Claim · model-written summary
In glasshouse experiments, severe defoliation increased stem canker severity from 4% to 24% compared with undefoliated plants.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse0 - Treatment
- severely defoliatede2
- Interactor
- Leptosphaeria maculans
Plenodomus lingame1pathogen - Outcome
- stem canker severitye2
- Direction
- increasede2
- Value
- from 4% to 24%e2
- Comparator
- undefoliated control plantse2
- Setting
- glasshouse experimentse2
Not reportedMaterialGeneCompoundOrgan / stageSecond interactorSecond interactor roleQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Canola ( Brassica napus ) crops for grazing and grain”
e1“Infection by Leptosphaeria maculans is the most prevalent disease in Australian canola crops”
e2“In glasshouse experiments, stem canker severity increased from 4% to 24% in severely defoliated plants, but light defoliation had no effect compared with undefoliated control plants”
Title
Susan J. Sprague; John A. Kirkegaard; Stephen J. Marcroft; et al. Annals of Applied Biology 2010. doi:10.1111/j.1744-7348.2010.00410.x
Other claims from this paper (9)
- Intervention effect Light defoliation had no effect on stem canker severity in glasshouse experiments compared with undefoliated control plants.
- Intervention effect Defoliation increased disease severity in all field experiments.
- Intervention effect Defoliation increased crown canker severity at Wagga Wagga from 22.6% to 39.3%.
- Intervention effect Defoliation increased crown canker severity at Canberra from 3.0% to 7.1%.
- Intervention effect Defoliation increased lodging at Naracoorte from 9.6% to 11.9%.
- Association The increase in disease severity with defoliation was smaller in canola lines with moderate to high stem canker resistance.
- Intervention effect Plants defoliated before stem elongation tended to develop less disease than plants defoliated during the reproductive phase.
- Recommendation Sowing cultivars with a high level of stem canker resistance can minimise the impact of grazing on L. maculans infection in canola.
- Recommendation Grazing during the vegetative stage before stem elongation can minimise the impact of grazing on L. maculans infection in canola.