Abstract
Bell pepper is an economically important vegetable crop that is often impaired by weeds. Management of weeds in bell pepper is required to minimize yield loss because this crop does not tolerate weed competition. Several herbicides have been reported as selective for bell pepper, but research supporting their use for weed control in this crop is limited. Several herbicides were screened in a greenhouse to assess effects on plant biomass, and eight were selected that appeared to be safe for bell pepper. These herbicides, in addition to oxadiargyl, were then evaluated at two different Chilean locations, using different application timings. We measured the effects on plant injury, fruit yield, and the need for additional hand weeding on transplanted bell peppers. The herbicides clomazone, napropamide, pendimethalin, and S -metolachlor caused minimal foliar chlorosis and necrosis but did not affect fruit yield at either location. Pretransplant-incorporated application (PTI) caused no effect on fruit yield from the herbicides evaluated, whereas applications 2 wk (POST2) and 8 wk (POST8) after transplanting reduced fruit yield significantly. For weed management, the best combination was PTI + POST2 + POST8, which reduced the hand-weeding time by 30% compared to the control, at both locations. Based on our results, clomazone, pendimethalin, and S -metolachlor were the most effective treatments applied after transplanting, whereas all herbicides tested were selective for bell pepper when applied and incorporated before transplanting. Results presented here provide new insight into herbicides that can be used to manage weeds in bell pepper and shows that timing of herbicide application is critical to prevent injury to this crop.
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Claims 11
Claim · model-written summary
Eight greenhouse-screened herbicides appeared safe for bell pepper biomass.
Not reportedDirection
Verbatim
e0“eight were selected that appeared to be safe for bell pepper”
Claim · model-written summary
Four herbicides caused minimal foliar injury.
- Taxon
- Bell peppert0
- Treatment
- clomazone, napropamide, pendimethalin, and S -metolachlore0
- Outcome
- foliar chlorosis and necrosise0
- Direction
- minimale0
Not reportedComparator
Verbatim
e0“The herbicides clomazone, napropamide, pendimethalin, and S -metolachlor caused minimal foliar chlorosis and necrosis”
t0“Bell Pepper”
Claim · model-written summary
Those four herbicides did not affect fruit yield at either location.
- Taxon
- Bell peppert0
- Treatment
- clomazone, napropamide, pendimethalin, and S -metolachlore0
- Outcome
- fruit yielde0
- Direction
- did not affecte0
- Qualifier
- either locatione0
Not reportedComparator
Verbatim
e0“The herbicides clomazone, napropamide, pendimethalin, and S -metolachlor caused minimal foliar chlorosis and necrosis but did not affect fruit yield at either location”
t0“Bell Pepper”
Claim · model-written summary
Pretransplant incorporated herbicides did not affect fruit yield.
- Taxon
- Bell peppert0
- Treatment
- Pretransplant-incorporated application (PTI)e0
- Outcome
- fruit yielde0
- Direction
- no effecte0
Not reportedComparator
Verbatim
e0“Pretransplant-incorporated application (PTI) caused no effect on fruit yield from the herbicides evaluated”
t0“Bell Pepper”
Claim · model-written summary
Application two weeks after transplanting significantly reduced fruit yield.
Not reportedComparator
Verbatim
e0“applications 2 wk (POST2) and 8 wk (POST8) after transplanting reduced fruit yield significantly”
t0“Bell Pepper”
Claim · model-written summary
Application eight weeks after transplanting significantly reduced fruit yield.
Not reportedComparator
Verbatim
e0“applications 2 wk (POST2) and 8 wk (POST8) after transplanting reduced fruit yield significantly”
t0“Bell Pepper”
Claim · model-written summary
PTI plus POST2 plus POST8 cut hand-weeding time by 30% relative to control at both sites.
Verbatim
e0“PTI + POST2 + POST8, which reduced the hand-weeding time by 30% compared to the control, at both locations”
t0“Bell Pepper”
Claim · model-written summary
Clomazone was among the most effective posttransplant treatments.
Verbatim
e0“clomazone, pendimethalin, and S -metolachlor were the most effective treatments applied after transplanting”
t0“Bell Pepper”
Claim · model-written summary
Pendimethalin was among the most effective posttransplant treatments.
Verbatim
e0“clomazone, pendimethalin, and S -metolachlor were the most effective treatments applied after transplanting”
t0“Bell Pepper”
Claim · model-written summary
S -metolachlor was among the most effective posttransplant treatments.
Verbatim
e0“clomazone, pendimethalin, and S -metolachlor were the most effective treatments applied after transplanting”
t0“Bell Pepper”
Claim · model-written summary
All tested pretransplant incorporated herbicides were selective for bell pepper.
- Taxon
- bell peppere0
- Outcome
- selective for bell peppere0
- Qualifier
- when applied and incorporated before transplantinge0
Not reportedDirection
Verbatim
e0“all herbicides tested were selective for bell pepper when applied and incorporated before transplanting”
The same questions in other papers
pendimethalin · yield · Capsicum annuum (sweet pepper)Positive and negative results
1 in the opposite direction
- positive
clomazone · physiology: pigments · Capsicum annuum (sweet pepper)Positive and negative results
1 in the opposite direction
- negative
napropamide · yield · Capsicum annuum (sweet pepper)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
clomazone · yield · Capsicum annuum (sweet pepper)Results agree
1 paper in the same direction as this paper
- no effect
metolachlor · yield · Capsicum annuum (sweet pepper)Results agree
1 paper in the same direction as this paper
- no effect
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.