Abstract
Demethylation inhibitor (DMI) fungicides are an effective means to manage apple scab caused by Venturia inaequalis. Unfortunately, practical resistance to DMI fungicide chemistries is prevalent in populations in New York and the New England states. Management practices that delay the development of DMI resistance in V. inaequalis populations are highly desired by regional apple producers. Trials were conducted in a New York apple orchard during the 2011 and 2012 growing seasons to determine the impact of delayed-dormant (after bud break, but prior to green tissue) chemical treatments on the DMI sensitivity of a V. inaequalis population with stable resistance to DMI fungicides. Delayed-dormant treatment programs consisted of either an application of a copper fungicide, a manganese sanitation product, a DMI fungicide (myclobutanil), or no fungicide. Sensitivity to the DMI fungicide myclobutanil was evaluated for a minimum of 25 V. inaequalis single lesion conidial isolates from each of four replicated treatment blocks. In both years, mean percent relative growth on myclobutanil amended media for V. inaequalis isolates from the copper treatment program were significantly (P < 0.05) lower than isolates from blocks did not receive a delayed dormant fungicide treatment. The effect of the manganese treatment was inconsistent between years. V. inaequalis isolates collected from the myclobutanil treatment program were not significantly (P > 0.05) different in myclobutanil sensitivity from isolates collected from the blocks that did not receive a delayed dormant fungicide treatment. Overall, the results suggest that delayed dormant treatments of copper may favorably impact the myclobutanil sensitivity for a population of V. inaequalis with resistance to DMI fungicides, and should be considered as a standard management practice in apple production.
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Claims 4
Claim · model-written summary
V. inaequalis isolates from copper-treated blocks showed significantly lower relative growth on myclobutanil media than isolates from untreated blocks in both years.
- Taxon
- apple
Malus domesticae2 - Treatment
- copper treatment programe1
- Interactor
- V. inaequalis
Venturia inaequalise1pathogen - Outcome
- mean percent relative growth on myclobutanil amended mediae1
- Direction
- lowere1
- Comparator
- blocks did not receive a delayed dormant fungicide treatmente1
- Setting
- New York apple orcharde2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“mean percent relative growth on myclobutanil amended media for V. inaequalis isolates from the copper treatment program were significantly (P < 0.05) lower than isolates from blocks did not receive a delayed dormant fungicide treatment”
e2“Trials were conducted in a New York apple orchard”
Claim · model-written summary
The effect of the manganese treatment on sensitivity was inconsistent between years.
- Taxon
- appleMalus domesticae2
- Treatment
- manganese treatmente1
- Outcome
- effect of the manganese treatment was inconsistente1
- Setting
- New York apple orcharde2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effect of the manganese treatment was inconsistent between years”
e2“Trials were conducted in a New York apple orchard”
Claim · model-written summary
Isolates from myclobutanil-treated blocks did not differ significantly in myclobutanil sensitivity from isolates of untreated blocks.
- Taxon
- appleMalus domesticae2
- Treatment
- myclobutanil treatment programe1
- Interactor
- V. inaequalisVenturia inaequalise1pathogen
- Outcome
- myclobutanil sensitivitye1
- Direction
- not significantly (P > 0.05) differente1
- Comparator
- blocks that did not receive a delayed dormant fungicide treatmente1
- Setting
- New York apple orcharde2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“V. inaequalis isolates collected from the myclobutanil treatment program were not significantly (P > 0.05) different in myclobutanil sensitivity from isolates collected from the blocks that did not receive a delayed dormant fungicide treatment”
e2“Trials were conducted in a New York apple orchard”
Claim · model-written summary
Delayed-dormant copper treatments may favorably affect myclobutanil sensitivity and should be a standard management practice in apple production.
- Taxon
- appleMalus domesticae1
- Treatment
- delayed dormant treatments of coppere1
- Interactor
- V. inaequalisVenturia inaequalise1pathogen
- Outcome
- standard management practicee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Overall, the results suggest that delayed dormant treatments of copper may favorably impact the myclobutanil sensitivity for a population of V. inaequalis with resistance to DMI fungicides, and should be considered as a standard management practice in apple production”
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 reporting no difference from an alternative
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →copper atom · Venturia inaequalis · Malus domestica (apple)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.