Bridging the gap in agricultural innovation research: a systematic review of push–pull biocontrol technology in sub-Saharan Africa

Biological control for sustainable plant protection in sub-Saharan Africa (SSA) is gaining attention due to low crop productivity caused by pests, increasing costs of agrochemicals, and their harmful impact on health and the environment. A valuable case is the Push–pull technology (PPT) developed by the International Centre of Insect Physiology and Ecology (ICIPE). However, evidence for the success of PPT in reducing pest prevalence has not translated from experimentation and demonstration to wider-scale on-farm uptake. A systematic review was conducted to explore the research gaps, benefits of PPT, adoption determinants, barriers to uptake, and how farmers choose to adopt and adapt the technology. The study found a large body of evidence on the biophysical benefits of PPT, which comes from a relatively narrow set of ICIPE-led or managed experiments in Western Kenya. Besides, evidence of its social and economic benefits is less robust. Documented barriers to adoption include initial establishment costs, labour intensiveness, risk averseness of farmers, socio-cultural rigidity, and inadequate access to information and inputs. The review highlights the need for qualitative research, an in-depth examination of the social dynamics of innovation and decision-making processes on farms, and institutions’ role in shaping innovation for sustainable agricultural development

A Parallel Tabu Search Algorithm for Optimizing Multiobjective VLSI Placement

Abstract. In this paper, we present a parallel tabu search (TS) algorithm for efficient optimization of a constrained multiobjective VLSI standard cell placement problem. The primary purpose is to accelerate TS algorithm to reach near optimal placement solutions for large circuits. The proposed technique employs a candidate list partitioning strategy based on distribution of mutually disjoint set of moves among the slave processes. The implementation is carried out on a dedicated cluster of workstations. Experimental results using ISCAS-85/89 benchmark circuits illustrating quality and speedup trends are presented. A comparison of the obtained results is made with the results of a parallel genetic algorithm (GA) implementation

6G wireless communications networks: a comprehensive survey

The commercial fifth-generation (5G) wireless communications networks have already been deployed with the aim of providing high data rates. However, the rapid growth in the number of smart devices and the emergence of the Internet of Everything (IoE) applications, which require an ultra-reliable and low-latency communication, will result in a substantial burden on the 5G wireless networks. As such, the data rate that could be supplied by 5G networks will unlikely sustain the enormous ongoing data traffic explosion. This has motivated research into continuing to advance the existing wireless networks toward the future generation of cellular systems, known as sixth generation (6G). Therefore, it is essential to provide a prospective vision of the 6G and the key enabling technologies for realizing future networks. To this end, this paper presents a comprehensive review/survey of the future evolution of 6G networks. Specifically, the objective of the paper is to provide a comprehensive review/survey about the key enabling technologies for 6G networks, which include a discussion about the main operation principles of each technology, envisioned potential applications, current state-of-the-art research, and the related technical challenges. Overall, this paper provides useful information for industries and academic researchers and discusses the potentials for opening up new research directions

The population dynamics of and insect-virus interaction

SIGLEAvailable from British Library Document Supply Centre- DSC:DX174057 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Impacts of aphid herbivory on mycorrhizal growth responses across three cultivars of wheat

Societal Impact Statement The Earth's population is projected to rise to 9.7 billion by 2050 resulting in mounting pressure to increase agricultural yields in a sustainable manner. Arbuscular mycorrhizal (AM) fungi may be important players in this agricultural transition given their capacity to improve soil and plant health. Benefits gained by crops hosting AM fungi can be cultivar-specific and also affected by insect herbivory, although the combined effect of these factors remains unclear. Here, we show that, in an economically and socially significant tri-partite system, there is interplay between crop cultivar, AM colonisation and aphid herbivory on plant growth and nutritional status. Summary - Arbuscular mycorrhizal (AM) fungi are critical components of the rhizosphere across nearly all terrestrial biomes. AM fungi associate with most plants, including major crops, usually increasing plant access to soil nutrients and enhancing defence against pests and pathogens in return for photosynthetic carbon (C). However, plant growth responses to AM fungi vary according to species and genotype, an issue pertinent in agro-ecosystems where crop cultivar can play an important role in AM function. Evidence suggests other biotic interactions, including with sap-feeding aphids, impact the function of AM symbioses in plants. Nonetheless, whether these biotic factors alter genotype (or cultivar)-specific plant growth and nutritional responses to colonisation by AM fungi remains unclear. - Here, we investigated whether mycorrhizal responsiveness of three cultivars of wheat (Triticum eastivum L.) to colonisation by a ubiquitously occurring AM fungus (Rhizophagus irregularis) differ in the presence or absence of bird cherry-oat aphids (Rhopalosiphum padi), a major pest of cereals. - Our findings show that although AM fungal colonisation and AM-mediated plant growth responses were not affected by aphid feeding, there was variation between cultivars in the benefits gained by host plants in terms of nutrient acquisition and root growth, while aphid abundances also differed between wheat varieties. - Understanding what causes cultivar-specific outcomes and how they ultimately impact plant growth promotion, crop yields and food production represent key future research goals in agroecology

Who must adapt to whom? Contested discourses on human–wolf coexistence and their impact on policy in Spain

1. Emerging nature restoration agendas are increasing the pressure on rural communities to coexist with expanding wildlife, including large carnivores. There are different interpretations of coexistence, stemming from divergent ways of conceptualising and relating to nature. Yet there is limited understanding of how and why certain interpretations become dominant, and how this influences conservation policy and practice. 2.This question is highly relevant for the management of wolves in Spain. Until recently, the national strategy allowed certain regional autonomy in creating and enacting coexistence policy, including through culling and sport hunting. However, in 2021, the national government declared wolves strictly protected throughout the country, despite strong contestations about whether and why it was necessary. 3.We studied the discursive processes that co-produced this policy shift. First, we explored interpretations among communities that share, or will share, space with wolves, using qualitative field data. Second, we triangulated local interpretations with framings in public media to identify prominent discourses about coexistence. Third, we traced how these discourses interacted with Spanish conservation policy: who was heard and why. 4.We highlight three prominent discourses: wolf protectionism, traditionalism and pragmatism, each proposing a distinct pathway to coexistence with wolves. Through our policy analysis, we illuminate a dominance of protectionism within national politics, which justified a centralised technocratic pathway while downplaying place-based approaches. The resulting coexistence policy was highly contested and appears to have increased social conflict over wolves. 5.Our findings reveal knowledge hierarchies within Spanish policy frameworks that promotes ‘mainstream’ conservationists' narrow interpretation of what nature and coexistence should be. This has perpetuated an apolitical approach that is focussed on mediating direct impacts from wolves, rather than conflicting worldviews, and that undermines efforts to promote dialogue and local stewardship. While our research is centred on Spain, the findings are of broad relevance since they reveal structural barriers that constrain the incorporation of diverse knowledge systems into conservation policy, and subsequent transformations towards socially just and locally adapted coexistence programmes