Abstract
The impact of three different doses of botanical insecticide derived from the syringa tree, Melia azedarach and the neem tree, Azadirachta indica was tested on the behaviour of the diamondback moth, Plutella xylostella (Linnaeus). Both botanical insecticides had a significant impact on larval behaviour. At higher doses the extracts showed feeding deterrent activity, with larvae preferring the untreated sides of cabbage leaves and consuming less of the treated half of cabbage leaves. The botanical insecticides had less of an effect on the oviposition behaviour of P. xylostella moths. In laboratory and glasshouse trials, significantly fewer eggs were oviposited on the plants that had been treated with syringa extracts. Therefore, the syringa extracts appear to have a repellent effect. In contrast, when exposed to the neem extracts the moths did not discriminate between control plants and treated plants. Behavioural observation indicated that, despite the lower number of eggs oviposited on cabbage treated with syringa extracts, the moths chose cabbage treated with the highest dose of syringa more often than they chose control cabbage plants. Similar observations were found in cabbage plants treated with neem, moths chose the medium dose more often than they chose the control. Oviposition and feeding deterrent properties are important factors in pest control, and results from this study indicate that botanical insecticides have the potential to be incorporated into control programmes for P. xylostella in South Africa.
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Claims 8
Claim · model-written summary
Both botanical insecticides had a significant impact on diamondback moth larval behaviour.
- Taxon
- cabbage
Brassica oleracea var. capitatae0 - Treatment
- botanical insecticidese1
- Outcome
- larval behavioure1
- Direction
- had a significant impacte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At higher doses the extracts showed feeding deterrent activity, with larvae preferring the untreated sides of cabbage leaves and consuming less of the treated half of cabbage leaves”
e1“Both botanical insecticides had a significant impact on larval behaviour”
Claim · model-written summary
At higher doses the extracts were feeding deterrent to larvae, which consumed less of the treated cabbage leaves.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- higher dosese0
- Interactor
- larvaee0pest
- Outcome
- feeding deterrent activitye0
- Direction
- decreaseinferrede0
- Comparator
- untreated sides of cabbage leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At higher doses the extracts showed feeding deterrent activity, with larvae preferring the untreated sides of cabbage leaves and consuming less of the treated half of cabbage leaves”
Claim · model-written summary
Syringa extracts significantly reduced the number of eggs oviposited on treated cabbage plants.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- syringa extractse1
- Outcome
- eggs were ovipositede1
- Direction
- fewere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At higher doses the extracts showed feeding deterrent activity, with larvae preferring the untreated sides of cabbage leaves and consuming less of the treated half of cabbage leaves”
e1“significantly fewer eggs were oviposited on the plants that had been treated with syringa extracts”
Claim · model-written summary
Syringa extracts appear to have a repellent effect on diamondback moth oviposition.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- syringa extractse1
- Outcome
- repellent effecte1
- Direction
- decreaseinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the moths chose cabbage treated with the highest dose of syringa more often than they chose control cabbage plants”
e1“Therefore, the syringa extracts appear to have a repellent effect”
Claim · model-written summary
When exposed to neem extracts, moths did not discriminate between control and treated cabbage plants.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- neem extractse1
- Interactor
- mothse1pest
- Outcome
- discriminate between control plants and treated plantse1
- Direction
- did not discriminatee1
- Comparator
- control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar observations were found in cabbage plants treated with neem, moths chose the medium dose more often than they chose the control”
e1“when exposed to the neem extracts the moths did not discriminate between control plants and treated plants”
Claim · model-written summary
Moths chose cabbage treated with the highest dose of syringa more often than control cabbage.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- highest dose of syringae0
- Interactor
- mothse0pest
- Outcome
- chose cabbage treated with the highest dose of syringae0
- Direction
- more oftene0
- Comparator
- control cabbage plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the moths chose cabbage treated with the highest dose of syringa more often than they chose control cabbage plants”
Claim · model-written summary
Moths chose the medium neem dose more often than the control on cabbage.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- neeme0
- Interactor
- mothse0pest
- Outcome
- chose the medium dosee0
- Direction
- more oftene0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar observations were found in cabbage plants treated with neem, moths chose the medium dose more often than they chose the control”
Claim · model-written summary
Botanical insecticides should be incorporated into control programmes for P. xylostella.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Interactor
- P. xylostellae1pest
- Outcome
- incorporated into control programmes for P. xylostellae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the moths chose cabbage treated with the highest dose of syringa more often than they chose control cabbage plants”
e1“botanical insecticides have the potential to be incorporated into control programmes for P. xylostella in South Africa”
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