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Engineering smallholder common bean cropping systems with flowering plants increases hoverfly populations and crop
Yamikani Kaliwo1, Ellen Kumchenga1, Yolice L B Tembo1
1Department of Crop and Soil Sciences, Lilongwe University of Agriculture and Natural Resources, Lilongwe, Malawi.
Frontiers in Insect Science
|March 13, 2026
Summary
Engineering bean crops with flowering plants enhances hoverfly populations, reducing bean aphid damage by 51%. This agroecological approach increases bean yield by up to 42%, offering a sustainable alternative to synthetic pesticides.
Area of Science:
- Agricultural Science
- Entomology
- Ecology
Background:
- Bean aphids significantly impact global bean production, often managed with heavy pesticide use.
- Pesticide reliance diminishes agroecological strategies and harms beneficial insects and biodiversity.
- Habitat loss exacerbates declines in beneficial insects crucial for pest control.
Purpose of the Study:
- To evaluate if enhancing bean crop habitats with flowering plants boosts hoverfly populations.
- To assess the impact of hoverfly enhancement on aphid control and bean yield.
- To compare the efficacy of different flowering plant species in attracting hoverflies.
Main Methods:
- Four flowering plant species (Galinsoga parviflora, Ocimum basilicum, Bidens pilosa, Ageratum conyzoides) were grown around bean crops.
- Hoverfly abundance and aphid infestation levels were monitored in treated and control plots.
- Bean aphid numbers, damage, and crop yield were quantified.
Main Results:
- Bean crops bordered by flowering plants showed a 51% reduction in aphid numbers and damage compared to controls.
- Ocimum basilicum borders resulted in the lowest aphid damage and highest bean yield (917 kg/ha).
- Overall, flowering plant borders increased bean yield by 22-42% (621-917 kg/ha) versus the control (509 kg/ha).
Conclusions:
- Engineering crop habitats with flowering plants effectively enhances hoverfly populations for biological pest control.
- Agroecological practices, like using flowering plant borders, offer a viable alternative to synthetic pesticides in bean production.
- This approach supports biodiversity and sustainable agriculture by reducing reliance on chemical inputs.
