Abstract
Cultivated potato, Solanum tuberosum (Solanaceae), is a key host of the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae). This important defoliating pest is recalcitrantly resistant to multiple classes of synthetic insecticides when overused. Hence, there is a continual search for novel active ingredients, such as biopesticides, which hold promise but are poorly explored. Here, variable doses [stock, high, mild, and low at 0.2, 0.1, 0.05, and 0.01 g/ml respectively] of methanolic seed extract of Garcinia kola ( Clusiaceae) or bitter kola were tested for ovicidal effect, antifeedance, and repellency against the Colorado potato beetle. Behaviors of the first and third instars, and adults were investigated in dual and no-choice Petri dish experiments, alongside olfactory response to treated leaves in a wind tunnel. The extract was not ovicidal. All three tested stages consumed significantly less from stock-, high-, and medium-dose treated leaves compared to the low-dose and control leaves. The results were consistent for dual-choice and no-choice experiments. Garcinia kola deterrence intensity depended on beetle stage, and exposure time; it remained high (>80%) at stock/high doses, declined swiftly at medium, transient at low, and absent in control. These outcomes support observed feeding attenuation and higher antifeedance at increasing dosage that limit leaf damage to < 10%. The beetles differed in wind-tunnel response, taking a longer time to reach the initial 30-cm observation point for untreated leaves, while treatment effects and odds of reaching the final 50-cm observation point were nonsignificant. Thus, G. kola seed extract has promising short-distance behavior-modifying properties against Colorado potato beetle, and may delay resistance associated with synthetics, while minimizing their attendant deleterious effects on non-target species.
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Claims 5
Claim · model-written summary
The Garcinia kola seed extract was not ovicidal to Colorado potato beetle eggs.
- Taxon
- Solanum tuberosum
Solanum tuberosume1 - Treatment
- methanolic seed extract of Garcinia kolat0
- Interactor
- Leptinotarsa decemlineata
Leptinotarsa decemlineatae1pest - Outcome
- ovicidale2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“methanolic seed extract of Garcinia kola”
e1“Cultivated potato, Solanum tuberosum (Solanaceae), is a key host of the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)”
e2“The extract was not ovicidal”
Claim · model-written summary
All three beetle stages consumed significantly less from stock-, high- and medium-dose treated leaves than from low-dose and control leaves.
- Taxon
- Solanum tuberosumSolanum tuberosume1
- Treatment
- stock-, high-, and medium-dose treated leavese3
- Interactor
- Leptinotarsa decemlineataLeptinotarsa decemlineatae1pest
- Outcome
- consumede3
- Direction
- lesse3
- Qualifier
- consistent for dual-choice and no-choice experimentse4
- Comparator
- low-dose and control leavese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“methanolic seed extract of Garcinia kola”
e1“Cultivated potato, Solanum tuberosum (Solanaceae), is a key host of the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)”
e3“All three tested stages consumed significantly less from stock-, high-, and medium-dose treated leaves compared to the low-dose and control leaves”
e4“The results were consistent for dual-choice and no-choice experiments”
Claim · model-written summary
Deterrence intensity of the Garcinia kola extract was high (>80%) at stock and high doses.
- Taxon
- Solanum tuberosumSolanum tuberosume1
- Treatment
- stock/high dosese5
- Interactor
- Leptinotarsa decemlineataLeptinotarsa decemlineatae1pest
- Outcome
- deterrence intensitye5
- Direction
- highe5
- Value
- >80%e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“methanolic seed extract of Garcinia kola”
e1“Cultivated potato, Solanum tuberosum (Solanaceae), is a key host of the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)”
e5“Garcinia kola deterrence intensity depended on beetle stage, and exposure time; it remained high (>80%) at stock/high doses”
Claim · model-written summary
In the wind tunnel, beetles took a longer time to reach the initial 30-cm observation point with untreated leaves.
- Taxon
- Solanum tuberosumSolanum tuberosume1
- Interactor
- Leptinotarsa decemlineataLeptinotarsa decemlineatae1pest
- Outcome
- time to reach the initial 30-cm observation pointe6
- Direction
- longere6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“methanolic seed extract of Garcinia kola”
e1“Cultivated potato, Solanum tuberosum (Solanaceae), is a key host of the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)”
e6“The beetles differed in wind-tunnel response, taking a longer time to reach the initial 30-cm observation point for untreated leaves”
Claim · model-written summary
Treatment effects on the odds of reaching the final 50-cm observation point in the wind tunnel were not significant.
- Taxon
- Solanum tuberosumSolanum tuberosume1
- Interactor
- Leptinotarsa decemlineataLeptinotarsa decemlineatae1pest
- Outcome
- odds of reaching the final 50-cm observation pointe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“methanolic seed extract of Garcinia kola”
e1“Cultivated potato, Solanum tuberosum (Solanaceae), is a key host of the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)”
e7“while treatment effects and odds of reaching the final 50-cm observation point were nonsignificant”
The same questions in other papers
botanical · Leptinotarsa decemlineata · Solanum tuberosum (potato)Positive and negative results
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See all 20 papers →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.