Abstract
A survey of Integrated Fruit Production and organic apple orchards in Hawkes Bay in 201011 investigated sensitivity of Venturia inaequalis isolates to demethylation inhibitor (DMI) and dodine fungicides EC50 values from mycelial growth assays for two DMIs showed continued loss of sensitivity since the 1990s Sensitivity was lower in orchards where DMI usage exceeded resistance management guidelines The most DMIsensitive isolates were found in one organic orchard Plant inoculations showed that black spot control of myclobutanilresistant V inaequalis strains by one application of myclobutanil was only 55 compared with 99 for myclobutanilsensitive strains The study suggests that resistance to DMI fungicides has continued to develop that loss of black spot control could be expected in some orchards and that DMI resistance management guidelines need reviewing There was high sensitivity to dodine in all orchards (mean EC50 of 024 mg/litre) and no evidence of increased resistance since the 1990s
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Claims 7
Claim · model-written summary
Venturia inaequalis isolates in apple orchards showed a continued loss of sensitivity to DMI fungicides since the 1990s.
- Taxon
- apple
Malus domesticae0 - Interactor
- Venturia inaequalis
Venturia inaequalise1pathogen - Outcome
- sensitivitye2
- Qualifier
- since the 1990se2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“survey of Integrated Fruit Production and organic apple orchards”
e1“investigated sensitivity of Venturia inaequalis isolates to demethylation inhibitor (DMI) and dodine fungicides”
e2“EC50 values from mycelial growth assays for two DMIs showed continued loss of sensitivity since the 1990s”
Claim · model-written summary
Sensitivity of Venturia inaequalis was lower in apple orchards where DMI usage exceeded resistance management guidelines.
- Taxon
- appleMalus domesticae0
- Treatment
- DMI usage exceeded resistance management guidelinese3
- Outcome
- Sensitivitye3
- Direction
- lowere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“survey of Integrated Fruit Production and organic apple orchards”
e3“Sensitivity was lower in orchards where DMI usage exceeded resistance management guidelines”
Claim · model-written summary
The most DMI-sensitive Venturia inaequalis isolates were found in one organic apple orchard.
- Taxon
- appleMalus domesticae0
- Interactor
- Venturia inaequalisVenturia inaequalise1pathogen
- Outcome
- DMIsensitive isolatese4
- Setting
- one organic orcharde4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“survey of Integrated Fruit Production and organic apple orchards”
e1“investigated sensitivity of Venturia inaequalis isolates to demethylation inhibitor (DMI) and dodine fungicides”
e4“The most DMIsensitive isolates were found in one organic orchard”
Claim · model-written summary
One application of myclobutanil controlled myclobutanil-resistant Venturia inaequalis strains much less well than sensitive strains: black spot control was 55 compared with 99.
- Taxon
- appleMalus domesticae0
- Treatment
- one application of myclobutanile5
- Interactor
- V inaequalisVenturia inaequalise5pathogen
- Outcome
- black spot controle5
- Direction
- lowerinferrede5
- Value
- 55 compared with 99e5
- Comparator
- myclobutanilsensitive strainse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“survey of Integrated Fruit Production and organic apple orchards”
e5“black spot control of myclobutanilresistant V inaequalis strains by one application of myclobutanil was only 55 compared with 99 for myclobutanilsensitive strains”
Claim · model-written summary
The authors recommend that DMI resistance management guidelines be reviewed.
- Taxon
- appleMalus domesticae0
- Outcome
- DMI resistance management guidelinese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“survey of Integrated Fruit Production and organic apple orchards”
e6“DMI resistance management guidelines need reviewing”
Claim · model-written summary
Sensitivity of Venturia inaequalis to dodine was high in all apple orchards (mean EC50 of 024 mg/litre).
- Taxon
- appleMalus domesticae0
- Treatment
- dodinee7
- Interactor
- Venturia inaequalisVenturia inaequalise1pathogen
- Outcome
- sensitivitye7
- Value
- 024 mg/litree7
- Setting
- all orchardse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“survey of Integrated Fruit Production and organic apple orchards”
e1“investigated sensitivity of Venturia inaequalis isolates to demethylation inhibitor (DMI) and dodine fungicides”
e7“There was high sensitivity to dodine in all orchards (mean EC50 of 024 mg/litre)”
Claim · model-written summary
No evidence of increased dodine resistance in Venturia inaequalis of apple orchards since the 1990s.
- Taxon
- appleMalus domesticae0
- Treatment
- dodinee1
- Interactor
- Venturia inaequalisVenturia inaequalise1pathogen
- Outcome
- increased resistancee2
- Qualifier
- since the 1990se2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“survey of Integrated Fruit Production and organic apple orchards”
e1“investigated sensitivity of Venturia inaequalis isolates to demethylation inhibitor (DMI) and dodine fungicides”
e2“no evidence of increased resistance since the 1990s”
The same questions in other papers
myclobutanil · Venturia inaequalis · Malus domestica (apple)Positive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 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.