Abstract
The efficacy of five fungicide seed treatments as a management tool against blackleg on spring canola was evaluated under greenhouse and field conditions in North Dakota. Blackleg, caused by Leptosphaeria maculans, inflicts the greatest yield losses when infecting seedlings before they reach the six-leaf growth stage. In greenhouse studies, 10-day-old seedlings were inoculated with L. maculans spore suspensions and evaluated 12 days later and at maturity or inoculated 12, 20, or 28 days after planting and evaluated at maturity. In field trials conducted in 2017 and 2018, severity was assessed at maturity. In the greenhouse, all fungicide seed treatments reduced (P = 0.05) disease severity at the seedling stage, but only the protection provided by Obvius (fluxapyroxad + pyraclostrobin + metalaxyl) and Helix Vibrance (mefenoxam + fludioxonil + sedaxane + difenoconazole + thiamethoxam) reduced (P < 0.05) severity at the adult stage; however, none of them provide effective protection when plants were inoculated 20 days after planting or later. In field trials, none of the treatments significantly (P > 0.05) improved plant stand and yield or reduced disease incidence and severity. Although fungicide seed treatment is a valuable tool, it should not be used as the only method to manage blackleg disease.
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Claims 7
Claim · model-written summary
In the greenhouse, all fungicide seed treatments reduced blackleg disease severity at the seedling stage of spring canola.
- Taxon
- spring canola
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Brassica napus var. napuse0 - Organ / stage
- seedling stagee2
- Treatment
- fungicide seed treatmentse2
- Interactor
- Leptosphaeria maculans
Plenodomus lingame1pathogen - Outcome
- disease severitye2
- Direction
- reducede2
- Setting
- greenhousee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“management tool against blackleg on spring canola”
e1“Blackleg, caused by Leptosphaeria maculans”
e2“In the greenhouse, all fungicide seed treatments reduced (P = 0.05) disease severity at the seedling stage”
Claim · model-written summary
Obvius reduced blackleg severity of spring canola at the adult stage in the greenhouse.
- Taxon
- spring canolaBrassica napus var. napuse0
- Organ / stage
- adult stagee3
- Treatment
- Obvius (fluxapyroxad + pyraclostrobin + metalaxyl)e3
- Interactor
- Leptosphaeria maculansPlenodomus lingame1pathogen
- Outcome
- severitye3
- Direction
- reducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“management tool against blackleg on spring canola”
e1“Blackleg, caused by Leptosphaeria maculans”
e3“but only the protection provided by Obvius (fluxapyroxad + pyraclostrobin + metalaxyl) and Helix Vibrance (mefenoxam + fludioxonil + sedaxane + difenoconazole + thiamethoxam) reduced (P < 0.05) severity at the adult stage”
Claim · model-written summary
Helix Vibrance reduced blackleg severity of spring canola at the adult stage in the greenhouse.
- Taxon
- spring canolaBrassica napus var. napuse0
- Organ / stage
- adult stagee3
- Treatment
- Helix Vibrance (mefenoxam + fludioxonil + sedaxane + difenoconazole + thiamethoxam)e3
- Interactor
- Leptosphaeria maculansPlenodomus lingame1pathogen
- Outcome
- severitye3
- Direction
- reducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“management tool against blackleg on spring canola”
e1“Blackleg, caused by Leptosphaeria maculans”
e3“but only the protection provided by Obvius (fluxapyroxad + pyraclostrobin + metalaxyl) and Helix Vibrance (mefenoxam + fludioxonil + sedaxane + difenoconazole + thiamethoxam) reduced (P < 0.05) severity at the adult stage”
Claim · model-written summary
Fungicide seed treatments did not provide effective protection when spring canola plants were inoculated 20 days after planting or later.
- Taxon
- spring canolaBrassica napus var. napuse0
- Treatment
- fungicide seed treatmentse2
- Outcome
- effective protectione4
- Qualifier
- inoculated 20 days after planting or latere4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“management tool against blackleg on spring canola”
e2“In the greenhouse, all fungicide seed treatments reduced (P = 0.05) disease severity at the seedling stage”
e4“none of them provide effective protection when plants were inoculated 20 days after planting or later”
Claim · model-written summary
In field trials, fungicide seed treatments did not significantly improve spring canola plant stand or yield.
- Taxon
- spring canolaBrassica napus var. napuse0
- Treatment
- fungicide seed treatmentse2
- Outcome
- plant stand and yielde5
- Direction
- improvede5
- Setting
- field trialse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“management tool against blackleg on spring canola”
e2“efficacy of five fungicide seed treatments”
e5“In field trials, none of the treatments significantly (P > 0.05) improved plant stand and yield or reduced disease incidence and severity”
Claim · model-written summary
In field trials, fungicide seed treatments did not significantly reduce blackleg incidence and severity in spring canola.
- Taxon
- spring canolaBrassica napus var. napuse0
- Treatment
- fungicide seed treatmentse2
- Interactor
- Leptosphaeria maculansPlenodomus lingame1pathogen
- Outcome
- disease incidence and severitye5
- Direction
- reducede5
- Setting
- field trialse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“management tool against blackleg on spring canola”
e1“Blackleg, caused by Leptosphaeria maculans”
e2“efficacy of five fungicide seed treatments”
e5“In field trials, none of the treatments significantly (P > 0.05) improved plant stand and yield or reduced disease incidence and severity”
Claim · model-written summary
Fungicide seed treatment should not be used as the only method to manage blackleg disease in spring canola.
- Taxon
- spring canolaBrassica napus var. napuse0
- Outcome
- as the only method to manage blackleg diseasee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“management tool against blackleg on spring canola”
e6“it should not be used as the only method to manage blackleg disease”
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