Abstract
Acibenzolar-S-methyl (ASM), a plant activator known to induce systemic acquired resistance, has demonstrated an ability to manage a number of plant diseases, including bacterial spot on tomato caused by four distinct Xanthomonas spp. The aim of this study was to evaluate application rate and frequency of ASM in order to optimize field efficacy against bacterial spot in Florida, while minimizing its impact on marketable yields. ASM was applied biweekly (once every 2 weeks) as a foliar spray at a constant concentration of 12.9, 64.5, and 129 μM throughout four field experiments during 2007-08. A standard copper program and an untreated control were also included. Overall, biweekly applications of ASM did not significantly reduce disease development or the final disease severity of bacterial spot compared with the copper-mancozeb standard or the untreated control. Only one experiment showed a significant reduction in the final disease severity on plants treated with ASM at 129 μM compared with the untreated control. Three additional field trials conducted during 2009-10 to evaluate the effects of weekly and biweekly applications of ASM at concentrations of 30.3 to 200 μM found that weekly applications provided significantly better disease control than biweekly applications. The tomato yields were not statistically improved with the use of ASM relative to the untreated control and standard copper program. Weekly ASM applications at rates as low as 75 μM (equivalent to 1.58 g a.i./ha in 100 liters of water or 0.21 oz. a.i./acre in 100 gallons of water) to 200 μM (equivalent to 4.20 g a.i./ha in 100 liters of water or 0.56 oz. a.i./acre in 100 gallons of water) were statistically equivalent in managing bacterial spot of tomato without significantly reducing yield compared with the untreated control.
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Claims 6
Claim · model-written summary
Biweekly ASM did not significantly reduce bacterial spot development or final severity versus copper-mancozeb or untreated control.
- Taxon
- Tomato
Solanum lycopersicumt0 - Treatment
- biweekly applications of ASMe0
- Interactor
- Xanthomonas spp.
_-_Howard_F._Schwartz%2C_Colorado_State_University.jpg?width=60)
Xanthomonase1pathogent0 - Outcome
- disease development or the final disease severity of bacterial spote0
- Direction
- did not significantly reducee0
- Comparator
- copper-mancozeb standard or the untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_Howard_F._Schwartz%2C_Colorado_State_University.jpg?width=500)
Verbatim
e0“biweekly applications of ASM did not significantly reduce disease development or the final disease severity of bacterial spot compared with the copper-mancozeb standard or the untreated control.”
t0“Tomato”
e1“bacterial spot on tomato caused by four distinct Xanthomonas spp.”
Claim · model-written summary
In one experiment, ASM at 129 μM significantly reduced final disease severity versus untreated control.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- ASM at 129 μMe0
- Interactor
- Xanthomonas spp.Xanthomonase1pathogent0
- Outcome
- final disease severitye0
- Direction
- reductione0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only one experiment showed a significant reduction in the final disease severity on plants treated with ASM at 129 μM compared with the untreated control.”
t0“Tomato”
e1“bacterial spot on tomato caused by four distinct Xanthomonas spp.”
Claim · model-written summary
Weekly ASM provided significantly better bacterial spot control than biweekly application.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- weekly applicationse0
- Interactor
- Xanthomonas spp.Xanthomonase1pathogent0
- Outcome
- disease controle0
- Direction
- bettere0
- Comparator
- biweekly applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weekly applications provided significantly better disease control than biweekly applications.”
t0“Tomato”
e1“bacterial spot on tomato caused by four distinct Xanthomonas spp.”
Claim · model-written summary
ASM did not statistically improve tomato yields versus untreated control or standard copper.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- ASMe0
- Outcome
- tomato yieldse0
- Direction
- not statistically improvede0
- Comparator
- untreated control and standard copper programe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tomato yields were not statistically improved with the use of ASM relative to the untreated control and standard copper program.”
t0“Tomato”
Claim · model-written summary
Weekly ASM at 75 to 200 μM gave statistically equivalent bacterial spot management.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- Weekly ASM applications at rates as low as 75 μMe0
- Interactor
- Xanthomonas spp.Xanthomonase1pathogent0
- Outcome
- managing bacterial spote0
- Direction
- statistically equivalente0
- Comparator
- 200 μMe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weekly ASM applications at rates as low as 75 μM (equivalent to 1.58 g a.i./ha in 100 liters of water or 0.21 oz. a.i./acre in 100 gallons of water) to 200 μM (equivalent to 4.20 g a.i./ha in 100 liters of water or 0.56 oz. a.i./acre in 100 gallons of water) were statistically equivalent in managing bacterial spot of tomato without significantly reducing yield compared with the untreated control.”
t0“Tomato”
e1“bacterial spot on tomato caused by four distinct Xanthomonas spp.”
Claim · model-written summary
Weekly ASM at 75 to 200 μM did not significantly reduce yield versus untreated control.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- Weekly ASM applications at rates as low as 75 μMe0
- Outcome
- yielde0
- Direction
- without significantly reducinge0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weekly ASM applications at rates as low as 75 μM (equivalent to 1.58 g a.i./ha in 100 liters of water or 0.21 oz. a.i./acre in 100 gallons of water) to 200 μM (equivalent to 4.20 g a.i./ha in 100 liters of water or 0.56 oz. a.i./acre in 100 gallons of water) were statistically equivalent in managing bacterial spot of tomato without significantly reducing yield compared with the untreated control.”
t0“Tomato”
The same questions in other papers
acibenzolar-S-methyl · yield · Solanum lycopersicum (tomato)Results differ
3 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- no effect
6 papers more in this group
See all 10 papers →acibenzolar-S-methyl · Xanthomonas · Solanum lycopersicum (tomato)Results agree
1 paper in the same direction as this paper
- positive
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.