Abstract
A study was conducted in a no-tillage (NT) jack-o-lantern pumpkin ( Cucurbita pepo ) field following winter wheat ( Triticum aestivum ) harvest to determine the effects of using registered herbicides at various timings on weed control and pumpkin yield. All application timings used in this study were important to maximize weed control over the pumpkin growing season. For an initial stale seedbed burndown treatment, paraquat provided better broadleaf weed control than glyphosate, which lead to greater pumpkin yields. The use of s -metolachlor + halosulfuron-methyl preemergence (PRE) and clethodim postemergence (POST) gave the best results for the second series of herbicide applications which related to higher pumpkin yields compared with none or only a PRE application. The last application timing (midseason POST-directed paraquat application between rows) also improved weed control and provided higher pumpkin yields compared with no treatment. Growers who use a stale seedbed burndown treatment in NT pumpkin production, before seedling emergence or transplanting, will generally use glyphosate although this study indicated that paraquat may prove to be a better choice depending on the weed species that are present at this application timing. Most weed control in NT pumpkin production is achieved by a PRE application of various tank-mixed herbicides for both grass and broadleaf weed control, with a POST grass herbicide, a POST application of halosulfuron-methyl, or both [for control of nutsedge ( Cyperus sp.), specific broadleaf weed species, or both] applied 3 to 4 weeks later, and this study indicated that the use of labeled PRE and POST herbicides are essential to optimize weed control and pumpkin yields in NT. Most pumpkin growers do not use a POST-directed application of a nonselective herbicide (such as paraquat) before vines cover the soil surface although it appears that this application may be warranted to control weeds that have emerged later in the growing season to maximize pumpkin yield, especially if POST midseason over-the-top herbicide applications are not used. This study indicated that in addition to applying the limited PRE and POST herbicides available for weed control in pumpkin, the use of other chemical weed management practices (e.g., stale seedbed herbicide treatments or POST-directed nonselective herbicide applications) can provide valuable weed control in NT production systems and should be considered by growers to maximize pumpkin yield.
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Claims 11
Claim · model-written summary
All application timings were important to maximize seasonal weed control.
Verbatim
e0“All application timings used in this study were important to maximize weed control over the pumpkin growing season.”
Claim · model-written summary
Paraquat gave better broadleaf weed control than glyphosate.
Verbatim
e0“paraquat provided better broadleaf weed control than glyphosate”
t0“pumpkin”
Claim · model-written summary
Paraquat burndown led to greater pumpkin yields than glyphosate.
Verbatim
e0“paraquat provided better broadleaf weed control than glyphosate, which lead to greater pumpkin yields”
Claim · model-written summary
Preemergence s-metolachlor plus halosulfuron-methyl followed by postemergence clethodim gave best results.
- Taxon
- pumpkint0
- Treatment
- s -metolachlor + halosulfuron-methyl preemergence (PRE) and clethodim postemergence (POST)e0
- Outcome
- best resultse0
- Direction
- beste0
Not reportedComparator
Verbatim
e0“s -metolachlor + halosulfuron-methyl preemergence (PRE) and clethodim postemergence (POST) gave the best results”
t0“pumpkin”
Claim · model-written summary
The combined PRE and POST program gave higher pumpkin yields than no application or PRE alone.
Verbatim
e0“The use of s -metolachlor + halosulfuron-methyl preemergence (PRE) and clethodim postemergence (POST) gave the best results for the second series of herbicide applications which related to higher pumpkin yields compared with none or only a PRE application”
t0“pumpkin”
Claim · model-written summary
Midseason POST-directed paraquat improved weed control against no treatment.
Verbatim
e0“midseason POST-directed paraquat application between rows) also improved weed control and provided higher pumpkin yields compared with no treatment”
Claim · model-written summary
Midseason POST-directed paraquat increased pumpkin yields against no treatment.
Verbatim
e0“midseason POST-directed paraquat application between rows) also improved weed control and provided higher pumpkin yields compared with no treatment”
Claim · model-written summary
The authors recommend paraquat as a possible better burndown choice depending on weed species.
Verbatim
e0“paraquat may prove to be a better choice depending on the weed species that are present at this application timing”
t0“pumpkin”
Claim · model-written summary
The authors consider labeled PRE and POST herbicides essential to optimize weed control and pumpkin yield.
Verbatim
e0“use of labeled PRE and POST herbicides are essential to optimize weed control and pumpkin yields in NT”
Claim · model-written summary
The authors consider POST-directed nonselective herbicide potentially warranted against later emerging weeds.
Verbatim
e0“application may be warranted to control weeds that have emerged later in the growing season to maximize pumpkin yield”
Claim · model-written summary
Other chemical weed management practices should be considered to maximize pumpkin yield.
Verbatim
e0“other chemical weed management practices (e.g., stale seedbed herbicide treatments or POST-directed nonselective herbicide applications) can provide valuable weed control in NT production systems and should be considered by growers to maximize pumpkin yield”
The same questions in other papers
Halosulfuron-methyl · yield · Cucurbita (pumpkins)Results differ
2 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- negative
4 papers more in this group
See all 8 papers →paraquat · weed · Cucurbita (pumpkins)Results agree
1 paper in the same direction as this paper
- positive
paraquat · yield · Cucurbita (pumpkins)Results agree
1 paper in the same direction as this paper
- positive
metolachlor · yield · Cucurbita (pumpkins)Results agree
1 paper in the same direction as this paper
- positive
herbicide · yield · Cucurbita (pumpkins)Positive and negative results
3 papers in the same direction as this paper · 8 in the opposite direction
- negative
- negative
- negative
8 papers more in this group
See all 12 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.