Abstract
Over 10 years of field trials show reductions of most of the pests in Brassicas undersown by clover. The pest-reducing effects are due to the 'appropriate / inappropriate landings' hypothesis (Finch, 1996), and the 'host plant quality' hypothesis (Theunissen, 1994). To find out the mechanisms within the 'host plant quality' hypothesis in the most promising intercropping (collards undersown by clover) glasshouse experiments were conducted to see whether intercropping influences the mean relative growth rate, fecundity and time of maturity of Myzus persicae (Sulzer) (Homoptera: Aphididae) a common pest of Brassicas. The treatment modelling intercropping showed the smallest mean relative growth rate, delayed the maturity and slowed down the growth of cabbages. The treatment modelling monocropping showed the highest mean relative growth rate and the maturity was reached earlier. These results may indicate that intercropping delays the growth of settled aphid populations, giving another proof that in the case of clover undersown cabbages the 'host plant quality' hypothesis is likely to be acting. The differences between treatments where the roots of clover and cabbages were separated and allowed to grow together suggest that the effect is via the roots by competition.
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Claims 7
Claim · model-written summary
Clover undersowing reduced most Brassica pests.
Brassica
TrifoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field trials show reductions of most of the pests in Brassicas undersown by clover”
Claim · model-written summary
The intercropping model gave the smallest aphid relative growth rate.
- Taxon
- cabbage
Brassica oleracea var. capitatat0 - Treatment
- modelling intercroppinge0
- Outcome
- mean relative growth ratee0
- Direction
- smalleste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment modelling intercropping showed the smallest mean relative growth rate”
t0“cabbage”
t1“clover”
Claim · model-written summary
The intercropping model delayed aphid maturity.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Treatment
- intercroppingt0
- Outcome
- maturitye0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“delayed the maturity”
t0“cabbage-clover intercropping”
Claim · model-written summary
The intercropping model slowed cabbage growth.
- Taxon
- cabbagesBrassica oleracea var. capitatae0
- Treatment
- intercroppingt0
- Outcome
- growth of cabbagese0
- Direction
- slowed downe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“slowed down the growth of cabbages”
t0“cabbage-clover intercropping”
Claim · model-written summary
The monocropping model gave the highest aphid growth rate.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Treatment
- modelling monocroppinge0
- Outcome
- mean relative growth ratee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment modelling monocropping showed the highest mean relative growth rate”
t0“cabbage”
Claim · model-written summary
The monocropping model led to earlier aphid maturity.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Outcome
- maturitye0
- Direction
- earliere0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maturity was reached earlier”
t0“cabbage”
Claim · model-written summary
The authors inferred root competition as the likely mechanism.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Outcome
- effecte0
- Qualifier
- via the roots by competitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect is via the roots by competition”
t0“cabbage-clover intercropping”
The same questions in other papers
intercropping · growth · Brassica oleracea (wild cabbage)Positive and negative results
1 paper in the same direction as this paper · 12 in the opposite direction
- positive
- positive
- positive
10 papers more in this group
See all 14 papers →intercropping · phenology · Brassica oleracea (wild cabbage)Results agree
1 paper in the same direction as this paper
- positive
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.