Abstract
Since 2015, Pseudomonas syringae pv. tabaci tox − has become the most significant foliar disease in the dark tobacco growing regions of Kentucky and Tennessee. Streptomycin sulfate, the main control mechanism that growers utilize to combat this bacterial disease, has evidence of resistance at 200 ppm. Field trials were established to evaluate the efficacy of copper-based products for control of angular leaf spot compared with streptomycin sulfate. Field trials were conducted from 2020 to 2022 at the West Farm of Murray State University in Murray, KY, to evaluate the efficacy of streptomycin sulfate, cuprous oxide, copper sulfate pentahydrate, and copper octanoate. In all years, the moderately susceptible dark tobacco variety KT D8LC was planted and inoculated with a streptomycin-sensitive isolate of P. syringae pv. tabaci. Tobacco treated with five applications of copper octanoate had a lower area under the disease progress curve (AUDPC) than tobacco treated with streptomycin sulfate in 2020 and 2022. Data analysis showed that in one of the three years, tobacco treated with cuprous oxide had a higher yield compared with tobacco treated with streptomycin sulfate. Tobacco treated with cuprous oxide had a higher quality grade index compared with streptomycin sulfate in 2020. Although no treatment eliminated this bacterial disease, copper products, particularly cuprous oxide and copper octanoate, are suitable alternatives to streptomycin sulfate for management of angular leaf spot.
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Claims 5
Claim · model-written summary
Five copper octanoate applications lowered disease progress relative to streptomycin in 2020 and 2022.
- Taxon
- Tobacco
Nicotiana tabacume0 - Treatment
- five applications of copper octanoatee0
- Outcome
- area under the disease progress curve (AUDPC)e0
- Direction
- lowere0
- Qualifier
- 2020 and 2022e0
- Comparator
- streptomycin sulfatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tobacco treated with five applications of copper octanoate had a lower area under the disease progress curve (AUDPC) than tobacco treated with streptomycin sulfate in 2020 and 2022”
Claim · model-written summary
Cuprous oxide raised tobacco yield over streptomycin in one of three years.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- cuprous oxidee0
- Outcome
- yielde0
- Direction
- highere0
- Qualifier
- one of the three yearse0
- Comparator
- streptomycin sulfatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in one of the three years, tobacco treated with cuprous oxide had a higher yield compared with tobacco treated with streptomycin sulfate”
Claim · model-written summary
Cuprous oxide raised tobacco quality grade index versus streptomycin in 2020.
- Taxon
- TobaccoNicotiana tabacume0
- Treatment
- cuprous oxidee0
- Outcome
- quality grade indexe0
- Direction
- highere0
- Qualifier
- 2020e0
- Comparator
- streptomycin sulfatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tobacco treated with cuprous oxide had a higher quality grade index compared with streptomycin sulfate in 2020”
Claim · model-written summary
No treatment eliminated angular leaf spot.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Outcome
- no treatment eliminated this bacterial diseasee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although no treatment eliminated this bacterial disease”
t0“Nicotiana tabacum”
Claim · model-written summary
Authors recommend cuprous oxide and copper octanoate as alternatives for angular leaf spot management.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- cuprous oxide and copper octanoatee0
- Outcome
- suitable alternatives to streptomycin sulfate for management of angular leaf spote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“copper products, particularly cuprous oxide and copper octanoate, are suitable alternatives to streptomycin sulfate for management of angular leaf spot”
t0“Nicotiana tabacum”
The same questions in other papers
copper atom · disease · Nicotiana tabacum (tobacco)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
1 paper more in this group
See all 5 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.