Abstract
Abstract The exogenous application of natural plant defense elicitors represents a promising strategy for alternative pest management. Such treatments enhance plant resistance to herbivores and influences interactions with natural enemies. Methyl jasmonate (MeJA), a key signaling molecule, is known to trigger plant defense mechanisms. In this study, the effects of MeJA on pest and predator populations associated with common bean were evaluated in field experiments conducted in Bolu, Türkiye in 2024 and 2025 using a randomized complete block design, where plants were treated with four MeJA doses (0.5, 1.5, 2.5, and 3.5 mM) at two plant growth stages. Insect populations were monitored weekly using sticky traps, visual inspection, and sweep-net sampling. A total of 14 insect species were recorded including five pests and nine predators. Generalized linear mixed model analysis revealed significant effects of MeJA dose and plant growth stage on pest abundances. The 3.5 mM MeJA dose significantly reduced the abundance of sucking pests across both 2024 and 2025 compared to the control group. In 2024, the strongest reductions were observed in apterous aphid populations (57.3%) and Empoasca decipiens Paoli (Hemiptera: Cicadellidae) (35.5%), followed by Thrips tabaci Lindeman (Thysanoptera: Thripidae) (27.0%) and alate aphids (26.1%). In 2025, the suppressive effects were generally more pronounced, with reductions reaching 68.5% in apterous aphids and 62.3% in T. tabaci , alongside significant decreases in alate aphids 50.9% and E. decipiens (47.8%). Additionally, MeJA had a positive influence on predator abundance. Syrphid and coccinellid numbers were significantly higher at the 3.5 mM dose across the entire sampling period, with Coccinellid abundances increasing 3.62-fold in 2024 and 3.17-fold in 2025, and Syrphid abundances increasing 1.66-fold in 2024 and 3.20-fold in 2025 compared to the control group. Chrysoperla carnea Stephens (Neuroptera: Chrysopidae) populations were not affected by MeJA concentration. Overall, these findings demonstrate the deterrent effects of MeJA-treated common bean plants on sucking insect pests while enhancing certain predator abundances, emphasizing their potential as a sustainable tool in integrated pest management.
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Claims 10
Claim · model-written summary
The 3.5 mM MeJA dose significantly reduced sucking pest abundance on common bean compared with the control group.
- Taxon
- common bean
Phaseolus vulgarist0 - Treatment
- 3.5 mM MeJA dosee2
- Interactor
- sucking pestse2pest
- Outcome
- abundance of sucking pestse2
- Direction
- reducede2
- Comparator
- control groupe2
- Setting
- Bolu, Türkiyee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“common bean”
e2“The 3.5 mM MeJA dose significantly reduced the abundance of sucking pests across both 2024 and 2025 compared to the control group”
e0“field experiments conducted in Bolu, Türkiye in 2024 and 2025”
Claim · model-written summary
In 2024 the 3.5 mM MeJA dose gave the strongest reduction in apterous aphid populations, 57.3%.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- 3.5 mM MeJA dosee2
- Interactor
- apterous aphide3pest
- Outcome
- apterous aphid populationse3
- Direction
- reductionse3
- Value
- 57.3%e3
- Comparator
- control groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“common bean”
e2“The 3.5 mM MeJA dose significantly reduced the abundance of sucking pests across both 2024 and 2025 compared to the control group”
e3“In 2024, the strongest reductions were observed in apterous aphid populations (57.3%)”
Claim · model-written summary
In 2024 the 3.5 mM MeJA dose reduced Empoasca decipiens by 35.5%.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- 3.5 mM MeJA dosee2
- Interactor
- Empoasca decipiens PaoliHebata decipiense4pest
- Outcome
- Empoasca decipiens Paoli (Hemiptera: Cicadellidae)e4
- Direction
- reductionse3
- Value
- 35.5%e4
- Comparator
- control groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“common bean”
e2“The 3.5 mM MeJA dose significantly reduced the abundance of sucking pests across both 2024 and 2025 compared to the control group”
e3“In 2024, the strongest reductions were observed”
e4“Empoasca decipiens Paoli (Hemiptera: Cicadellidae) (35.5%)”
Claim · model-written summary
In 2024 the 3.5 mM MeJA dose reduced Thrips tabaci by 27.0%.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- 3.5 mM MeJA dosee2
