Abstract
Brown rot is the most significant disease infecting peach orchards in the United States and is caused by the ascomycete Monilinia fructicola. Blossom blight, twig cankers and fruit rot are disease symptoms that develop over the course of a season. Demethylation inhibitor fungicides, or DMIs, have been used for over twenty years to effectively control brown rot. Quinone outside inhibitors (QoIs), also known as strobilurin fungicides, are a relatively new class of fungicides previously shown to control brown rot when applied as protectants. We examined the effects of azoxystrobin, trifloxystrobin and a mixture of pyraclostrobin + boscalid on blossom blight and fruit infections. Peach trees were sprayed at different rates, volumes and timing intervals to investigate the possible curative properties of these strobilurins. Results showed that the most effective fungicide to control colonization of a peach fruit was azoxystrobin. Sporulation of fruit infections, as well as blossom blight cankers, was best controlled by applications of trifloxystrobin. This fungicide reduced sporulation by 89% on fruit and 71% on cankers when applied at the highest labeled rate. These data indicated that in addition to their known protectant activity, QoI fungicides exhibit specific curative properties that provide control during other phases of the brown rot infection cycle. In recent years in the southeastern United States peach growing region, studies have found DMI-resistant isolates of M. fructicola. Eleven isolates of M. fructicola taken from Southern New Jersey were screened for resistance using a PCR-RFLP method. One out of the eleven isolates examined showed similar genetic components to those isolates resistant to DMI fungicides, indicating that resistant strains exist in New Jersey orchards. Given this finding, the incorporation of strobilurins into the commercial spray program will be an important and necessary strategy to avoiding widespread DMI resistance in New Jersey. Since our results demonstrated good to excellent curative properties, particularly as anti-sporulants, we hypothesize that early- to mid-season deployment of the strobilurins will provide the greatest benefit in reducing development of brown rot epidemics during the harvest season.
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Claims 6
Claim · model-written summary
Azoxystrobin was the most effective fungicide for controlling colonization of peach fruit by Monilinia fructicola.
- Taxon
- peach
Prunus persicat0 - Treatment
- azoxystrobine1
- Interactor
- Monilinia fructicola
Monilinia fructicolae0pathogen - Outcome
- colonization of a peach fruite1
- Direction
- most effectivee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach brown rot epidemics caused by monilinia fructicola”
e0“caused by the ascomycete Monilinia fructicola”
e1“Results showed that the most effective fungicide to control colonization of a peach fruit was azoxystrobin”
Claim · model-written summary
Trifloxystrobin reduced sporulation of fruit infections by 89% at the highest labeled rate.
- Taxon
- peachPrunus persicat0
- Treatment
- trifloxystrobine3
- Interactor
- Monilinia fructicolaMonilinia fructicolae0pathogen
- Outcome
- sporulation of fruit infectionse3
- Direction
- reducede2
- Value
- 89%e2
- Qualifier
- when applied at the highest labeled ratee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach brown rot epidemics caused by monilinia fructicola”
e0“caused by the ascomycete Monilinia fructicola”
e2“This fungicide reduced sporulation by 89% on fruit and 71% on cankers when applied at the highest labeled rate”
e3“Sporulation of fruit infections, as well as blossom blight cankers, was best controlled by applications of trifloxystrobin”
Claim · model-written summary
Trifloxystrobin reduced sporulation on blossom blight cankers by 71% at the highest labeled rate.
- Taxon
- peachPrunus persicat0
- Treatment
- trifloxystrobine3
- Interactor
- Monilinia fructicolaMonilinia fructicolae0pathogen
- Outcome
- sporulatione2
- Direction
- reducede2
- Value
- 71%e2
- Qualifier
- on cankers when applied at the highest labeled ratee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach brown rot epidemics caused by monilinia fructicola”
e0“caused by the ascomycete Monilinia fructicola”
e2“This fungicide reduced sporulation by 89% on fruit and 71% on cankers when applied at the highest labeled rate”
e3“Sporulation of fruit infections, as well as blossom blight cankers, was best controlled by applications of trifloxystrobin”
Claim · model-written summary
QoI fungicides showed good to excellent curative properties beyond their known protectant activity.
- Taxon
- peachPrunus persicat0
- Treatment
- QoI fungicidese5
- Outcome
- curative propertiese5
- Direction
- good to excellente6
- Comparator
- protectant activitye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach brown rot epidemics caused by monilinia fructicola”
e5“in addition to their known protectant activity, QoI fungicides exhibit specific curative properties that provide control during other phases of the brown rot infection cycle”
e6“Since our results demonstrated good to excellent curative properties, particularly as anti-sporulants”
Claim · model-written summary
One of eleven Monilinia fructicola isolates from Southern New Jersey showed genetic components similar to DMI-resistant isolates.
- Taxon
- peachPrunus persicat0
- Material
- Eleven isolates of M. fructicolae4
- Interactor
- Monilinia fructicolaMonilinia fructicolae0pathogen
- Outcome
- similar genetic components to those isolates resistant to DMI fungicidese7
- Value
- One out of the eleven isolatese7
- Setting
- Southern New Jerseye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach brown rot epidemics caused by monilinia fructicola”
e0“caused by the ascomycete Monilinia fructicola”
e7“One out of the eleven isolates examined showed similar genetic components to those isolates resistant to DMI fungicides”
e4“Eleven isolates of M. fructicola taken from Southern New Jersey were screened for resistance using a PCR-RFLP method”
Claim · model-written summary
The authors recommend incorporating strobilurins into the commercial peach spray program to avoid widespread DMI resistance in New Jersey.
- Taxon
- peachPrunus persicat0
- Outcome
- the incorporation of strobilurins into the commercial spray programe4
- Setting
- New Jerseye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach brown rot epidemics caused by monilinia fructicola”
e4“the incorporation of strobilurins into the commercial spray program will be an important and necessary strategy to avoiding widespread DMI resistance in New Jersey”
The same questions in other papers
azoxystrobin · Monilinia fructicola · Prunus persica (peach)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- no effect
- no effect
1 paper more in this group
See all 5 papers →trifloxystrobin · Monilinia fructicola · Prunus persica (peach)Results agree
1 paper in the same direction as this paper
- 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.