benzoyl-N(3,4-dichlorophenyl)-2-aminopropionate). Suppression of transpiration increased with increasing herbicide rates. Difenzoquat and dichlorfop methyl at 1.12 kg/ha reduced transpiration by more than 50% within 2 days after spraying. Barban, asulam and benzoylprop ethyl did not reduce transpiration to this level until about 12 days after spraying. When wild oats and barley (Hordeum vulgare L.) or wheat (Triticum aestivum L.) were grown together, removal of the weed with these herbicides resulted in significantly heavier barley and wheat plants with more tillers per plant than in the untreated control. The earlier removal of wild oat competition with dichlorfop methyl and difenzoquat treatments resulted in the production of more dry weight and culms per plant of barley and wheat than with the slower-acting barban and benzoylprop ethyl.

CONTROL OF WILD OATS IN WHEAT WITH BARBAN, DICLOFOP METHYL, FLAMPROP METHYL AND DIFENZOQUAT

1984 ◽  
Vol 64 (4) ◽  
pp. 1019-1021 ◽  
Author(s):  
K. J. KIRKLAND ◽  
P. A. O’SULLIVAN
Keyword(s):  
Triticum Aestivum ◽  
Wheat Yield ◽  
Triticum Aestivum L ◽  
Avena Fatua ◽  
Growth Stages ◽  
Wild Oat ◽  
Wild Oats

The efficacy of diclofop methyl, flamprop methyl, difenzoquat, and barban on wild oats (Avena fatua L.) in wheat (Triticum aestivum L.) was tested in the field at Scott and Lacombe from 1978 to 1982. The four herbicides were applied at recommended rates and growth stages. Diclofop methyl consistently caused the greatest reduction in wild oat culms and plant weights and resulted in the largest wheat yield increases. Diclofop methyl, flamprop methyl and difenzoquat consistently produced yield increases over the untreated control.Key words: Wild oats, wheat, barban, diclofop methyl, flamprop methyl, difenzoquat

Competitiveness of Canada prairie spring wheats with wild oat (Avena fatua L.)

1991 ◽  
Vol 71 (4) ◽  
pp. 1089-1092 ◽  
Author(s):  
K. J. Kirkland ◽  
J. H. Hunter
Keyword(s):  
Triticum Aestivum ◽  
Key Words ◽  
Biomass Production ◽  
Spring Wheat ◽  
Plant Biomass ◽  
Triticum Aestivum L ◽  
Avena Fatua ◽  
Wild Oat ◽  
Four Levels ◽  
Actual Yield

Three spring wheat (Triticum aestivum L.) genotypes (Neepawa, a hard red spring, and HY320 and HY355 both Canada Prairie Spring wheats) were subjected to four levels of wild oat density at two locations over 4 yr to assess the effects of wild oat competition on biomass production, culm formation and yield. Wheat biomass and culm production were reduced at all wild oat density levels in each of the three cultivars. There were no significant differences among cultivars. In general, yields of all cultivars were reduced as wild oat density levels increased. Actual yield reductions at comparable wild oat densities tended to be greater at Regina than at Scott. There was a significant cultivar-by-density interaction for yield with yield reductions in HY320 > HY355 > Neepawa. Key words: Triticum aestivum, wheat (spring), wild oat density, competition, plant biomass, culms

Barban Selectivity for Wild Oat in Wheat

Weed Science ◽  
1974 ◽  
Vol 22 (5) ◽  
pp. 476-480 ◽  
Author(s):  
Robert W. Neidermyer ◽  
John D. Nalewaja
Keyword(s):  
Triticum Aestivum ◽  
Air Temperature ◽  
Leaf Blade ◽  
Plant Morphology ◽  
Treatment Temperature ◽  
Avena Fatua ◽  
Post Treatment ◽  
Wild Oat ◽  
Wheat Growth ◽  
Wild Oats

The response of wheat (Triticum aestivum L.) and wild oat (Avena fatua L.) to barban (4-chloro-2-butynyl-m-chlorocarbanilate) was studied as influenced by plant morphology and air temperature after application. Growth of wheat and wild oat seedlings was reduced by barban at 0.3 μg and 0.6 μg applied to the first node, respectively. Barban application to the base and midpoint of the first leaf blade required a lower dose to reduce wild oat growth than wheat growth. Increased tillering occurred from barban injury to the main culm in wheat. Wheat and wild oat susceptibility to barban increased as the post-treatment temperature decreased from 32 to 10 C. Barban selectivity for wild oats in wheat was greater at 27 and 21 C than at 16 and 10 C.

