Abstract
The search for replacements for synthetic fungicides has prompted the examination of a range of plant-based composts and extracts as alternative crop-protection agents. A study was established to compare the relative efficacy of the commercially available Jolly Farmer (JF) compost tea, of an Acadian SeaPlants Inc. (ASL) powdered-kelp product, and of Manzate® 75 DF (dry flowable) as foliar protectants against the potato late blight pathogen Phytophthora infestans. Population density, community structure, and antibiosis ability of phylloplane bacteria present on potato foliage ('Russet Burbank') were compared before and after foliar treatment. Bacteria recovered using culture-dependent means were characterized by fatty acid methyl ester (FAME) analysis and partial sequencing of their 16S ribosomal RNA genes. Autochthonous bacterial-population densities on the phylloplane varied with year, and tended to be lowest following Manzate 75 DF treatments. Phyllobacteria communities recovered from posttreatment phylloplanes often bore little resemblance to their tank-mixture counterparts, for all three treatments, and were significantly (P=0.05) less effective at inhibiting P. infestans growth, in vitro, compared with foliar communities before the treatments. Manzate 75 DF was the most effective treatment (P=0.05) for controlling P. infestans infection and disease development in vivo. Both JF compost tea and ASL powdered kelp were similar in their inability to protect potato leaves from P. infestans severity. Phyllobacterial populations established following Manzate 75 DF treatment proved to have significantly (P=0.01) fewer antibiotic-producing strains (in vitro) than naturally occurring leaf populations prior to foliar treatment. Accordingly, it appears that Manzate 75 DF derives little if any additive or synergistic plant-protectant properties from the naturally established phylloflora.
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Claims 9
Claim · model-written summary
Population densities of autochthonous phylloplane bacteria varied with year.
- Taxon
- potato
Solanum tuberosumt0 - Outcome
- bacterial-population densitiese0
- Qualifier
- varied with yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“the potato phylloplane”
e0“Autochthonous bacterial-population densities on the phylloplane varied with year”
Claim · model-written summary
Phylloplane bacterial population densities tended to be lowest following Manzate 75 DF treatments.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Manzate 75 DF treatmentse0
- Outcome
- bacterial-population densitiese0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“the potato phylloplane”
e0“Autochthonous bacterial-population densities on the phylloplane varied with year, and tended to be lowest following Manzate 75 DF treatments”
Claim · model-written summary
Bacterial communities recovered from posttreatment phylloplanes often bore little resemblance to their tank-mixture counterparts for all three treatments.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- Phyllobacteria communitiese0
- Qualifier
- little resemblance to their tank-mixture counterpartse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“the potato phylloplane”
e0“Phyllobacteria communities recovered from posttreatment phylloplanes often bore little resemblance to their tank-mixture counterparts”
Claim · model-written summary
Posttreatment phylloplane bacterial communities were significantly less effective at inhibiting P. infestans growth in vitro than communities before treatment.
- Taxon
- potatoSolanum tuberosumt0
- Interactor
- P. infestans
Phytophthora infestanse0pathogen - Outcome
- inhibiting P. infestans growthe0
- Direction
- less effectivee0
- Comparator
- foliar communities before the treatmentse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“the potato phylloplane”
e0“were significantly (P=0.05) less effective at inhibiting P. infestans growth, in vitro, compared with foliar communities before the treatments”
Claim · model-written summary
Manzate 75 DF was the most effective treatment for controlling P. infestans infection and disease development in vivo.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Manzate 75 DFe0
- Interactor
- P. infestansPhytophthora infestanse0pathogen
- Outcome
- P. infestans infection and disease developmente0
- Direction
- most effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“the potato phylloplane”
e0“Manzate 75 DF was the most effective treatment (P=0.05) for controlling P. infestans infection and disease development in vivo”
Claim · model-written summary
JF compost tea was unable to protect potato leaves from P. infestans severity.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- JF compost teae0
- Interactor
- P. infestansPhytophthora infestanse0pathogen
- Outcome
- P. infestans severitye0
- Direction
- inability to protecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“the potato phylloplane”
e0“Both JF compost tea and ASL powdered kelp were similar in their inability to protect potato leaves from P. infestans severity”
Claim · model-written summary
ASL powdered kelp was unable to protect potato leaves from P. infestans severity.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- ASL powdered kelpe0
- Interactor
- P. infestansPhytophthora infestanse0pathogen
- Outcome
- P. infestans severitye0
- Direction
- inability to protecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“the potato phylloplane”
e0“Both JF compost tea and ASL powdered kelp were similar in their inability to protect potato leaves from P. infestans severity”
Claim · model-written summary
Phylloplane bacteria established after Manzate 75 DF treatment had significantly fewer antibiotic-producing strains in vitro than leaf populations before treatment.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Manzate 75 DF treatmente0
- Outcome
- antibiotic-producing strainse0
- Direction
- fewere0
- Comparator
- naturally occurring leaf populations prior to foliar treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“the potato phylloplane”
e0“Phyllobacterial populations established following Manzate 75 DF treatment proved to have significantly (P=0.01) fewer antibiotic-producing strains (in vitro) than naturally occurring leaf populations prior to foliar treatment”
Claim · model-written summary
The authors conclude that Manzate 75 DF gains little if any additive or synergistic plant-protectant properties from the natural phylloflora.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Manzate 75 DFe0
- Outcome
- plant-protectant propertiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“the potato phylloplane”
e0“Manzate 75 DF derives little if any additive or synergistic plant-protectant properties from the naturally established phylloflora”
The same questions in other papers
fertilization · Phytophthora infestans · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
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.