Abstract
Yield losses from infestations of root maggots (Delia spp.) (Diptera: Anthomyiidae) can be severe in canola crops in central Alberta. Studies were undertaken in central Alberta, Canada to manipulate agronomic practices that have potential to affect crop yield, root maggot infestations, and the survival and abundance of Aleochara bilineata (Coleoptera: Staphylinidae), which is an important natural enemy of root maggots. I investigated tillage regime (conventional versus zero tillage), row spacing, and seeding rate to assess effects on Delia spp. and A. bilineata populations. In general I observed greater root maggot incidence and damage, and greater activity density of A. bilineata, in plots subjected to a conventional tillage regime than in a zero tillage regime. I found relatively greater parasitism of root maggot puparia by A. bilineata in plots subjected to a zero tillage regime than a conventional tillage regime. No consistent effects were observed on A. bilineata activity in relation to seeding rate and row spacing. In this study, there is no evidence to conclude that tillage regime had a significant effect on canola seed yield. Seed yields in relation to seeding rate and row spacing were variable. In the context of integrated pest management in canola cropping systems, I suggest that canola growers utilize zero tillage in conjunction with adopting the currently recommended seeding rates of between 5.6 to 9.0 kg per ha and row spacing of 30 cm because this can bring advantages in terms of improved management of root maggots and other important canola pests like flea beetles and weeds.
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Claims 7
Claim · model-written summary
Conventional tillage had greater root maggot incidence and damage than zero tillage.
- Treatment
- conventional tillage regimee0
- Interactor
- root maggote0pest
- Outcome
- root maggot incidence and damagee0
- Direction
- greatere0
- Comparator
- zero tillage regimee0
Not reportedTaxon
Verbatim
e0“greater root maggot incidence and damage, and greater activity density of A. bilineata, in plots subjected to a conventional tillage regime than in a zero tillage regime”
Claim · model-written summary
Conventional tillage had greater A. bilineata activity density.
- Treatment
- conventional tillage regimee0
- Interactor
- A. bilineata
Aleochara bilineatae0biocontrol_agent - Outcome
- activity density of A. bilineatae0
- Direction
- greatere0
- Comparator
- zero tillage regimee0
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater activity density of A. bilineata, in plots subjected to a conventional tillage regime than in a zero tillage regime”
Claim · model-written summary
Zero tillage had greater parasitism of root maggot puparia by A. bilineata.
- Treatment
- zero tillage regimee0
- Interactor
- root maggote0pest
- Second interactor
- A. bilineataAleochara bilineatae0biocontrol_agent
- Outcome
- parasitism of root maggot pupariae0
- Direction
- greatere0
- Comparator
- conventional tillage regimee0
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater parasitism of root maggot puparia by A. bilineata in plots subjected to a zero tillage regime than a conventional tillage regime”
Claim · model-written summary
Seeding rate and row spacing had no consistent effects on A. bilineata activity.
- Treatment
- seeding rate and row spacinge0
- Interactor
- A. bilineataAleochara bilineatae0biocontrol_agent
- Outcome
- A. bilineata activitye0
- Direction
- No consistent effectse0
Not reportedTaxonComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No consistent effects were observed on A. bilineata activity in relation to seeding rate and row spacing”
Claim · model-written summary
Tillage regime showed no evidence of a significant effect on canola seed yield.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Treatment
- tillage regimee0
- Outcome
- canola seed yielde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“there is no evidence to conclude that tillage regime had a significant effect on canola seed yield”
Claim · model-written summary
Seed yields varied with seeding rate and row spacing.
Not reportedTaxon
Verbatim
e0“Seed yields in relation to seeding rate and row spacing were variable”
Claim · model-written summary
The author recommends zero tillage with recommended seeding rates and row spacing.
- Taxon
- canolaBrassica napus var. napuse0
- Outcome
- utilize zero tillage in conjunction with adopting the currently recommended seeding rates of between 5.6 to 9.0 kg per ha and row spacing of 30 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola growers utilize zero tillage in conjunction with adopting the currently recommended seeding rates of between 5.6 to 9.0 kg per ha and row spacing of 30 cm”
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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.