Abstract
Abstract The temporal aspects of the effect of feeding damage to canola seedlings by adult flea beetles on yield were determined by protecting plants in 0.836-m 2 field plots from beetle attack with screen cages for varying periods. Yield was reduced most when plants were damaged during stages 1.0–2.2, 5–10 days after germination, but was not reduced when they were damaged after reaching stages 2.3–2.4, 20 days after germination. Plots exposed to attack for periods greater than 5 days before protection had smaller yields and fewer plants than plots protected from the time of germination for 5 or more days before exposure to flea beetle attack. Yield losses caused by larvae were measured by growing plants inside field cages to stage 2.3–2.4 before exposing them to feral adults to establish larval populations; yields of plots treated subsequently with drenches of carbofuran to kill larvae were then compared with yields of untreated plots. A yield loss of 5% was observed at larval densities of 0.16/cm 2 , estimated from soil core samples and captures of adults in emergence cages. The results confirm that continuous protection of canola during and after germination is superior to post-germination protection and suggest that activities of flea beetle larvae reduce yield.
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Claims 7
Claim · model-written summary
Canola yield was reduced most when seedlings were damaged by adult flea beetles during stages 1.0–2.2, 5–10 days after germination.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Treatment
- damaged during stages 1.0–2.2, 5–10 days after germinatione1
- Interactor
- adult flea beetlese0pest
- Outcome
- Yielde1
- Direction
- reduced moste1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“feeding damage to canola seedlings by adult flea beetles”
e1“Yield was reduced most when plants were damaged during stages 1.0–2.2, 5–10 days after germination”
Claim · model-written summary
Canola yield was not reduced when plants were damaged after reaching stages 2.3–2.4, 20 days after germination.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- damaged after reaching stages 2.3–2.4, 20 days after germinatione1
- Interactor
- adult flea beetlese0pest
- Outcome
- Yielde1
- Direction
- not reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“feeding damage to canola seedlings by adult flea beetles”
e1“Yield was reduced most when plants were damaged during stages 1.0–2.2, 5–10 days after germination, but was not reduced when they were damaged after reaching stages 2.3–2.4, 20 days after germination”
Claim · model-written summary
Canola plots exposed to flea beetle attack for more than 5 days before protection had smaller yields than plots protected from germination for 5 or more days before exposure.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- exposed to attack for periods greater than 5 days before protectione1
- Interactor
- flea beetlee1pest
- Outcome
- yieldse1
- Direction
- smallere1
- Comparator
- plots protected from the time of germination for 5 or more days before exposure to flea beetle attacke1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“feeding damage to canola seedlings by adult flea beetles”
e1“Plots exposed to attack for periods greater than 5 days before protection had smaller yields and fewer plants than plots protected from the time of germination for 5 or more days before exposure to flea beetle attack”
Claim · model-written summary
Canola plots exposed to flea beetle attack for more than 5 days before protection had fewer plants than plots protected from germination for 5 or more days before exposure.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- exposed to attack for periods greater than 5 days before protectione1
- Interactor
- flea beetlee1pest
- Outcome
- plantse1
- Direction
- fewere1
- Comparator
- plots protected from the time of germination for 5 or more days before exposure to flea beetle attacke1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“feeding damage to canola seedlings by adult flea beetles”
e1“Plots exposed to attack for periods greater than 5 days before protection had smaller yields and fewer plants than plots protected from the time of germination for 5 or more days before exposure to flea beetle attack”
Claim · model-written summary
A canola yield loss of 5% was observed at flea beetle larval densities of 0.16/cm2.
- Taxon
- canolaBrassica napus var. napuse0
- Outcome
- yield losse1
- Value
- 5%e1
- Qualifier
- larval densities of 0.16/cm 2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“feeding damage to canola seedlings by adult flea beetles”
e1“A yield loss of 5% was observed at larval densities of 0.16/cm 2”
Claim · model-written summary
Continuous protection of canola during and after germination is superior to post-germination protection.
- Taxon
- canolaBrassica napus var. napuse1
- Treatment
- continuous protectione1
- Outcome
- superiore1
- Direction
- superiore1
- Comparator
- post-germination protectione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“feeding damage to canola seedlings by adult flea beetles”
e1“continuous protection of canola during and after germination is superior to post-germination protection”
Claim · model-written summary
The results suggest that the activities of flea beetle larvae reduce canola yield.
- Taxon
- canolaBrassica napus var. napuse0
- Interactor
- flea beetle larvaee1pest
- Outcome
- yielde1
- Direction
- reducee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“feeding damage to canola seedlings by adult flea beetles”
e1“suggest that activities of flea beetle larvae reduce yield”
The same questions in other papers
processing · yield · Brassica napus (oilseed rape)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
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.