Abstract
Integrating disease control strategies has been the foundation for effective management of Phytophthora stem and root rot (PSRR; caused by Phytophthora sojae) in soybean (Glycine max [L.] Merr.). To determine the efficacy of seed treatment formulation (clothianidin + ethaboxam + ipconazole + metalaxyl) and host resistance (Rps1k or Rps1c and moderately resistant [MR] or moderately susceptible [MS]), five environments with disease history were evaluated in Nebraska during 2017 and 2018. Despite the use of resistant cultivars, PSRR developed in four out of five environments. Compared with the untreated control, seed treatment increased soybean emergence by 16,320 to 63,037 plants/ha and mid-season canopy coverage (CC) by 5.2 to 8.3%. Although management programs with MR cultivars had greater yields (538.9 to 747.5 kg/ha) than MS cultivars, there were negligible yield differences between Rps1k and Rps1c genotypes, except in one environment. A weak to moderate (ρ = –0.32 to –0.45; P ≤ 0.001) association was observed between mid-season CC and the number of plants with P. sojae stem lesions. Outcomes from this study demonstrate the usefulness of integrating CC assessments to support disease severity evaluations in field settings and reinforce the benefits of combining host resistance and seed treatment to manage soybean seedling diseases in PSRR-conducive environments.
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Claims 8
Claim · model-written summary
PSRR developed in four of five environments despite resistant cultivars.
- Taxon
- soybean
Glycine maxt0 - Outcome
- PSRR developede0
- Value
- four out of five environmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Despite the use of resistant cultivars, PSRR developed in four out of five environments.”
Claim · model-written summary
Seed treatment increased emergence by 16,320 to 63,037 plants per hectare.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- seed treatmente0
- Outcome
- soybean emergencee0
- Direction
- increasede0
- Value
- 16,320 to 63,037 plants/hae0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Compared with the untreated control, seed treatment increased soybean emergence by 16,320 to 63,037 plants/ha”
Claim · model-written summary
Seed treatment increased midseason canopy coverage by 5.2 to 8.3%.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- seed treatmente0
- Outcome
- mid-season canopy coveragee0
- Direction
- increasede0
- Value
- 5.2 to 8.3%e0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Compared with the untreated control, seed treatment increased soybean emergence by 16,320 to 63,037 plants/ha and mid-season canopy coverage (CC) by 5.2 to 8.3%.”
Claim · model-written summary
Moderately resistant cultivars yielded 538.9 to 747.5 kg/ha more than moderately susceptible cultivars.
- Taxon
- SoybeanGlycine maxt0
- Material
- MR cultivarse0
- Outcome
- yieldse0
- Direction
- greatere0
- Value
- 538.9 to 747.5 kg/hae0
- Comparator
- MS cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“management programs with MR cultivars had greater yields (538.9 to 747.5 kg/ha) than MS cultivars”
Claim · model-written summary
Rps1k and Rps1c genotypes showed negligible yield differences except in one environment.
- Taxon
- SoybeanGlycine maxt0
- Material
- Rps1ke0
- Outcome
- yield differencese0
- Direction
- negligiblee0
- Qualifier
- except in one environmente0
- Comparator
- Rps1c genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“there were negligible yield differences between Rps1k and Rps1c genotypes, except in one environment.”
Claim · model-written summary
Canopy coverage was negatively associated with plants bearing P. sojae stem lesions.
- Taxon
- SoybeanGlycine maxt0
- Interactor
- P. sojaePhytophthora sojaee0pathogen
- Outcome
- number of plants with P. sojae stem lesionse0
- Value
- ρ = –0.32 to –0.45e0
- Comparator
- mid-season CCe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“A weak to moderate (ρ = –0.32 to –0.45; P ≤ 0.001) association was observed between mid-season CC and the number of plants with P. sojae stem lesions.”
Claim · model-written summary
The authors recommend canopy coverage assessment to support field disease severity evaluation.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- integrating CC assessments to support disease severity evaluationse0
- Setting
- field settingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“integrating CC assessments to support disease severity evaluations in field settings”
Claim · model-written summary
The authors support combining host resistance and seed treatment to manage soybean seedling disease.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- combining host resistance and seed treatment to manage soybean seedling diseasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“combining host resistance and seed treatment to manage soybean seedling diseases in PSRR-conducive environments”
The same questions in other papers
seed treatment · growth · Glycine max (soybean)Positive and negative results
134 papers in the same direction as this paper · 30 in the opposite direction
- positive
- no effect
- negative
161 papers more in this group
See all 165 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.