Abstract
Possibilities of biological control of brown rot disease caused by Ralstonia solanacearum were investigated in a greenhouse and in a naturally infested commercial potato field. Three biocontrol agents (BCAs) namely Bacillus subtilis, Trichoderma album and Trichoderma hamatum, isolated from commercial potato field and identified in the Department of Plant Pathology, National Research Centre in Egypt. In the greenhouse experiment, B. subtilis as seed tuber treatment significantly reduced the bacterial wilt disease incidence in potato cvs. Diamante and Spounta, followed by T. hamatum and T. album compared with the controls. Three field experiments were carried out as follows: (i) the first experiment during the winter of 2006/2007 seasons, (ii) the second during the summer of the 2007 season, and (iii) the third during the winter of 2007/2008 seasons. The BCA treatments improved the vegetative growth parameters such as plant height, stem number/pit and leaf number/plant compared with the control plants. The treatments also enhanced the average tuber weight and tuber yield/plant. Field application of the BCAs as tuber and/or soil treatments significantly reduced the brown rot incidence and bacterial wilt severity. In the first experiment, the BCA treatments reduced the brown rot incidence in potato cv. Diamante from 15.3 to 21.3% compared with 21.9% in the untreated plants. In the second experiment, the percentage of bacterial wilt severity (BWS) in treated potato cv. Nicola was in the range 18.0–22.0% 60 days after planting compared with 38.0% in the control plants. The percentage disease control was in the range 42.1–52.6%. The brown rot incidence (BRI) was in the range 21.2–46.3% as tuber treatment and 18.9–29.1% as soil treatment in treated potato plants compared with a disease incidence of 60% in the control plants. In the third experiment, the BWS was less than 8% in treated potato cv. Diamante, compared with 16% in control plants 60 days after planting. T. hamatum completely protected the potato tubers against brown rot, than T. album and B. subtilis as well as the control. The BCA as soil treatments were more effective than tuber treatments for decreasing the BRI in potato and enhancing the growth and tuber yield parameters. This study revealed that B. subtilis, T. hamatum and T. album are promising as BCAs which are effective under field conditions for controlling potato brown rot.
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Claims 17
Claim · model-written summary
B. subtilis seed tuber treatment significantly reduced bacterial wilt incidence in Diamante and Spounta.
- Taxon
- potato
Solanum tuberosume0 - Material
- Diamante and Spountae0
- Treatment
- B. subtilis as seed tuber treatmente0
- Interactor
- B. subtilis
Bacillus subtilise0biocontrol_agent - Outcome
- bacterial wilt disease incidencee0
- Direction
- reducede0
- Comparator
- the controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“B. subtilis as seed tuber treatment significantly reduced the bacterial wilt disease incidence in potato cvs. Diamante and Spounta, followed by T. hamatum and T. album compared with the controls”
Claim · model-written summary
T. hamatum reduced bacterial wilt incidence after B. subtilis.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- T. hamatume0
- Interactor
- T. hamatum
Trichoderma hamatume0biocontrol_agent - Outcome
- bacterial wilt disease incidencee0
- Direction
- reducede0
- Comparator
- the controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“B. subtilis as seed tuber treatment significantly reduced the bacterial wilt disease incidence in potato cvs. Diamante and Spounta, followed by T. hamatum and T. album compared with the controls”
Claim · model-written summary
T. album reduced bacterial wilt incidence after B. subtilis.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- T. albume0
- Interactor
- T. albumTrichoderma albume0biocontrol_agent
- Outcome
- bacterial wilt disease incidencee0
- Direction
- reducede0
- Comparator
- the controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“B. subtilis as seed tuber treatment significantly reduced the bacterial wilt disease incidence in potato cvs. Diamante and Spounta, followed by T. hamatum and T. album compared with the controls”
Claim · model-written summary
Biocontrol treatments improved potato height, stem number and leaf number.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- BCA treatmentse0
- Outcome
- plant height, stem number/pit and leaf number/plante0
- Direction
- improvede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The BCA treatments improved the vegetative growth parameters such as plant height, stem number/pit and leaf number/plant compared with the control plants”
e1“naturally infested commercial potato field”
Claim · model-written summary
Biocontrol treatments enhanced average tuber weight and tuber yield per plant.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- The treatmentse0
- Outcome
- average tuber weight and tuber yield/plante0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatments also enhanced the average tuber weight and tuber yield/plant”
e1“naturally infested commercial potato field”
Claim · model-written summary
Field biocontrol applications significantly reduced brown rot incidence.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- BCAs as tuber and/or soil treatmentse0
- Outcome
- brown rot incidencee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field application of the BCAs as tuber and/or soil treatments significantly reduced the brown rot incidence and bacterial wilt severity”
e1“naturally infested commercial potato field”
Claim · model-written summary
Field biocontrol applications significantly reduced bacterial wilt severity.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- BCAs as tuber and/or soil treatmentse0
- Outcome
- bacterial wilt severitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field application of the BCAs as tuber and/or soil treatments significantly reduced the brown rot incidence and bacterial wilt severity”
e1“naturally infested commercial potato field”
Claim · model-written summary
First-experiment brown rot incidence in treated Diamante was 15.3 to 21.3% versus 21.9% untreated.
