Abstract
Aqueous extract of Melia azedarach seeds were tested against cabbage aphid, Brevicoryne brassicae, and its predator Coccinella septempunctata in a cabbage field. The field experiment was conducted at Bridge to Israel children village farm, around the vicinity of Tewodros campus, University of Gondar, where the cabbage was grown fully organically. A field experiment was started in the middle of April 2011 and completed at the end of May 2011. The experiment was conducted in a randomised block design (RBD). For the field trial, a total of 12 plots were prepared with 1 m2 area for data collection. The powdered M. azedarach seeds were used to prepare 5% concentration of aqueous solution and sprayed. Before spraying, percentage of aphid infestation was recorded from the control plot and the experimental plot. The average percentage of cabbage infestation in the control plot was 72% and in the experimental plot before treatment was 80.85%. The percentage reduction of aphid population was 19.06% after the first spraying. However, maximum percentage reduction of 86.5% was recorded after the completion of six-week treatment. The overall percentage reduction increased proportionately from the first to sixth week. The number of predator population was reduced and the reduction was not statistically significant (p > 0.05). The present study proved that Melia seed extracts were effective against cabbage aphids under field condition. Further, it is evident that the beneficial interaction between botanical extracts and biological control organism in the field showed safety to natural enemies. In conclusion, Melia seed extract can be useful for small-scale farmers to protect their cabbage crop against cabbage aphid, B. brassicae.
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Claims 6
Claim · model-written summary
Initial cabbage infestation was 72% in control plots.
- Taxon
- cabbage
Brassica oleracea var. capitatat0 - Outcome
- percentage of cabbage infestatione0
- Value
- 72%e0
- Comparator
- control plote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“average percentage of cabbage infestation in the control plot was 72%”
t0“cabbage”
Claim · model-written summary
Initial cabbage infestation was 80.85% in experimental plots.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Outcome
- experimental plote1
- Value
- 80.85%e0
- Qualifier
- before treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the experimental plot before treatment was 80.85%”
t0“cabbage”
e1“in the experimental plot before treatment was 80.85%”
Claim · model-written summary
The first spraying reduced aphid population by 19.06%.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Treatment
- first sprayinge0
- Interactor
- aphide0pest
- Outcome
- aphid populatione0
- Direction
- reductione0
- Value
- 19.06%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“percentage reduction of aphid population was 19.06% after the first spraying”
t0“cabbage”
Claim · model-written summary
Six weeks of treatment reduced aphid population by a maximum 86.5%.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Treatment
- six-week treatmente0
- Interactor
- cabbage aphid
.jpg?width=60)
Brevicoryne brassicaee2peste0 - Outcome
- percentage reductione1
- Direction
- reductione0
- Value
- 86.5%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“maximum percentage reduction of 86.5% was recorded after the completion of six-week treatment”
t0“cabbage”
e1“maximum percentage reduction of 86.5% was recorded after the completion of six-week treatment”
e2“Aqueous extract of Melia azedarach seeds were tested against cabbage aphid, Brevicoryne brassicae, and its predator Coccinella septempunctata in a cabbage field.”
Claim · model-written summary
Predator population declined nonsignificantly after treatment.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Treatment
- Aqueous extract of Melia azedarach seedse1
- Interactor
- predatore0biocontrol_agent
- Outcome
- predator populatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of predator population was reduced and the reduction was not statistically significant (p > 0.05)”
t0“cabbage”
e1“Aqueous extract of Melia azedarach seeds were tested against cabbage aphid, Brevicoryne brassicae, and its predator Coccinella septempunctata in a cabbage field.”
Claim · model-written summary
The authors recommend Melia seed extract for small-scale cabbage aphid control.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Interactor
- B. brassicaeBrevicoryne brassicaee0pest
- Outcome
- protect their cabbage crop against cabbage aphide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Melia seed extract can be useful for small-scale farmers to protect their cabbage crop against cabbage aphid, B. brassicae”
t0“cabbage”
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