Abstract
Deciding on the most efficacious PRE and POST herbicide options and their ideal application timing can be challenging for soybean producers. Climatic events during the 14 d before and after herbicide application can further complicate decisions because of their influence on herbicide effectiveness. Nine field trials were conducted at three locations in southwestern Ontario from 2003 to 2006, to determine the most effective PRE and POST soybean herbicides for control of common lambsquarters, common ragweed, green foxtail, and redroot pigweed. When precipitation was low at least 7 d before and after herbicide application weed control was reduced in treatments that included imazethapyr (PRE or POST) or flumetsulam/ S -metolachlor (a premix formulation) (PRE). Cumulative precipitation during the 12 d after PRE application that exceeded the monthly average by at least 60% reduced common lambsquarters control when metribuzin was applied and green foxtail control when imazethapyr was applied. Delaying application of imazethapyr + bentazon to a later soybean growth stage decreased control of common lambsquarters and green foxtail; however, environmental conditions appeared to influence these results. Precipitation on the day of application decreased control of common ragweed and redroot pigweed more with quizalofop-p-ethyl + thifensulfuron-methyl + bentazon compared with imazethapyr + bentazon. Soybean yield varied among POST herbicide treatments because of reduced weed control. This research confirms that environmental conditions pre- and postapplication, as well as application timing, influence herbicide efficacy and should be considered by growers when selecting an herbicide program.
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Claims 10
Claim · model-written summary
Low precipitation before and after application reduced weed control with imazethapyr.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- imazethapyr (PRE or POST)e0
- Outcome
- weed controle0
- Direction
- reducede0
- Qualifier
- precipitation was low at least 7 d before and after herbicide applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When precipitation was low at least 7 d before and after herbicide application weed control was reduced in treatments that included imazethapyr (PRE or POST)”
t0“Soybean”
Claim · model-written summary
Low precipitation before and after application reduced weed control with PRE flumetsulam/S-metolachlor.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- flumetsulam/ S -metolachlor (a premix formulation) (PRE)e0
- Outcome
- weed controle0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When precipitation was low at least 7 d before and after herbicide application weed control was reduced in treatments that included imazethapyr (PRE or POST) or flumetsulam/ S -metolachlor (a premix formulation) (PRE)”
t0“Soybean”
Claim · model-written summary
Excess precipitation after PRE metribuzin application reduced common lambsquarters control.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- metribuzine0
- Interactor
- common lambsquarters
Chenopodium albume0weed - Outcome
- common lambsquarters controle0
- Direction
- reducede0
- Qualifier
- exceeded the monthly average by at least 60%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cumulative precipitation during the 12 d after PRE application that exceeded the monthly average by at least 60% reduced common lambsquarters control when metribuzin was applied”
t0“Soybean”
Claim · model-written summary
Excess precipitation after PRE imazethapyr application reduced green foxtail control.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- imazethapyre0
- Interactor
- green foxtaile0weed
- Outcome
- green foxtail controle0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cumulative precipitation during the 12 d after PRE application that exceeded the monthly average by at least 60% reduced common lambsquarters control when metribuzin was applied and green foxtail control when imazethapyr was applied”
t0“Soybean”
Claim · model-written summary
Later imazethapyr plus bentazon application decreased common lambsquarters control.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- imazethapyr + bentazone0
- Interactor
- common lambsquartersChenopodium albume0weed
- Outcome
- control of common lambsquarterse0
- Direction
- decreasede0
- Comparator
- later soybean growth stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delaying application of imazethapyr + bentazon to a later soybean growth stage decreased control of common lambsquarters and green foxtail”
t0“Soybean”
Claim · model-written summary
Later imazethapyr plus bentazon application decreased green foxtail control.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- imazethapyr + bentazone0
- Interactor
- green foxtaile0weed
- Outcome
- green foxtaile0
- Direction
- decreasede0
- Comparator
- later soybean growth stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delaying application of imazethapyr + bentazon to a later soybean growth stage decreased control of common lambsquarters and green foxtail”
t0“Soybean”
Claim · model-written summary
Precipitation on application day decreased common ragweed control more with quizalofop-p-ethyl plus thifensulfuron-methyl plus bentazon than imazethapyr plus bentazon.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- quizalofop-p-ethyl + thifensulfuron-methyl + bentazone0
- Interactor
- common ragweed
Ambrosia artemisiifoliae0weed - Outcome
- control of common ragweede0
- Direction
- decreasede0
- Comparator
- imazethapyr + bentazone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Precipitation on the day of application decreased control of common ragweed and redroot pigweed more with quizalofop-p-ethyl + thifensulfuron-methyl + bentazon compared with imazethapyr + bentazon”
t0“Soybean”
Claim · model-written summary
Precipitation on application day decreased redroot pigweed control more with quizalofop-p-ethyl plus thifensulfuron-methyl plus bentazon than imazethapyr plus bentazon.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- quizalofop-p-ethyl + thifensulfuron-methyl + bentazone0
- Interactor
- redroot pigweede0weed
- Outcome
- redroot pigweede0
- Direction
- decreasede0
- Comparator
- imazethapyr + bentazone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Precipitation on the day of application decreased control of common ragweed and redroot pigweed more with quizalofop-p-ethyl + thifensulfuron-methyl + bentazon compared with imazethapyr + bentazon”
t0“Soybean”
Claim · model-written summary
Soybean yield varied among POST herbicide treatments because weed control was reduced.
- Taxon
- SoybeanGlycine maxe0
- Treatment
- POST herbicide treatmentse0
- Outcome
- Soybean yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean yield varied among POST herbicide treatments because of reduced weed control”
Claim · model-written summary
The authors advised growers to consider conditions before and after application and application timing when choosing herbicide programs.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- should be considered by growers when selecting an herbicide programe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“environmental conditions pre- and postapplication, as well as application timing, influence herbicide efficacy and should be considered by growers when selecting an herbicide program”
t0“Soybean”
The same questions in other papers
bentazone · Chenopodium album · Glycine max (soybean)Positive and negative results
1 in the opposite direction
- positive
Imazethapyr · Chenopodium album · Glycine max (soybean)Positive and negative results
2 in the opposite direction
- positive
- positive
bentazone · organism · Glycine max (soybean)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →Imazethapyr · organism · Glycine max (soybean)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 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.