- Interactor
- Thrips tabaci Lindeman
Thrips tabacie4pest - Outcome
- Thrips tabaci Lindeman (Thysanoptera: Thripidae)e4
- Direction
- reductionse3
- Value
- 27.0%e4
- Comparator
- control groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“common bean”
e2“The 3.5 mM MeJA dose significantly reduced the abundance of sucking pests across both 2024 and 2025 compared to the control group”
e3“In 2024, the strongest reductions were observed”
e4“followed by Thrips tabaci Lindeman (Thysanoptera: Thripidae) (27.0%)”
Claim · model-written summary
In 2024 the 3.5 mM MeJA dose reduced alate aphids by 26.1%.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- 3.5 mM MeJA dosee2
- Interactor
- alate aphidse4pest
- Outcome
- alate aphidse4
- Direction
- reductionse3
- Value
- 26.1%e4
- Comparator
- control groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“common bean”
e2“The 3.5 mM MeJA dose significantly reduced the abundance of sucking pests across both 2024 and 2025 compared to the control group”
e3“In 2024, the strongest reductions were observed”
e4“followed by Thrips tabaci Lindeman (Thysanoptera: Thripidae) (27.0%) and alate aphids (26.1%)”
Claim · model-written summary
In 2025 the 3.5 mM MeJA dose reduced apterous aphids by 68.5%.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- 3.5 mM MeJA dosee2
- Interactor
- apterous aphidse5pest
- Outcome
- apterous aphidse5
- Direction
- reductionse5
- Value
- 68.5%e5
- Comparator
- control groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“common bean”
e2“The 3.5 mM MeJA dose significantly reduced the abundance of sucking pests across both 2024 and 2025 compared to the control group”
e5“In 2025, the suppressive effects were generally more pronounced, with reductions reaching 68.5% in apterous aphids and 62.3% in T. tabaci”
Claim · model-written summary
In 2025 the 3.5 mM MeJA dose reduced Thrips tabaci by 62.3%.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- 3.5 mM MeJA dosee2
- Interactor
- T. tabaciThrips tabacie5pest
- Outcome
- T. tabacie5
- Direction
- reductionse5
- Value
- 62.3%e5
- Comparator
- control groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“common bean”
e2“The 3.5 mM MeJA dose significantly reduced the abundance of sucking pests across both 2024 and 2025 compared to the control group”
e5“In 2025, the suppressive effects were generally more pronounced, with reductions reaching 68.5% in apterous aphids and 62.3% in T. tabaci”
Claim · model-written summary
In 2025 the 3.5 mM MeJA dose significantly decreased alate aphids by 50.9%.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- 3.5 mM MeJA dosee2
- Interactor
- alate aphidse6pest
- Outcome
- alate aphidse6
- Direction
- decreasese6
- Value
- 50.9%e6
- Comparator
- control groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“common bean”
e2“The 3.5 mM MeJA dose significantly reduced the abundance of sucking pests across both 2024 and 2025 compared to the control group”
e6“significant decreases in alate aphids 50.9% and E. decipiens (47.8%)”
Claim · model-written summary
In 2025 the 3.5 mM MeJA dose significantly decreased Empoasca decipiens by 47.8%.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- 3.5 mM MeJA dosee2
- Interactor
- E. decipiensHebata decipiense6pest
- Outcome
- E. decipiense6
- Direction
- decreasese6
- Value
- 47.8%e6
- Comparator
- control groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“common bean”
e2“The 3.5 mM MeJA dose significantly reduced the abundance of sucking pests across both 2024 and 2025 compared to the control group”
e6“significant decreases in alate aphids 50.9% and E. decipiens (47.8%)”
Claim · model-written summary
Chrysoperla carnea populations were not affected by MeJA concentration.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- MeJA concentratione1
- Interactor
- Chrysoperla carnea Stephens
_Chrysoperla_carnea_-_dorsal_view.jpg?width=60)
Chrysoperla carneae1biocontrol_agent - Outcome
- populationse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Chrysoperla_carnea_-_dorsal_view.jpg?width=500)
Verbatim
t0“common bean”
e1“Chrysoperla carnea Stephens (Neuroptera: Chrysopidae) populations were not affected by MeJA concentration”
The same questions in other papers
(-)-methyl jasmonate · pest · Phaseolus vulgaris (common bean)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.