Abstract
Abstract Branched broomrape management is of increasing concern to California processing tomato growers. Field research was conducted in 2023 and 2024 to evaluate various application timings of chemigated rimsulfuron alone, preplant-incorporated (PPI) sulfosulfuron paired with chemigated rimsulfuron, and foliar maleic hydrazide alone and paired with PPI sulfosulfuron and chemigated rimsulfuron. In 2023, all treatments with 70 g ai ha −1 rimsulfuron, alone or paired with PPI sulfosulfuron, reduced broomrape emergence 77% to 92% compared to the nontreated control. In 2024, broomrape pressure was higher, and all rimsulfuron treatments reduced broomrape emergence 68% to 86% compared to the control. In both years, five applications of foliar maleic hydrazide reduced broomrape emergence through at least mid-season. The 2024 experiment included a combination treatment of PPI sulfosulfuron, chemigated rimsulfuron, and foliar maleic hydrazide, which resulted in <4 broomrape clusters plot −1 . In a 2024 grower-scale demonstration trial, two application regimes totaling 70 g ai ha −1 of chemigated rimsulfuron reduced broomrape emergence 83% to 89% compared to the control. Overall, chemigated rimsulfuron applied at various timings and rates totaling 70 g ai ha −1 reduced broomrape emergence by two-thirds or more compared to the nontreated plots. No crop injury was observed in trials with rimsulfuron, sulfosulfuron, or maleic hydrazide treatments in small-plot trials or with rimsulfuron in the grower-scale demonstration trial. Under a recently approved 24(c) Special Local Need label, California growers can use three applications of rimsulfuron applied via chemigation to suppress broomrape in known infested fields or to reduce the risk of broomrape establishment in fields of concern for this quarantine pest. Promising results from sulfosulfuron and maleic hydrazide suggest that registering additional herbicides could help develop even more robust branched broomrape management programs.
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Claims 8
Claim · model-written summary
In 2023, rimsulfuron alone or paired with sulfosulfuron reduced branched broomrape emergence by 77% to 92% compared with the nontreated control.
Verbatim
t0“California processing tomato”
e0“In 2023, all treatments with 70 g ai ha −1 rimsulfuron, alone or paired with PPI sulfosulfuron, reduced broomrape emergence 77% to 92% compared to the nontreated control”
Claim · model-written summary
In 2024, all rimsulfuron treatments reduced branched broomrape emergence by 68% to 86% compared with the control.
Verbatim
t0“California processing tomato”
e2“In 2024, broomrape pressure was higher, and all rimsulfuron treatments reduced broomrape emergence 68% to 86% compared to the control”
Claim · model-written summary
Five applications of foliar maleic hydrazide reduced branched broomrape emergence through at least mid-season.
- Taxon
- processing tomatot0
- Treatment
- five applications of foliar maleic hydrazidee3
- Interactor
- broomrapee3parasite
- Outcome
- broomrape emergencee3
- Direction
- reducede3
- Qualifier
- through at least mid-seasone3
Not reportedComparator
Verbatim
t0“California processing tomato”
e3“In both years, five applications of foliar maleic hydrazide reduced broomrape emergence through at least mid-season”
Claim · model-written summary
The combination of PPI sulfosulfuron, chemigated rimsulfuron and foliar maleic hydrazide gave fewer than 4 broomrape clusters per plot in 2024.
- Taxon
- processing tomatot0
- Treatment
- PPI sulfosulfuron, chemigated rimsulfuron, and foliar maleic hydrazidee4
- Interactor
- broomrapee4parasite
- Outcome
- broomrape clusterse4
- Direction
- decreaseinferrede4
- Value
- <4 broomrape clusterse4
Not reportedComparator
Verbatim
t0“California processing tomato”
e4“The 2024 experiment included a combination treatment of PPI sulfosulfuron, chemigated rimsulfuron, and foliar maleic hydrazide, which resulted in <4 broomrape clusters”
Claim · model-written summary
In a 2024 grower-scale demonstration trial, two application regimes totaling 70 g ai ha −1 of chemigated rimsulfuron reduced broomrape emergence by 83% to 89% compared with the control.
Verbatim
t0“California processing tomato”
e5“In a 2024 grower-scale demonstration trial, two application regimes totaling 70 g ai ha −1 of chemigated rimsulfuron reduced broomrape emergence 83% to 89% compared to the control”
Claim · model-written summary
Chemigated rimsulfuron at various timings and rates totaling 70 g ai ha −1 reduced broomrape emergence by two-thirds or more compared with nontreated plots.
Verbatim
t0“California processing tomato”
e6“Overall, chemigated rimsulfuron applied at various timings and rates totaling 70 g ai ha −1 reduced broomrape emergence by two-thirds or more compared to the nontreated plots”
Claim · model-written summary
No crop injury was observed in processing tomato in small-plot trials with rimsulfuron, sulfosulfuron or maleic hydrazide.
Verbatim
t0“California processing tomato”
e7“No crop injury was observed in trials with rimsulfuron, sulfosulfuron, or maleic hydrazide treatments in small-plot trials”
Claim · model-written summary
Registering additional herbicides could help develop more robust branched broomrape management programs in processing tomato.
Verbatim
t0“California processing tomato”
e1“Promising results from sulfosulfuron and maleic hydrazide suggest that registering additional herbicides could help develop even more robust branched broomrape management programs”
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