Intervention effectmodel-written summary

Adding 2,4-D to glyphosate did not improve weed control in corn.

A claim from Combinations of Nonselective Herbicides for Difficult to Control Weeds in No-Till Corn,Zea mays, and Soybeans,Glycine max · 1988

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Taxon: cornZea mays subsp. mayse0
Treatment: addition of 2,4-D to glyphosatee0
Interactor: weedst0weed
Outcome: weed controle0
Direction: did not improvee0
Comparator: glyphosatee0

Not reportedMaterialGeneCompoundOrgan / stageSecond interactorSecond interactor roleSettingValueQualifier

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

*Zea mays subsp. mays* · TaxonDominicus Johannes Bergsma · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0
“For corn, the addition of 2,4-D to glyphosate did not improve weed control”
✓ located verbatim in the source · abstract, characters 366–440

t0
“Weeds in No-Till Corn”
✓ located verbatim in the source · title, characters 65–86

Title

Combinations of Nonselective Herbicides for Difficult to Control Weeds in No-Till Corn,Zea mays, and Soybeans,Glycine max

John S. Wilson; A. Douglas Worsham Weed Science 1988. doi:10.1017/s0043174500075561

Other claims from this paper (14)

Intervention effect Adding 2,4-D to paraquat improved horseweed control in corn.
Intervention effect Corn yield was higher with herbicide combinations than with nonselective herbicides alone.
Observation Initial weed control in soybeans was good.
Observation Weed regrowth was substantial in all paraquat alone soybean treatments, especially horseweed.
Intervention effect Adding 2,4-D to paraquat improved horseweed control.
Intervention effect Adding 2,4-D to paraquat improved tall morningglory control.
Intervention effect Adding linuron to paraquat improved horseweed and common ragweed control.
Intervention effect Adding diuron to paraquat improved horseweed and common ragweed control.
Intervention effect Adding 2,4-D to glyphosate improved tall morningglory control, but not control of other weed species.
Intervention effect After four weeks, glyphosate treatments generally controlled horseweed better than paraquat treatments.
Observation Paraquat plus linuron produced among the highest soybean yields.
Observation Paraquat plus diuron produced among the highest soybean yields.
Observation Glyphosate alone produced among the highest soybean yields.
Observation Glyphosate with 2,4-D produced among the highest soybean yields.

Record rev-a88ca3cc260cdda43e6ca128c0d36539c5fd5a3871f7bf17b8d8121556d0935f · schema claims-v0.9 · position 1 in the model’s answer

2,4-D · weed · Zea mays (maize)Positive and negative results

36 papers: 31 positive, 5 negative or no effect

4 papers in the same direction as this claim · 31 reporting no difference from an alternative

positive
Foramsulfuron mixed with 2,4-D + MCPA controlled weeds better than nicosulfuron.
Broadleaf Weed Control in Corn (Zea mays L.) with Sulfonylurea Herbicides Tank‐mixed with 2,4‐D + MCPA · 2018 · compared with nicosulfuron
No difference from an alternativeCites this paper
positive
2,4-D alone then dicamba controlled annual broadleaf weeds similarly to 2,4-D plus residual herbicides.
Mechanical versus herbicidal strategies for killing a hairy vetch cover crop and controlling weeds in minimum-tillage corn production · 2003 · compared with 2,4-D plus residual herbicides
No difference from an alternative
positive
Atrazine followed by 2,4-D kept weed density and dry weight below the economic threshold in rainfed maize.
Impact of herbicides on weeds and soil ecosystem of rainfed maize (Zea mays L.) · 2005
No difference from an alternative
positive
The 2,4-D amine plus dicamba treatment provided supplemental annual weed control.
Herbicides for No-tillage Corn in Alfalfa Sod · 1976
No difference from an alternative
positive
Postharvest glyphosate plus 2,4-D followed by spring alachlor plus atrazine at half or full rates controlled all broadleaf weeds except giant ragweed at least 88%
The Influence of Weed Management in Wheat (Triticum aestivum) Stubble on Weed Control in Corn (Zea mays) · 1998
No difference from an alternative
positive
Listed herbicide sequences and pendimethalin significantly reduced total weed dry weight.
Management of hardy weeds in maize under mid-hill conditions of Himachal Pradesh · 2012
No difference from an alternative
positive
Fall and 45-day pre-plant applications of 2,4-D and simazine controlled at least 90% of winter annual weeds through one week after corn planting.
Influence of Fall and Early Spring Herbicide Applications on Winter and Summer Annual Weed Populations in No-Till Corn · 2008
No difference from an alternative
positive
The 15 kg/ha Sesbania practice improved weed control.
Brown manuring optimization in maize: impacts on weeds, crop productivity and profitability · 2019
No difference from an alternative

27 papers more in this group

See all 36 papers →

glyphosate · weed · Zea mays (maize)Positive and negative results

41 papers: 33 positive, 8 negative or no effect

7 papers in the same direction as this claim · 33 reporting no difference from an alternative

positive
Combinations of mesotrione plus acetochlor with glyphosate or paraquat gave 93% or greater control of all three weed species.
Strategies for Control of Horseweed (Conyza canadensis) and Other Winter Annual Weeds in No-Till Corn · 2009
No difference from an alternativeCites this paper
negative
Glyphosate alone reduced weed control in crimson clover.
Control of Legume Cover Crops in No-Till Corn (Zea mays) and Cotton (Gossypium hirsutum) · 1990
Same directionCites this paper
positive
Two glyphosate applications improved weed control over one application, especially for weeds no taller than 10 cm in early-planted corn.
Effect of Planting Date, Residual Herbicide, and Postemergence Application Timing on Weed Control and Grain Yield in Glyphosate-Tolerant Corn (Zea mays)¹ · 2002 · compared with a single application
No difference from an alternative
positive
Sequential glyphosate applications reduced weed biomass in corn each year compared with a single glyphosate application at the 5-cm weed height.
Effect of Glyphosate Application Timing and Row Spacing on Weed Growth in Corn (Zea mays) and Soybean (Glycine max)¹ · 2004 · compared with a single glyphosate application at the 5-cm weed height
No difference from an alternative
positive
A single glyphosate application delayed until weeds were 15 cm or taller gave the most effective and consistent season-long annual grass and broadleaf weed control in corn.
Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study¹ · 2003
No difference from an alternative
positive
Higher glyphosate rates often improved weed control.
Influence of Herbicide Application Rate, Timing, and Interrow Cultivation on Weed Control and Corn (Zea mays) Yield in Glufosinate-Resistant and Glyphosate-Resistant Corn · 1999
No difference from an alternative
positive
Glyphosate preseeding treatment effectively suppressed perennial weeds.
The Need for Integrated Weed Management Systems in Smallholder Conservation Farming in Zimbabwe · 1995
No difference from an alternative
positive
Glyphosate control lowered midseason weed ground cover.
Conventional vs. Glyphosate-Resistant Cropping Systems in Ontario: Weed Control, Diversity, and Yield · 2009
No difference from an alternative

32 papers more in this group

See all 41 papers →

Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.

Other papers on the same question

2,4-D · weed · Zea mays (maize)Positive and negative results

glyphosate · weed · Zea mays (maize)Positive and negative results