CONTROL OF WILD OAT WITH TRIALLATE IN A SPRING WHEAT CONSERVATION TILLAGE SYSTEM

1986 ◽  
Vol 66 (1) ◽  
pp. 181-184 ◽  
Author(s):  
S. J. CARLSON ◽  
L. A. MORROW
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Conservation Tillage ◽  
Wheat Yield ◽  
Triticum Aestivum L ◽  
Avena Fatua ◽  
Wild Oat ◽  
Minimum Tillage ◽  
Tillage System

Triallate granules were applied at 2.8 kg/ha without incorporation either immediately before or after planting into standing spring wheat (Triticum aestivum L. ’Fielder’ and ’Dirkwin’) stubble. The triallate granules controlled wild oat (Avena fatua L.), and resulted in increased spring wheat yield. Difenzoquat or diclofop-methyl application also increased wheat yields.Key words: Triallate, oat (wild), conservation tillage, minimum tillage, wheat (spring)

EFFECTS OF COMBINED APPLICATIONS OF TRIALLATE OR TRIFLURALIN WITH SOLUTION NITROGEN ON WHEAT, WILD OATS AND GREEN FOXTAIL

1977 ◽  
Vol 57 (2) ◽  
pp. 479-484 ◽  
Author(s):  
J. R. MOYER ◽  
R. D. DRYDEN
Keyword(s):  
Triticum Aestivum ◽  
Nitrogen Content ◽  
Nitrogen Fertilizer ◽  
Good Control ◽  
Triticum Aestivum L ◽  
Avena Fatua ◽  
Setaria Viridis ◽  
Wheat Grain ◽  
Wild Oats ◽  
Green Foxtail

Tank mixtures of solution nitrogen, triallate [S-(2,3,3-trichloroallyl)diisopropyl-thiocarbamate] and/or trifluralin [α,α,α,-trifluro-2, 6-dinitro-N, N-dipropyl-p-toluidine] were evaluated for the control of wild oats (Avena fatua L.) and/or green foxtail (Setaria viridis (L.) Beauv.). The response of wheat (Triticum aestivum L.) cv. Neepawa to solution nitrogen applied alone or in combination with triallate and/or trifluralin were evaluated. Good control of wild oats and green foxtail was obtained with a tank mixture of solution nitrogen, trifluralin at 1.38 kg/ha, and triallate at 1.65 kg/ha. Tank mixtures of triallate at 1.65 kg/ha with solution nitrogen controlled wild oats. Trifluralin at 1.38 kg/ha with solution nitrogen controlled wild oats and green foxtail. Control of green foxtail and wild oats resulted in increased wheat yields, higher nitrogen content in wheat grain, and a more efficient use of applied nitrogen fertilizer. The response of wheat to nitrogen was similar when nitrogen was applied in tank mixes with herbicides or with water to hand-weeded plots.

Competition of Wild Oat in Wheat and Barley

Weed Science ◽  
1968 ◽  
Vol 16 (4) ◽  
pp. 505-508 ◽  
Author(s):  
Allyn R. Bell ◽  
John D. Nalewaja
Keyword(s):  
Triticum Aestivum ◽  
Hordeum Vulgare ◽  
Yield Loss ◽  
Wheat Yield ◽  
Avena Fatua ◽  
Yield Reduction ◽  
Wild Oat ◽  
Phosphorus Fertilizer ◽  
Nitrogen And Phosphorus ◽  
Percent Protein

Wild oat (Avena fatua L.) competition increased the losses in yield of both wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.) with increased densities of seedlings. At Fargo in 1965, wild oat densities of 70 and 160 seedlings/sq yd reduced the wheat yield 22.1% and 39.1%, respectively, compared to the wild oat-free check. Similar wild oat densities reduced the barley yield 6.5% and 25.9%, respectively. The addition of nitrogen and phosphorus fertilizer reduced the yield loss caused by wild oat 2 out of 3 years of the experiment. Although a considerable yield reduction occurred in barley and wheat, percent protein and seed size were not influenced noticeably.

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