Abstract
Pink rot of potato, caused by Phytophthora erythroseptica, causes yield losses in the field and in storage. Surveys were conducted in Prince Edward Island (P.E.I.) during 19992001 to determine the sensitivity of local isolates of the pathogen to mefenoxam (Ridomil®). In addition, field trials were established to test the efficacy of foliar applications of Ridomil to control pink rot in stored progeny tubers. Of 47, 24, and 4 samples of infected tubers collected from harvested fields or warehouses across P.E.I. in 1999, 2000, and 2001, respectively, 15 (32%), 2 (8%), and 2 (50%) contained tubers showing symptoms of pink rot. Tissues excised from infected tubers of samples showing symptoms of pink rot yielded 62, 7, and 8 field isolates of P. erythroseptica in 1999, 2000, and 2001, respectively. In 1999 and 2000, 97 and 17 single-zoospore isolates were also generated, respectively, for testing of sensitivity to mefenoxam. An assay on agar amended with mefenoxam revealed that all field and single-zoospore isolates collected from P.E.I. were highly sensitive to mefenoxam (EC50 < 0.5 µg mefenoxam/mL). By contrast, tester isolates of P. erythroseptica from Maine were either sensitive, moderately resistant, or highly resistant to mefenoxam. Tubers ('Russet Burbank' and 'Kennebec') harvested from field plots managed with foliar applications of mefenoxam were inoculated with selected isolates of P. erythroseptica. Isolates that were inhibited on agar medium amended with mefenoxam were also suppressed in tubers from plants treated with foliar applications of the chemical. One foliar application of mefenoxam at tuber initiation was often sufficient to provide a significant (P = 0.05) reduction in pink rot incidence and severity. In some instances, two foliar applications (at tuber initiation and 2 weeks thereafter) reduced disease incidence and severity significantly (P = 0.05) more than a single application. By contrast, tester isolates of P. erythroseptica from Maine designated as either moderately or highly resistant following the amended-agar assay, also infected tubers from plants treated with mefenoxam. Fungicide efficacy was found to vary between cultivars and among years of study; suppression of pink rot was greater in 'Kennebec' than 'Russet Burbank', and fungicide efficacy was reduced in drier years. Management of resistance to mefenoxam and application scheduling are discussed.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Pink rot symptoms occurred in 15 samples in 1999.
- Taxon
- potato
Solanum tuberosumt0 - Interactor
- pink rote0pathogen
- Outcome
- tubers showing symptoms of pink rote0
- Value
- 15 (32%)e0
- Setting
- 1999e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 1999, 2000, and 2001, respectively, 15 (32%), 2 (8%), and 2 (50%) contained tubers showing symptoms of pink rot”
t0“potato”
Claim · model-written summary
Pink rot symptoms occurred in 2 samples in 2000.
- Taxon
- potatoSolanum tuberosumt0
- Interactor
- pink rote0pathogen
- Outcome
- tubers showing symptoms of pink rote0
- Value
- 2 (8%)e0
- Setting
- 2000e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 1999, 2000, and 2001, respectively, 15 (32%), 2 (8%), and 2 (50%) contained tubers showing symptoms of pink rot”
t0“potato”
Claim · model-written summary
Pink rot symptoms occurred in 2 samples in 2001.
- Taxon
- potatoSolanum tuberosumt0
- Interactor
- pink rote0pathogen
- Outcome
- tubers showing symptoms of pink rote0
- Value
- 2 (50%)e0
- Setting
- 2001e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 1999, 2000, and 2001, respectively, 15 (32%), 2 (8%), and 2 (50%) contained tubers showing symptoms of pink rot”
t0“potato”
Claim · model-written summary
Prince Edward Island isolates were highly sensitive to mefenoxam.
- Taxon
- potatoSolanum tuberosumt0
- Interactor
- Phytophthora erythroseptica
_with_Phytophthora_erythroseptica_zoospores_fmicb-10-00131-g003.jpg?width=60)
Phytophthora erythrosepticae1pathogen - Outcome
- isolates collected from P.E.I. were highly sensitive to mefenoxame0
- Value
- EC50 < 0.5 µg mefenoxam/mLe0
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“all field and single-zoospore isolates collected from P.E.I. were highly sensitive to mefenoxam (EC50 < 0.5 µg mefenoxam/mL)”
t0“potato”
e1“Phytophthora erythroseptica”
Claim · model-written summary
Maine tester isolates included sensitive, moderately resistant and highly resistant types.
- Taxon
- potatoSolanum tuberosumt0
- Interactor
- P. erythrosepticaPhytophthora erythrosepticae0pathogen
- Outcome
- sensitive, moderately resistant, or highly resistant to mefenoxame0
- Setting
- Mainee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tester isolates of P. erythroseptica from Maine were either sensitive, moderately resistant, or highly resistant to mefenoxam”
t0“potato”
Claim · model-written summary
Isolates inhibited on mefenoxam agar were suppressed in tubers after foliar treatment.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- foliar applications of the chemicale0
- Interactor
- Phytophthora erythrosepticaPhytophthora erythrosepticae1pathogen
- Outcome
- Isolatese0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Isolates that were inhibited on agar medium amended with mefenoxam were also suppressed in tubers from plants treated with foliar applications of the chemical”
t0“potato”
e1“Phytophthora erythroseptica”
Claim · model-written summary
One foliar application reduced pink rot incidence and severity significantly.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- One foliar application of mefenoxam at tuber initiatione0
- Interactor
- pink rote0pathogen
- Outcome
- pink rot incidence and severitye0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One foliar application of mefenoxam at tuber initiation was often sufficient to provide a significant (P = 0.05) reduction in pink rot incidence and severity”
t0“potato”
Claim · model-written summary
Two applications sometimes reduced pink rot more than one.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- two foliar applicationse0
- Outcome
- disease incidence and severitye0
- Direction
- reducede0
- Comparator
- a single applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two foliar applications (at tuber initiation and 2 weeks thereafter) reduced disease incidence and severity significantly (P = 0.05) more than a single application”
t0“potato”
Claim · model-written summary
Resistant Maine isolates infected tubers despite treatment.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- mefenoxame0
- Interactor
- P. erythrosepticaPhytophthora erythrosepticae0pathogen
- Outcome
- infected tuberse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tester isolates of P. erythroseptica from Maine designated as either moderately or highly resistant following the amended-agar assay, also infected tubers from plants treated with mefenoxam”
t0“potato”
Claim · model-written summary
Pink rot suppression was greater in Kennebec than Russet Burbank.
- Taxon
- potatoSolanum tuberosumt0
- Material
- 'Kennebec'e0
- Outcome
- suppression of pink rote0
- Direction
- greatere0
- Comparator
- 'Russet Burbank'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suppression of pink rot was greater in 'Kennebec' than 'Russet Burbank'”
t0“potato”
Claim · model-written summary
Fungicide efficacy declined in drier years.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- fungicide efficacye0
- Direction
- reducede0
- Setting
- drier yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fungicide efficacy was reduced in drier years”
t0“potato”
The same questions in other papers
metalaxyl-M · disease · Solanum tuberosum (potato)Results agree
2 papers in the same direction as this paper
- positive
- positive
application · disease · Solanum tuberosum (potato)Positive and negative results
66 papers in the same direction as this paper · 9 in the opposite direction · 1 reporting no difference from an alternative
- positive
- negative
- no effect
73 papers more in this group
See all 77 papers →application · Phytophthora erythroseptica · Solanum tuberosum (potato)Results agree
2 papers in the same direction as this paper
- positive
- 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.