- Taxon
- potatoSolanum tuberosume0
- Material
- Diamantee0
- Treatment
- BCA treatmentse0
- Outcome
- brown rot incidencee0
- Direction
- reducede0
- Value
- 15.3 to 21.3%e0
- Qualifier
- 21.9%e0
- Comparator
- untreated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the BCA treatments reduced the brown rot incidence in potato cv. Diamante from 15.3 to 21.3% compared with 21.9% in the untreated plants”
Claim · model-written summary
Treated Nicola bacterial wilt severity was 18.0–22.0% versus 38.0% controls at 60 days.
- Taxon
- potatoSolanum tuberosume0
- Material
- Nicolae0
- Treatment
- treatede0
- Outcome
- bacterial wilt severity (BWS)e0
- Value
- 18.0–22.0%e0
- Qualifier
- 38.0%e0
- Comparator
- control plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the percentage of bacterial wilt severity (BWS) in treated potato cv. Nicola was in the range 18.0–22.0% 60 days after planting compared with 38.0% in the control plants”
Claim · model-written summary
Second-experiment disease control was 42.1–52.6%.
- Taxon
- potatoSolanum tuberosume1
- Outcome
- percentage disease controle0
- Value
- 42.1–52.6%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage disease control was in the range 42.1–52.6%”
e1“treated potato cv. Nicola”
Claim · model-written summary
Tuber treatment yielded brown rot incidence of 21.2–46.3% versus 60% controls.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- tuber treatmente0
- Outcome
- brown rot incidence (BRI)e0
- Value
- 21.2–46.3%e0
- Qualifier
- 60%e0
- Comparator
- control plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The brown rot incidence (BRI) was in the range 21.2–46.3% as tuber treatment and 18.9–29.1% as soil treatment in treated potato plants compared with a disease incidence of 60% in the control plants”
Claim · model-written summary
Soil treatment yielded brown rot incidence of 18.9–29.1% versus 60% controls.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- soil treatmente0
- Outcome
- brown rot incidence (BRI)e0
- Value
- 18.9–29.1%e0
- Qualifier
- 60%e0
- Comparator
- control plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The brown rot incidence (BRI) was in the range 21.2–46.3% as tuber treatment and 18.9–29.1% as soil treatment in treated potato plants compared with a disease incidence of 60% in the control plants”
Claim · model-written summary
Treated Diamante bacterial wilt severity was below 8% versus 16% controls.
- Taxon
- potatoSolanum tuberosume0
- Material
- Diamantee0
- Treatment
- treatede0
- Outcome
- BWSe0
- Value
- less than 8%e0
- Qualifier
- 16%e0
- Comparator
- control plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the BWS was less than 8% in treated potato cv. Diamante, compared with 16% in control plants 60 days after planting”
Claim · model-written summary
T. hamatum completely protected potato tubers against brown rot.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- T. hamatume0
- Interactor
- T. hamatumTrichoderma hamatume0biocontrol_agent
- Outcome
- brown rote0
- Direction
- completely protectede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T. hamatum completely protected the potato tubers against brown rot, than T. album and B. subtilis as well as the control”
Claim · model-written summary
Soil treatments outperformed tuber treatments for reducing potato brown rot incidence.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- BCA as soil treatmentse0
- Outcome
- BRIe0
- Direction
- decreasinge0
- Comparator
- tuber treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The BCA as soil treatments were more effective than tuber treatments for decreasing the BRI in potato and enhancing the growth and tuber yield parameters”
Claim · model-written summary
Soil treatments outperformed tuber treatments for enhancing growth and tuber yield.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- BCA as soil treatmentse0
- Outcome
- growth and tuber yield parameterse0
- Direction
- enhancinge0
- Comparator
- tuber treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The BCA as soil treatments were more effective than tuber treatments for decreasing the BRI in potato and enhancing the growth and tuber yield parameters”
Claim · model-written summary
The authors identify B. subtilis, T. hamatum and T. album as promising field biocontrol agents for potato brown rot.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- B. subtilis, T. hamatum and T. albume0
- Outcome
- controlling potato brown rote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“B. subtilis, T. hamatum and T. album are promising as BCAs which are effective under field conditions for controlling potato brown rot”
The same questions in other papers
Bacillus subtilis · disease · Solanum tuberosum (potato)Positive and negative results
13 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
11 papers more in this group
See all 15 papers →biocontrol · disease · Solanum tuberosum (potato)Positive and negative results
17 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
15 papers more in this group
See all 19 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.