Abstract
Tubers from plants treated with in-furrow and foliar applications of mefenoxam were inoculated with eight isolates of Phytophthora erythroseptica having varying levels of sensitivity to the fungicide. Two isolates with effective concentration causing 50% reduction of mycelial growth (EC 50 ) values of 0.02 and 0.04 μg ml -1 were categorized as being mefenoxam sensitive. Isolates with EC 50 values >1.0 μg ml -1 were designated as insensitive to mefenoxam and were grouped two each into low intermediate (EC 50 = 1.1 and 5.3 μg ml -1 ), high intermediate (EC 50 = 26 and 74 μg ml -1 ), and resistant (EC 50 ≥ 100 μg ml -1 ). The biological significance of these isolates was examined by quantifying disease control. P. erythroseptica isolates classified in the resistant group infected a significantly greater proportion of untreated tubers than isolates in any other group. Mefenoxam reduced infection frequency of sensitive isolates by as much as 37%. Mefenoxam did not provide disease control of any isolate possessing insensitivity to the fungicide, with the greatest decrease in control observed with the low intermediate group. Aggressiveness indices, representing tuber infection frequency and depth of penetration, were calculated for untreated and mefenoxam-treated tubers. According to these indices, both isolates classified in the resistant group and high intermediate isolate 252–4 were more aggressive than sensitive isolates in the absence of mefenoxam pressure, and significantly so in the presence of mefenoxam. These results suggest that pink rot may become more severe in fields known to contain P. erythroseptica populations with mefenoxam EC 50 values >1.0 μg ml -1 if the fungicide is applied. These factors should be considered when developing strategies to manage pink rot and mefenoxam-resistant populations of P. erythroseptica.
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Claims 9
Claim · model-written summary
Two isolates were mefenoxam sensitive at EC50 values 0.02 and 0.04 μg ml -1.
- Taxon
- Potato
Solanum tuberosumt0 - Interactor
- Phytophthora erythroseptica
_with_Phytophthora_erythroseptica_zoospores_fmicb-10-00131-g003.jpg?width=60)
Phytophthora erythrosepticat0pathogen - Outcome
- mycelial growth (EC 50 )e0
- Value
- 0.02 and 0.04 μg ml -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_with_Phytophthora_erythroseptica_zoospores_fmicb-10-00131-g003.jpg?width=500)
Verbatim
e0“Two isolates with effective concentration causing 50% reduction of mycelial growth (EC 50 ) values of 0.02 and 0.04 μg ml -1 were categorized as being mefenoxam sensitive.”
t0“Phytophthora erythroseptica and Its Implications for the Management of Pink Rot of Potato”
Claim · model-written summary
Resistant P. erythroseptica isolates infected more untreated tubers than other groups.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- resistant groupe0
- Interactor
- P. erythrosepticaPhytophthora erythrosepticae0pathogen
- Outcome
- proportion of untreated tuberse0
- Direction
- greatere0
- Comparator
- isolates in any other groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. erythroseptica isolates classified in the resistant group infected a significantly greater proportion of untreated tubers than isolates in any other group.”
t0“Potato”
Claim · model-written summary
Mefenoxam reduced tuber infection by sensitive isolates by up to 37%.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- Mefenoxame0
- Interactor
- Phytophthora erythrosepticaPhytophthora erythrosepticat0pathogen
- Outcome
- infection frequency of sensitive isolatese0
- Direction
- reducede0
- Value
- 37%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mefenoxam reduced infection frequency of sensitive isolates by as much as 37%.”
t0“Phytophthora erythroseptica and Its Implications for the Management of Pink Rot of Potato”
Claim · model-written summary
Mefenoxam did not control isolates insensitive to the fungicide.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- Mefenoxame0
- Interactor
- Phytophthora erythrosepticaPhytophthora erythrosepticat0pathogen
- Outcome
- disease control of any isolate possessing insensitivitye0
- Direction
- did not providee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mefenoxam did not provide disease control of any isolate possessing insensitivity to the fungicide, with the greatest decrease in control observed with the low intermediate group.”
t0“Phytophthora erythroseptica and Its Implications for the Management of Pink Rot of Potato”
Claim · model-written summary
The low intermediate group had the greatest decrease in mefenoxam control.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- low intermediate groupe0
- Interactor
- Phytophthora erythrosepticaPhytophthora erythrosepticat0pathogen
- Outcome
- controle0
- Direction
- greatest decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the greatest decrease in control observed with the low intermediate group”
t0“Phytophthora erythroseptica and Its Implications for the Management of Pink Rot of Potato”
Claim · model-written summary
Resistant isolates were more aggressive than sensitive isolates without mefenoxam.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- resistant groupe0
- Interactor
- Phytophthora erythrosepticaPhytophthora erythrosepticat0pathogen
- Outcome
- more aggressivee0
- Direction
- more aggressivee0
- Comparator
- sensitive isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both isolates classified in the resistant group and high intermediate isolate 252–4 were more aggressive than sensitive isolates in the absence of mefenoxam pressure”
t0“Phytophthora erythroseptica and Its Implications for the Management of Pink Rot of Potato”
Claim · model-written summary
High intermediate isolate 252–4 was more aggressive than sensitive isolates without mefenoxam.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- high intermediate isolate 252–4e0
- Interactor
- Phytophthora erythrosepticaPhytophthora erythrosepticat0pathogen
- Outcome
- more aggressivee0
- Direction
- more aggressivee0
- Comparator
- sensitive isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both isolates classified in the resistant group and high intermediate isolate 252–4 were more aggressive than sensitive isolates in the absence of mefenoxam pressure”
t0“Phytophthora erythroseptica and Its Implications for the Management of Pink Rot of Potato”
Claim · model-written summary
Resistant and high intermediate isolates were significantly more aggressive than sensitive isolates under mefenoxam.
- Taxon
- PotatoSolanum tuberosumt0
- Interactor
- Phytophthora erythrosepticaPhytophthora erythrosepticat0pathogen
- Outcome
- aggressivee1
- Direction
- more aggressivee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significantly so in the presence of mefenoxam”
t0“Phytophthora erythroseptica and Its Implications for the Management of Pink Rot of Potato”
e1“both isolates classified in the resistant group and high intermediate isolate 252–4 were more aggressive than sensitive isolates in the absence of mefenoxam pressure”
Claim · model-written summary
Authors suggest pink rot may worsen when mefenoxam is used in fields with pathogen populations above EC50 1.0 μg ml -1.
- Taxon
- PotatoSolanum tuberosumt0
- Interactor
- P. erythrosepticaPhytophthora erythrosepticae0pathogen
- Outcome
- pink rot may become more severee0
- Qualifier
- mefenoxam EC 50 values >1.0 μg ml -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pink rot may become more severe in fields known to contain P. erythroseptica populations with mefenoxam EC 50 values >1.0 μg ml -1 if the fungicide is applied.”
t0“Potato”
The same questions in other papers
metalaxyl-M · Phytophthora erythroseptica · Solanum tuberosum (potato)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.