Abstract
Abstract Studies on the effect of a purified extract of fruits of Azadirachta indica on Leptinotarsa decemlineata Say (Coleoptera, Chrysomelidae ) A purified extract of fruits of A. indica was tested under laboratory conditions against larvae of the Colorado beetle by foliar and topical application. The extract caused on obvious inhibition of postembryonic development. Furthermore antifeeding activity could be proved by weighing the larvae. Feeding of adult beetles for a period of 5 days on potato plants sprayed with the extract at a concentration of 100 ppm caused a decrease of reproduction exceeding 98 %. A field trial with third instar larvae resulted in complete mortality of them after feeding on treated potato plants. Zusammenfassung Die Wirkung eines gereinigten Extraktes aus Früchten von A. indica wurde im Labor an Larven des Kartoffelkäfers ( L. decemlineata ) durch Verfütterung behandelter Kartoffel‐pflanzen und topikale Applikation untersucht. In beiden Fällen konnte starke Entwicklungshemmung festgestellt werden. Eine fraßabschreckende Wirkung wurde durch Gewichts‐kontrollen bei Larven nachgewiesen. Die Reproduktion von L. decemlineata wurde durch den gereinigten Fruchtextrakt um mehr als 98% vermindert, wenn Imagines während ihrer reproduktiven Phase 5 Tage lang an Kartoffelpflanzen fraßen, die mit A. indica ‐Frucht‐extrakt in einer Konzentration von 100 ppm behandelt worden waren. In einem Freiland‐versuch mit L 3 konnte unter Einwirkung der getesteten Substanz eine 100%ige Mortalität der Versuchstiere festgestellt werden.
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Claims 4
Claim · model-written summary
The extract inhibited larval postembryonic development.
- Taxon
- Azadirachta indica
.jpg?width=60)
Azadirachta indicat0 - Treatment
- The extracte0
- Interactor
- Leptinotarsa decemlineata Say
Leptinotarsa decemlineatat0pest - Outcome
- postembryonic developmente0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The extract caused on obvious inhibition of postembryonic development.”
t0“Azadirachta indica A. Juss auf Leptinotarsa decemlineata Say”
Claim · model-written summary
The extract had an antifeeding effect on larvae.
- Taxon
- Azadirachta indicaAzadirachta indicat0
- Treatment
- extracte0
- Interactor
- Leptinotarsa decemlineata SayLeptinotarsa decemlineatat0pest
- Outcome
- antifeeding activitye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extract caused on obvious inhibition of postembryonic development. Furthermore antifeeding activity could be proved by weighing the larvae.”
t0“Azadirachta indica A. Juss auf Leptinotarsa decemlineata Say”
Claim · model-written summary
Feeding on treated potato plants reduced adult beetle reproduction by more than 98%.
- Taxon
- potato plants
Solanum tuberosume0 - Treatment
- sprayed with the extract at a concentration of 100 ppme0
- Interactor
- adult beetlese0pest
- Outcome
- reproductione0
- Direction
- decreasee0
- Value
- exceeding 98 %e0
- Qualifier
- for a period of 5 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Feeding of adult beetles for a period of 5 days on potato plants sprayed with the extract at a concentration of 100 ppm caused a decrease of reproduction exceeding 98 %.”
Claim · model-written summary
Third instar larvae had complete mortality after feeding on treated potato plants in a field trial.
- Taxon
- potato plantsSolanum tuberosume0
- Treatment
- treated potato plantse0
- Interactor
- larvaee0pest
- Outcome
- mortalitye0
- Direction
- completee0
- Value
- complete mortalitye0
- Setting
- field triale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A field trial with third instar larvae resulted in complete mortality of them after feeding on treated potato plants.”
The same questions in other papers
application · pest · Solanum tuberosum (potato)Positive and negative results
27 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- negative
- negative
29 papers more in this group
See all 33 papers →botanical · pest · Solanum tuberosum (potato)Positive and negative results
31 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- no effect
- negative
32 papers more in this group
See all 36 papers →botanical · Leptinotarsa decemlineata · Azadirachta indica (neem)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.