Abstract
Quinone outside inhibitor (QoI) foliar fungicides can be effective at reducing foliar diseases in corn (Zea mays), and they have been shown to provide physiological benefits experimentally in other crops in the absence of disease. A new supplemental label for pyraclostrobin that was approved in January 2009 by the United States Environmental Protection Agency (EPA) states that corn plants applied with pyraclostrobin may have better tolerance to damage caused by hail. To determine the effects of QoI foliar fungicides on hail-damaged corn, field research trials were conducted near Champaign, IL in 2007 and 2008. Hail damage was simulated with a gasoline-powered string-mower at the V12 growth stage, which caused injury to leaves and defoliation. At VT, the foliar fungicides azoxystrobin and pyraclostrobin were applied to corn. Control treatments included a nontreated control and a nondamaged control. The simulated hail damage significantly (P ≤ 0.05) increased gray leaf spot severity (caused by Cercospora zeae-maydis) in 2007 but not in 2008. Simulated hail damage also significantly reduced yield compared with the nondamaged control in both 2007 and 2008. Foliar fungicides significantly reduced disease severity compared with the nontreated control in 2007 but not in 2008; however, foliar fungicides did not significantly improve yield in either the damaged or nondamaged plots compared with the nontreated controls. Results from our research trials indicated that foliar fungicides provided very little benefit to corn injured by simulated hail; thus, growers should consider factors other than hail damage when making fungicide application decisions for corn.
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Claims 7
Claim · model-written summary
Simulated hail increased gray leaf spot severity in 2007.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- simulated hail damagee0
- Interactor
- Cercospora zeae-maydis
Cercospora zeae-maydise0pathogen - Outcome
- gray leaf spot severitye0
- Direction
- increasede0
- Setting
- 2007e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The simulated hail damage significantly (P ≤ 0.05) increased gray leaf spot severity (caused by Cercospora zeae-maydis) in 2007 but not in 2008.”
t0“Corn”
Claim · model-written summary
Simulated hail did not significantly increase gray leaf spot severity in 2008.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- simulated hail damagee0
- Interactor
- Cercospora zeae-maydisCercospora zeae-maydise0pathogen
- Outcome
- gray leaf spot severitye0
- Setting
- 2008e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The simulated hail damage significantly (P ≤ 0.05) increased gray leaf spot severity (caused by Cercospora zeae-maydis) in 2007 but not in 2008.”
t0“Corn”
Claim · model-written summary
Simulated hail reduced corn yield in 2007 and 2008.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Simulated hail damagee0
- Outcome
- yielde0
- Direction
- reducede0
- Qualifier
- both 2007 and 2008e0
- Comparator
- nondamaged controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Simulated hail damage also significantly reduced yield compared with the nondamaged control in both 2007 and 2008.”
t0“Corn”
Claim · model-written summary
Foliar fungicides reduced disease severity in 2007.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Foliar fungicidese0
- Outcome
- disease severitye0
- Direction
- reducede0
- Comparator
- nontreated controle0
- Setting
- 2007e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar fungicides significantly reduced disease severity compared with the nontreated control in 2007 but not in 2008;”
t0“Corn”
Claim · model-written summary
Foliar fungicides did not significantly reduce disease severity in 2008.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Foliar fungicidese0
- Outcome
- disease severitye0
- Comparator
- nontreated controle0
- Setting
- 2008e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar fungicides significantly reduced disease severity compared with the nontreated control in 2007 but not in 2008;”
t0“Corn”
Claim · model-written summary
Foliar fungicides did not significantly improve yield in damaged or nondamaged plots.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- foliar fungicidese0
- Outcome
- yielde0
- Direction
- did not significantly improvee0
- Qualifier
- either the damaged or nondamaged plotse0
- Comparator
- nontreated controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar fungicides did not significantly improve yield in either the damaged or nondamaged plots compared with the nontreated controls.”
t0“Corn”
Claim · model-written summary
Growers should consider factors other than hail damage when deciding on fungicide application.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- consider factors other than hail damage when making fungicide application decisionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growers should consider factors other than hail damage when making fungicide application decisions for corn.”
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See all 629 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.