Abstract
A study over two growing seasons evaluated the efficacy and cost effectiveness of azoxystrobin (Amistar® SC), applied at different action thresholds and plant growth stages, on the incidence and severity of common rust of maize grown in the Pukekohe, New Zealand. Azoxystrobin applied as a preventative before disease symptoms appeared, or at the onset of disease symptoms, gave equal or better control than fungicide applications applied at 3% and 6% rust thresholds. However, using a 3% disease threshold up to the tasselling stage to time the application of azoxystrobin, controlled common rust in the more severe rust season (2008–09) and saved fungicide application costs associated with preventative (calendar) or disease‐onset applications of azoxystrobin in the less severe rust season (2007–08) when the rust levels did not reach 3% by the tasselling stage. The maize hybrid 34D71 used was classified as moderately susceptible to common rust and, from the research presented here, it appears that although azoxystrobin applications reduced common rust severity, the lack of yield gains suggests that azoxystrobin applications in northern New Zealand may be economic only when growing highly susceptible maize varieties.
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Claims 7
Claim · model-written summary
Preventive or onset azoxystrobin gave equal or better rust control than 3% or 6% threshold applications.
- Treatment
- Azoxystrobin applied as a preventative before disease symptoms appeared, or at the onset of disease symptomse0
- Outcome
- controle0
- Direction
- equal or bettere0
- Comparator
- fungicide applications applied at 3% and 6% rust thresholdse0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“Azoxystrobin applied as a preventative before disease symptoms appeared, or at the onset of disease symptoms, gave equal or better control than fungicide applications applied at 3% and 6% rust thresholds.”
Claim · model-written summary
The 3% threshold through tasselling controlled common rust in the severe season.
- Treatment
- 3% disease threshold up to the tasselling stagee0
- Outcome
- common ruste0
- Direction
- controllede0
- Qualifier
- more severe rust season (2008–09)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“using a 3% disease threshold up to the tasselling stage to time the application of azoxystrobin, controlled common rust in the more severe rust season (2008–09)”
Claim · model-written summary
The 3% threshold saved application costs in the less severe season.
- Treatment
- 3%e0
- Outcome
- fungicide application costse0
- Direction
- savede0
- Comparator
- preventative (calendar) or disease‐onset applications of azoxystrobine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“saved fungicide application costs associated with preventative (calendar) or disease‐onset applications of azoxystrobin in the less severe rust season (2007–08) when the rust levels did not reach 3% by the tasselling stage”
Claim · model-written summary
Hybrid 34D71 was moderately susceptible to common rust.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maize hybrid 34D71 used was classified as moderately susceptible to common rust”
Claim · model-written summary
Azoxystrobin reduced common rust severity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“azoxystrobin applications reduced common rust severity”
Claim · model-written summary
Azoxystrobin applications produced no yield gains.
- Treatment
- azoxystrobin applicationse0
- Outcome
- yield gainse0
- Direction
- lack ofe0
- Setting
- northern New Zealande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“the lack of yield gains suggests that azoxystrobin applications in northern New Zealand may be economic only when growing highly susceptible maize varieties”
Claim · model-written summary
The authors suggest azoxystrobin in northern New Zealand may be economic only for highly susceptible maize varieties.
- Outcome
- azoxystrobin applications in northern New Zealand may be economic only when growing highly susceptible maize varietiese0
- Setting
- northern New Zealande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“azoxystrobin applications in northern New Zealand may be economic only when growing highly susceptible maize varieties”
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See all 12 papers →azoxystrobin · control · Zea mays (maize)Results agree
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azoxystrobin · disease · Zea mays (maize)Results agree
6 papers in the same direction as this paper
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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.