Abstract
Vernonia amygdalina Delile (Asteraceae), commonly known as bitter leaf, is a tropical shrub that may potentially serve as a biopesticide against the Colorado potato beetle Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae), a key pest of potatoes. The beetle’s behavioral response to the methanolic leaf extract of V. amygdalina was evaluated in this study. Using no-choice, dual-choice, and wind-tunnel assays under laboratory conditions, we evaluated responses of larvae and adults to potato leaf discs treated with V. amygdalina extract in a randomized complete block design, measuring feeding behavior, leaf damage levels, and remaining leaf area. The results showed that V. amygdalina had no biocidal effects against the beetle, as no mortality was incurred. However, dose-linked antifeedant effects were evident in both no-choice and dual-choice arenas. Vernonia amygdalina minimized leaf-area loss most effectively at the highest concentration, especially against the larvae. The extract showed no olfactory repellency but acted as an antifeedant, possibly through contact or taste (gustatory) receptors. The consistent behavioral avoidance at higher concentrations suggests that V. amygdalina acts as a form of deterrent against the Colorado potato beetle.
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Claims 4
Claim · model-written summary
The extract caused no beetle mortality.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- V. amygdalinae0
- Interactor
- beetlee0pest
- Outcome
- beetle, as no mortality was incurrede0
- Direction
- no mortalitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“V. amygdalina had no biocidal effects against the beetle, as no mortality was incurred”
t0“Cultivated Potato”
Claim · model-written summary
The extract produced dose-linked antifeedant effects in no-choice and dual-choice arenas.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- dose-linkede0
- Interactor
- Colorado Potato Beetle
Leptinotarsa decemlineatat0pest - Outcome
- antifeedant effectse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dose-linked antifeedant effects were evident in both no-choice and dual-choice arenas”
t0“Colorado Potato Beetle—A Key Pest of Cultivated Potato”
Claim · model-written summary
The highest extract concentration best minimized potato leaf-area loss, especially against larvae.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- Vernonia amygdalinae0
- Interactor
- Colorado Potato BeetleLeptinotarsa decemlineatat0pest
- Outcome
- leaf-area losse0
- Direction
- minimizede0
- Qualifier
- at the highest concentration, especially against the larvaee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vernonia amygdalina minimized leaf-area loss most effectively at the highest concentration, especially against the larvae”
t0“Colorado Potato Beetle—A Key Pest of Cultivated Potato”
Claim · model-written summary
The extract showed no olfactory repellency.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- The extracte0
- Interactor
- Colorado Potato BeetleLeptinotarsa decemlineatat0pest
- Outcome
- olfactory repellencye0
- Direction
- noe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extract showed no olfactory repellency”
t0“Colorado Potato Beetle—A Key Pest of Cultivated Potato”
The same questions in other papers
botanical · Leptinotarsa decemlineata · Solanum tuberosum (potato)Positive and negative results
4 papers in the same direction as this paper · 15 in the opposite direction
- positive
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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.