Projects per year
Assessing effects of climate change on agricultural systems and the potential for ecological intensification to increase food security in developing countries is essential to guide management, policy-making and future research. ‘Push-pull’ technology (PPT) is a poly-cropping design developed in eastern Africa that utilizes plant chemicals to mediate plant–insect interactions. PPT application yields significant increases in crop productivity, by reducing pest load and damage caused by arthropods and parasitic weeds, while also bolstering soil fertility. As climate change effects may be species- and/or context-specific, there is need to elucidate how, in interaction with biotic factors, projected climate conditions are likely to influence future functioning of PPT. Here, we first reviewed how changes in temperature, precipitation and atmospheric CO2 concentration can influence PPT components (i.e., land use, soils, crops, weeds, diseases, pests and their natural enemies) across sub-Saharan Africa (SSA). We then imposed these anticipated responses on a landscape-scale qualitative mathematical model of maize production under PPT in eastern Africa, to predict cumulative, structure-mediated impacts of climate change on maize yield. Our review suggests variable impacts of climate change on PPT components in SSA by the end of the 21st century, including reduced soil fertility, increased weed and arthropod pest pressure and increased prevalence of crop diseases, but also increased biological control by pests’ natural enemies. Extrapolating empirical evidence of climate effects to predict responses to projected climate conditions is mainly limited by a lack of mechanistic understanding regarding single and interactive effects of climate variables on PPT components. Model predictions of maize yield responses to anticipated impacts of climate change in eastern Africa suggest predominantly negative future trends. Nevertheless, maize yields can be sustained or increased by favourable changes in system components with less certain future behaviour, including higher PPT adoption, preservation of field edge density and agricultural diversification beyond cereal crops.
Bibliographical noteFunding Information:
We thank Shem Kuyah and Zeyaur R. Khan for sharing their knowledge of the push-pull system. Mattias Jonsson (MJ) is grateful for support from SLU Centre for Biological Control. We thank the editor and two anonymous reviewers for their constructive comments. This work was supported by the Swedish Research Council Vetenskapsrådet [grant number 2018-05843 to MJ], and received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 861998 (UPSCALE project).
© 2023 The Authors
Subject classification (UKÄ)
- Climate Research
- Other Agricultural Sciences
- Climate change
- Natural pest control
- Qualitative model
- Sub-Saharan Africa
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UPSCALE: Upscaling the benefits of push-pull technology for sustainable agricultural intensification in East Africa
2020/11/01 → 2025/10/31
Towards sustainable maize production in East Africa: Cropping system resilience under climate change
2019/01/01 → 2022/12/31